[Q] Considering rooting 10.1 but... - Galaxy Tab 10.1 General

I have never rooted any of my Android devices because I've never really had any reason to. That and I was always nervous to do with my Droid Incredible even though I'm a computer guy.
However, I am considering rooting for this device because of some benefits I've read about such as:
1. Overclocking
2. Better battery life
3. Additional apps or functionality (I want to use Google Movies, Netflix, Hulu Plus, etc and I am guessing root might help get some of this sooner based on some of the other threads)
My concern is whether overclocking has any risk to the processor long term in the tab? For some reason, I seem to have something in my head from years back that overclocking computers/devices could cause processors to overheat or something. Maybe this is an old concern from when I was in college that was specific to PC hardware?
Also, aside from sticky threads, is there any thing on the wiki that talks a bit more about some of the apps used to manage ROMs and backups along with what is preferred and why? I read a good rooting guide thread in Android development forum but apps change all the time and I read different things in each thread that it can be hard to follow jumping in now.
If I missed a thread, feel free to point me to it.
Thanks.

Overclock always carries risks to hardware, especially without proper configuration. When overclocking you will use apps such as SetCPU or others, these apps typically have 'profiles' set up. On my LG G2x I have profiles set like:
Default 1.5GHz
Screen Off 400mhz
Battery Tempurate 48c Downclock to 800mhz
These settings will give you great performance, great battery life and a safety net assuming you leave your phone in direct heat. Sometimes if the battery gets too hot you'll damage your hardware, I've had this happen to my old Nexus One where I now have a very dark spot measuring about half an inch around on my display.
In consideration to rooted apps for Galaxy Tab... Hulu works without root by simply installing a modified Adobe Flash Player and adjusting your browser configuration to reflect a desktop user agent (You can easily find all this information using Google). Google Movies probably won't be available to rooted devices due to the agreement that Google signed with production companies, and whether root will allow you to run this application really depends on the way the content is delivered, however, I'm sure someone will figure it out.
Overclocking the Galaxy Tab probably will resemble the performance measures of other Tegra based devices. G2x can acheive 1.5GHz and Xoom 1.7GHz. Stability is really hit or miss as no two cpu's are created equal. I'm on my third Galaxy Tab and my third G2x and have not ran into an issue where I can't overclock to the speeds which kernel developers are building.
Edit: There is really only one overclock kernel available right now for the 10.1 and Pershoot is working hard to make it stable and powerful, the current 'preview' has quite a few stability issues.
So, hopefully this helps you out. Just an FYI though, really try and search. This has been repeated hundreds of times throughout various different forums. The general consensus is that rooting provides far too many benefits to be afraid of hurting your device, and so long as your are able to A. Unroot the phone for manufacture warranty B. Backup and restore using Nandroid, you will not have any issues that can't be resolved.

Heat is bad for electronics, and any time you increase the operating frequency or voltage of a microprocessor, you're going to be generating more heat. Modern hardware has thermal monitoring and throttling capabilities, and as such you're going to be able to simply fry your processor by pushing it too hard. However the additional stress is is accumulative and will shorten the life of your hardware.
That being said, I suspect that the operational life time of the chips in our tablets (and virtually any modern computer) is several orders of magnitude longer than their useful life time. I'm not entirely sure how long these processors last if operated at spec (it may be in a white paper somewhere), but I suspect it is on the order of many decades, if not centuries.

mesasone, true it will generate heat at full load but in all reality my G2x rarely throttles all the way up to 1.5GHz unless I manual set it to for benchmarking.

Thanks wesbalmer and mesasone. I've been reading threads all day for the last 6 hrs before posting but I'll search a bit more next time. This was helpful in reassuring me though.

Related

[Q] Heat...?

I am beginning to suspect that there may be a simple reason 'some' N7's are having crash issues with custom kernels/ROMs. I have a small temperature & CPO widget, and also use Sense Analog Clock w/system data, and I have been paying attention to - temperature. FULL DISCLOSURE: I use a case that is very solid and enclosing, as I travel a lot and want my N7 protected well, and that may be keeping some additional heat in via insulation.
In any event, I notice that the N7 starts out at about 79.5F, but with even moderate use, is over 85F. I use mine mostly for reading news and books, I don't play games on it, and only review the occasional youtube news video. Could the 'culprit' be simply overheating?
It would be interesting to have some small app that would record CPU, GPU & memory use, temperature, and 'crash' information - we might be able to get to the 'bottom' of the sporadic freezes/crashes that some are experiencing.
Will cross post this in a couple of places. jf
friedsonjm said:
I am beginning to suspect that there may be a simple reason 'some' N7's are having crash issues with custom kernels/ROMs. I have a small temperature & CPO widget, and also use Sense Analog Clock w/system data, and I have been paying attention to - temperature. FULL DISCLOSURE: I use a case that is very solid and enclosing, as I travel a lot and want my N7 protected well, and that may be keeping some additional heat in via insulation.
In any event, I notice that the N7 starts out at about 79.5F, but with even moderate use, is over 85F. I use mine mostly for reading news and books, I don't play games on it, and only review the occasional youtube news video. Could the 'culprit' be simply overheating?
It would be interesting to have some small app that would record CPU, GPU & memory use, temperature, and 'crash' information - we might be able to get to the 'bottom' of the sporadic freezes/crashes that some are experiencing.
Will cross post this in a couple of places. jf
Click to expand...
Click to collapse
Desktop CPUs generally will run up to 85C, which is 185F. I suspect mobile CPUs are not specced nearly that high, but you have nothing to worry about there.
Are there variations, issues, solder problems? Sure, any of that could happen, and be exposed under various thermal stresses. But 85f is nothing to be concerned about.
khaytsus said:
Desktop CPUs generally will run up to 85C, which is 185F. I suspect mobile CPUs are not specced nearly that high, but you have nothing to worry about there.
Are there variations, issues, solder problems? Sure, any of that could happen, and be exposed under various thermal stresses. But 85f is nothing to be concerned about.
Click to expand...
Click to collapse
Agreed... but I'm getting that on light usage - I wonder what the game players are getting.. and if heat is causing a lot of the problems being reported on the N7 on XDA...

[Q] N10: Crippled Exynos 5?

I bought a Nexus 7 to use it as an ebook reader and I'm plenty satisfied in that regard. I soon discovered that I can do plenty of other interesting things with it so I rooted it mainly to install the Sixaxis app. My main point of interest is with emulators. I've bought every decent emulator available in the Google Play store (see the screenshot ). Soon, I saw the limits of the N7: small screen and average CPU/GPU performance.
So, I started looking for another 10 inches Android tablet and, until yesterday, it was to be a Nexus 10 (when available). But, after reading a lot of complains about the Exynos 5 in the N10 being throttled, I wonder if this tablet is really the best choice in term of available CPU / GPU performance. If only a fraction of the Exynos 5 power is available due to thermal constraints or if it gets throttled a lot, maybe the N10 isn't the best tablet out there for gaming and emulation...
I know that I could flash another ROM and start fiddling with the CPU parameters but I don't like that idea. I'm worried about battery life, overheating and all the troubles you get when you want to update to a newer version of Android after you switched ROMs. Overclocking is not something I want to do either. I would like to stay with the stock ROM. Are my concerns about changing ROMs valid? I may change my mind about this though, if it's the best solution and there is no danger of damaging my N10.
So, my questions are: is the N10 a good choice for emulation and for gaming? Is there other 10 inches tablets that would fill the bill better? Should I think about ROM replacement and/or tweaking instead and stay with the N10? I started checking the Galaxy Tab 10.1 and it doesn't compare very well to the N10 (price, specs, screen). Also, there is the Tegra4 pointing at the horizon...
Edit:
I'll probably go for the N10 when it will be available. I'm reading the AOKP ROM thread and it sounds like the dev has nailed most of my concerns. Here's the link of the thread:
http://forum.xda-developers.com/showthread.php?t=2095222
And here's a nice video showing it:
http://www.youtube.com/watch?v=VNxdhF-nvec
Thanks for the video link.

Ben Williams' Note 8.0 experience thread

I thought I'd start a thread to talk about my research in to this tablet and the conclusions and decisions i have taken in choosing it, setting it up and the mods i choose to incorporate or leave out. Dont know if it will help other people in choosing to buy one of these or not or if it will help others into expanding the capabilities of their stock unit, but I appreciate the feedback I've been getting on the individual threads I've been looking at.
Why I chose the Note 8.0
Since tablets first started becoming mass market items, I always had a problem with the 10 inch format that is most popular. I myself own a 10 inch tablet (an ASUS Transformer) and while I enjoy using it at home, I find it too bulky to take out with me yet too small to replace my laptop for any serious tasks. Having played with many tablets in stores over the years I soon decided that the 8-9inch form factor was one that was most ideal. 7inches was too small and too close to a mobile phone for my liking. Going up 1 inch adds about 25% more screen real estate and this is significant for me. Saying that, I never found a tablet in that size range that was up to standard in terms of tech spec. They always seems over priced, underpowered or were missing an important feature for my liking. The original note phone came out. I loved the idea and benefit that the spen brought to the table but thought it was too small to be useful for any serious input.
On an average day I will carry a camera, my phone, a note pad, my 10 inch tablet and sometimes a sketchbook as well. While I feel the 8.0 is a little overpriced (not alot overpriced like many reviews seem to lable it) the benefit of the spen allows me to ditch the notepad and sketchbook as well as the 10 inch tablet. This is huge for me as although the other items arent heavy, a whole day carrying my bag can start to take its toll on my shoulder.
Initial thoughts
My tablet arrived in my hands late last night so I havent had much time to spend with it. I love the responsiveness of the spen although I'm not used to the pressure sensitivity of it yet for drawing applications.
I'm a little overwhelmed by the additional apps, functions and settings added to the OS by Samsung at the moment. There seems to be a lot to go through and at least a few things that I have no use of. After I've spent a few days with it, I will talk about what I have enabled and disabled and why but in the mean time I expect to start at least one thread asking a few questions.
Waiting on my microSD card to arrive before I attempt to root it.
A few days in
Rooted the tablet using the method in the link in the mods section bellow. The process was smooth although I no longer am able to access Readers Huib as it displays "Rooting detected"
Installed SetCPU, Trickster, Greenify and FolderMount.
Installed 18GB of games with the assistance of my 64GB microSD and FolderMount.
Set 2 underclocking profiles using setCPU (screen off and battery <= 15%). Dont think ill overclock (at least not at the moment anyway) as everything seems to be running smooth as it is.
Set a few apps to hibernate with Greenify but will build up the list as i notice more apps unncessarily running in the background.
Not really sure if ill get much use out of Trickster yet.
Not had any issues with battery life, but I tend to disable anything I dont need at the time. went the whole weekend with out needing to charge with my current set up and regular use.
Will put up pictures to show my set up when I'm next home and remember (I mostly use forums at work...).
A few weeks in
Had a bit of an extended play now and can report back some more information. I havent used it for drawing as much as I had intended so far as i've been getting carried away with the amount of games that I can store on the device. The overall experience has been extremely positive. I have found that ive not really used the "S series" apps at all. I have S calendar on there but think i preffer google callender. I've been using Awesome note to take most of my notes although I havent figured out how to sync it with evernote yet. Thats the main reason I'm using that app. Im using LayerPaint as my main drawing app. So im only using S note when Im really in a hurry and need to jot something down.
For gaming I'm finding it a pleasure to use. The screen is extremely responsive and i have had little in the way of stuttering issues. The one thing I will say is that a section of the screen gets uncomfortably warm when playing a CPU/GPU intensive game. The CPU shows a temp of 40 degrees but the screen feels warmer than that making me think it may be the GPU thats getting hot. I've not had the chance to explore this further, but it is putting my off wanting to overclock them.
The GPS signal is great and im finding having an 8 inch satnav (with navfree) a really good companion in the car. The battery life is draining about about 20% per hour as a rough estimate through my initial tests with it. volume 60%. screen 60%. GPS on. All other conections off. Power saving mode enabled (not sure this makes much difference for me. Set CPU locks the CPU at my preffered settings, so this is just reducing the refresh rate and lowing the brightness slightly).
A month in
Switched from setCPU to TricksterMod. Although you cant set up specific scenarios with it, there are guvernors that do what I intended with scenarios anyway (luzactiveQ limits the CPU when the screen is off). I overclocked and undervolted both the GPU and CPU and have been pretty stable on my current settings (in the summary section bellow). It seems to be running cooler now as well and I'm no longer getting a hot patch on the left hand side of the screen. Got a new case based on the recomendations on this forum and a few more apps. Art Flow - recommend, although I'm still stuck on LayerPaint. Reviewing a few art reference apps I noticed on FaeMinx's post your homescreen post.
Accessories
Case
I decided to try a cheap case to start me off. Reported issues with magnetized cases on older notes has me spooked (see this thread http://forum.xda-developers.com/showthread.php?t=2288809). I liked the idea of the "Hidden Note" (http://forum.xda-developers.com/showthread.php?t=2254176) but I think its a little overkill for me.
I'm starting off with this http://www.amazon.co.uk/Mulbess-Lea...TF8&colid=2SV9ALFBCBWRE&coliid=I21F5LS9DX0EES cheap and cheerful, plus the slight lip on the bezel it has will help prevent me accidentally triggering the capacitve buttons on the bottom of the tablet while holding it in landscape. This seems to be working. There are magnets in place to hold it closed. Im not sure how I feel about this...
Now got the Poetic Revolution case. Its a little pricey but not compared to the official one, but it does everything i wanted in a case. http://forum.xda-developers.com/showthread.php?t=2311243
Additional Spen
Bought the 8pi pen a few weeks ago once I had decided I wanted a note. It works very well with the tablet from my initial tests. I plan on doing a lot of digital art on this device.
Want to get a few days of usage under my belt before I decide if I want to do this or not though http://phandroid.com/2012/12/05/how-to-adjust-s-pen/ (adjust spen sensitivity)
microSD card
Due to the small amount of internal storage i decided a large microSD card is a must and will use an app or combination of apps to either move apps or app data onto it to allow me to install more than would otherwise be avialable. Ordered a Scandisk 64GB class 10 card.
Screen Protector.
Currently undecided whether I will use one or not. The case I have should keep the screen protected in transit and I cant see myself doing any damage to it with the sylus. The Revolution comes with a screen protector built in. If it starts to annoy me, I'll just pop it out.
Car Mount.
As this device has GPS I figure I'll take full advantage and use it as my Satnav (Nav Free) / in car entertainment system. http://www.amazon.co.uk/gp/product/B00BXFLYTW/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1
Mods
Root - A must for me to be able to take advantage of the microSD card. used this method http://forum.xda-developers.com/showthread.php?t=2251033 was a smooth process.
ROM - undecided. waiting to try out touchwiz to see if I like its features and to see what I can disable / uninstall if necesary to boost performance if i find a feature of no benefit
Kernel - Flashed Civs kernal. http://forum.xda-developers.com/showthread.php?t=2272917 Really pleased with it. allowed me to both undervolt and overclock the CPU and GPU and not had any performance issues.
CPU
100 - 1704
lulzactiveq (a modified interactive but also with the benefit of limiting the cpu when the screen is off). also set ignore_nice_load to 1. so that nice to have processes are now no longer run. only the higher priority ones are.
row
uv -75
GPU settings on
160 - 837500
350 - 912500
440 - 962500
533 - 1025000
1 up - 90
2 down - 41
2 up - 90
3 down - 70
3 up - 90
4 down - 73
System Apps
Trickster - Was using setCPU but foudn the additional functionality of Trickster to be useful. Specificy with the GPU tweeks.
FolderMount - I dont want to swap the internal and external memory as I plan on still being able to hot swap SD cards if I wish to review some of the photos I've take. I hope that by only moving the app data and not the app itself, I should have no issues doing this.
Auto Airoplane Mode - switches all connections off when the screen is off
Greenify - identify apps that open in the background looking for updates and dissabling that ability in order to preserve battery. I only want some apps to update if I open them.
Other Useful Apps
Titanium Backup
ES File Explorer
DiskUsage - true view of storage space in a easily understood layout. Helps identify wasted space and erase unused files.
Apps for use with Stylus (creative)
Sketchbook Pro - still learning how to use this
LayerPaint - simple lay out, but powerful tool. My favourite at the moment. The fadein/out pen is especially good for line art.
ArtFlow - relatively new app, but good support and growing features.
Lecture Notes - Better than S Note according to sources on here. Not tried it yet
Art reference tools
Handy
Pose Tool
All comments, feedback and suggestions welcome. I've had some great feed back so far on here but would like to have my entire set up in one thread so that people can make advice for me in complete context. Any performace enhancing or battery saving tips appreciated.
Special thanks to @FaeMinx for your general art app help and discussion and @civato for your general support to the comunity. Others have been helpful as well and hopefully I've clicked thanks where appropriate, but these two have been particularly helpful to me.
thank you
Thank you for your comprehensive note.
Please report here any eventual experience with an alternative ROM.
I'm not a Note 8 owner yet, waiting for a 32GB 3G version.
hertsjoatmon said:
I thought I'd start a thread to talk about my research in to this tablet and the conclusions and decisions i have taken in choosing it, setting it up and the mods i choose to incorporate or leave out. Dont know if it will help other people in choosing to buy one of these or not or if it will help others into expanding the capabilities of their stock unit, but I appreciate the feedback I've been getting on the individual threads I've been looking at.
Why I chose the Note 8.0
Since tablets first started becoming mass market items, I always had a problem with the 10 inch format that is most popular. I myself own a 10 inch tablet (an ASUS Transformer) and while I enjoy using it at home, I find it too bulky to take out with me yet too small to replace my laptop for any serious tasks. Having played with many tablets in stores over the years I soon decided that the 8-9inch form factor was one that was most ideal. 7inches was too small and too close to a mobile phone for my liking. Going up 1 inch adds about 25% more screen real estate and this is significant for me. Saying that, I never found a tablet in that size range that was up to standard in terms of tech spec. They always seems over priced, underpowered or were missing an important feature for my liking. The original note phone came out. I loved the idea and benefit that the spen brought to the table but thought it was too small to be useful for any serious input.
On an average day I will carry a camera, my phone, a note pad, my 10 inch tablet and sometimes a sketchbook as well. While I feel the 8.0 is a little overpriced (not alot overpriced like many reviews seem to lable it) the benefit of the spen allows me to ditch the notepad and sketchbook as well as the 10 inch tablet. This is huge for me as although the other items arent heavy, a whole day carrying my bag can start to take its toll on my shoulder.
So. Here I am, about to receive my new tablet this weekend and very excited to do so. I would have bought one sooner, but I was waiting for news of a higher capacity device but according to Samsung Westfield and Samsung Customer Support that is unlikely to arrive anytime soon.
Accessories
Case
I decided to try a cheap case to start me off. Reported issues with magnetized cases on older notes has me spooked (see this thread http://forum.xda-developers.com/showthread.php?t=2288809). I liked the idea of the "Hidden Note" (http://forum.xda-developers.com/showthread.php?t=2254176) but I think its a little overkill for me.
I'm starting off with this http://www.amazon.co.uk/Mulbess-Lea...TF8&colid=2SV9ALFBCBWRE&coliid=I21F5LS9DX0EES cheap and cheerful, plus im hoping the slight lip on the bezel it has will help prevent me accidentally triggering the capacitve buttons on the bottom of the tablet while holding it in landscape. Will report back my experience.
Additional Spen
Bought the 8pi pen a few weeks ago once I had decided I wanted a note. I tried it will my girlfriends original note and it felt nice in my hands. I plan on doing a lot of digital art on this device.
microSD card
Due to the small amount of internal storage i decided a large microSD card is a must and will use an app or combination of apps to either move apps or app data onto it to allow me to install more than would otherwise be avialable. Ordered a Scandisk 64GB class 10 card.
Screen Protector.
Currently undecided whether I will use one or not. The case I have should keep the screen protected in transit and I cant see myself doing any damage to it with the sylus.
Car Mount.
As this device has GPS I figure I'll take full advantage and use it as my Satnav (Nav Free) / in car entertainment system.
Mods
Root - A must for me to be able to take advantage of the microSD card
ROM - undecided. waiting to try out touchwiz to see if I like its features and to see what I can disable / uninstall if necesary to boost performance if i find a feature of no benefit (Peel Remote?, Multi-Windows?, spen on pull ou?t, touchdown push?)
Kernel - Will be flashing a custom kernel. I plan on overclocking the CPU slightly but will also be looking to do the same with the GPU as if it is like the S3 it can be pushed a little harder with out upping the voltage.
System Apps
SetCPU - will overclock slightly but also set it to underclock when the battery is getting low and when the screen is off.
FolderMount or link2SD - I dont want to swap the internal and external memory as I plan on still being able to hot swap SD cards if I wish to review some of the photos I've take. I hope that by only moving the app data and not the app itself, I should have no issues doing this.
That will do for now. I better get back to work. Been typing this for a while now. Will talk about about what theming I plan on doing and some of the other apps I intend on using. Wont bother talking about games or anything like that though.
All comments, feedback and suggestions welcome. I've had some great feed back so far on here but would like to have my entire set up in one thread so that people can make advice for me in complete context. Any performace enhancing or battery saving tips appreciated.
Click to expand...
Click to collapse
lautunno said:
I'm not a Note 8 owner yet, waiting for a 32GB 3G version.
Click to expand...
Click to collapse
You may be waiting a while... As I stated in my post, according to both the official store and the online customer service there is no current planned release date for a 32gb model (at least not here in the UK). They say that the demand isnt there (which is a joke in my opinion). Having been told this I decided to go down the "transfer app data to microSD" route.
Honestly, peel is useful to me solely for turning on the television. It's painfully slow to send commands like channel selection to the set.
Multiwindow is very valuable. Comparing things to instructions (ie, have root explorer and a browser open simultaneously to look at files; have a browser and a terminal emulator open simultaneously to read commands in the browser and issue them correctly without swapping between apps.)
I don't know if the multiwindow app in Play supports non-touchwiz roms, but at this point the alternate roms are still touchwiz based, afaik.
Civato has a kernel with underclock, undervolt and overclock support. The recommended app for working with it is trickster, and folks are getting good results.
So far the s-pen handwriting recognition has been disappointing to me. I used some of my 25 dollar Play credit to buy My Script Notes Mobile.
Using it basically requires disabling the use of the GPU for 2d rendering at this time. That's too bad, because doing so does have some impact on overall performance at least in benchmarks. I'm undecided on whether it's also a real issue in use (just learned of the fix last night) and the handwriting recognition is very good.
roustabout said:
So far the s-pen handwriting recognition has been disappointing to me.
Click to expand...
Click to collapse
Really?
I found the handwriting recognition to be amazing... Perhaps I'm just lucky, but my messy inconsistent poorly formed chicken scratch gets recognised perfectly every time... I was actually surprised because I thought I would have to learn to write carefully and slowly to make use of this feature.
I'm thrilled I can whip out the S Pen and scrawl across the screen at speed and the device just understands... Hell, even I can't make out my letters sometimes.
@herts,
Thanks for liking the Hidden Note 8 concept. I'm designing the 3rd version of it with an integrated micro USB wired 3mm thick keyboard. The TPU protected Note 8 and the keyboard would be housed in a 16mm thick notebook.
Yup, it's overkill but it works for some people. More on that thread one i finish making it.
I've been trying to use Directory Bind so that large data would be on the external card and "ghosted" on to the main device memory when the app is used. Initially it works, but then the links disappear on a restart. This was successful with my Note 2, where the direct-wifi file transfers go directly onto my large capacity micro SD card.
Sent from my GT-N7100 using XDA Premium HD app
Finally got my Note 8.0 last night (a week later than planned) and will add my initial thoughts to the OP.
Basically its that I love the tablet but am a little overwhelmed at the additional features and applications added by Samsung. Need to get comfortable with them and remove those which I dont use. As a fan of efficiency, even if i only get a few extra minutes of battery life or a few extra mb free, ill still get rid of functionality I wont make use of...
FaeMinx said:
Really?
I found the handwriting recognition to be amazing... Perhaps I'm just lucky, but my messy inconsistent poorly formed chicken scratch gets recognised perfectly every time... I was actually surprised because I thought I would have to learn to write carefully and slowly to make use of this feature.
I'm thrilled I can whip out the S Pen and scrawl across the screen at speed and the device just understands... Hell, even I can't make out my letters sometimes.
Click to expand...
Click to collapse
Me too, unfortunately the default settings aren't necessatily the best.
HasC in the note 10.1 Tips and Tricks thread has a great video on setting up recognition which is applicable for the note 8:
http://forum.xda-developers.com/showthread.php?p=30747569
Do you find the 8PI accurate? I use another pen and found it okay by two pixels at a perpendicular angle and at a slant is of by as many as five MM.
Sent from my GT-N5110 using XDA Premium HD app
Bonisaur said:
Do you find the 8PI accurate? I use another pen and found it okay by two pixels at a perpendicular angle and at a slant is of by as many as five MM.
Sent from my GT-N5110 using XDA Premium HD app
Click to expand...
Click to collapse
I've had no issues with it with the initial test sketches I've been doing with it.
I have found I leave the battery saving option in the spen settings on as I am a bit OCD about saving battery. It means I have to pull the supplied spen out a small amount when I want to use the 8pi, but I have no issues in doing this.
I read alot about the pens being slightly off, I even started a thread about it in the Q&A section of this forum, but I'm finding it to be very accurate with this device, even when using it at an angle.
There doesnt seem to be a left handed or right handed option in this tablet which makes me thing that an offset with an older Note may be purposely put there to account for people holding a pen at an angle. What ever orentation I'm using the tablet in, the pointer on the screen seems to be at the tip of the nib, so I am happy.
Added some more comments to the OP about my experience having had the tablet a few days now. added a link to the root tool i used. and a few extra comments on some of the apps i am using.
Some screen shots of my desktop area and settings...
added a but more of my experience having had the tablet a week or 2 now.
My stylus is pretty much perfect. I dont know with the others but mine is fine. Maybe because my hand are not shaky? hahaha.
alicepattinson said:
My stylus is pretty much perfect. I dont know with the others but mine is fine. Maybe because my hand are not shaky? hahaha.
Click to expand...
Click to collapse
Shaky hands? Are you refering to the person who was complaining about the handwriting recognition? I've had no issues with both the supplied stylus or the 8pi. Both are working fantastically and I preffer the handwriting input to the keyboard when inputting text and even better with the drawing applications I've tried so far.
Added further experience. switched from set CPU to Trickster Mod and included my current settings. Got a new case and few new apps.
Not decided whether I will condence my experience progress into one section with my final result or leave it as it is showing how I came to the conclusions I have...

My Z4 Tablet Pros and Cons

This might help people eyeing the Z4 Tablet, but are unsure of what positives and negatives there are. Of course, this is highly subjective, but this is my list. It's influenced by my personal competing choices which were the Samsung Galaxy Tab S2 and the Google Pixel C. I'm happy I chose the Sony Xperia Z4 Tablet.
Pros:
Fast SoC (Qualcomm Snapdragon 810)
This is Qualcomm's 2015 flagship SoC and from what I've experienced it's really fast. Android flies. It also runs 64-bit, which it should anyway, but for example Samsung's Tab S2 doesn't. I don't know about the graphical performance as I don't really play games.
'Compatible' SoC (Qualcomm Snapdragon 810)
This opens up the way for optimized-for-specific-SoC apps (like RSBrowser, which is Snapdragon-optimized and significantly faster than stock Chrome/Chromium) and CyanogenMod support, that need documentation/drivers. For example, Samsung's (faster) Exynos SoC's are a black box for developers, which makes things like this very hard and has the result of devs abandoning it.
Big internal storage (32GB)
32GB is plenty of storage for apps and a reasonable amount of media. But that can be stored on the microSD.
microSD capability (up to 128GB)
This is a major benefit for a media consumption device like this, which many devices don't have.
Good multitasking
I could have mentioned 3GB RAM, but that doesn't tell the whole story. Multitasking on the Z4 is pretty darn good. It swtiches quickly and is generally very snappy. My Samsung Galaxy S6 with 3GB RAM has pretty bad RAM management in comparison. I'm still trying to find a custom kernel for it that keeps the phone snappy after 2 days.
Huge screen solution, high ppi on a big screen
2560x1600, 299ppi. On a big 10.1 inch screen. This is wonderful.
16:10 aspect ratio screen
Which is good for widescreen content like movies and dSLR photo's. 16:10 also beats 16:9 for me because of the added screen height.
Screen has natural, accurate colors
Very subjective, but compared to several other screens I've found this one to be superior.
Front facing stereo speakers
A rare thing among Android devices. Good design choice.
Lightweight (~390gr), thin
It's pleasantly light to hold.
NFC, notification LED, GPS, vibration motor
These features are often overlooked, but are important to me. I use NFC for LastPass, the (multicolor!) LED with LightFlow to see what exactly is asking my attention when in standby, vibration to still be notified when I want the tablet to be silent and GPS for the occasional navigation need or social app check-in.
Qualcomm Quick Charge 2.0
Another nice bonus, which isn't mentioned much. Quick Charge makes a major difference to charging speed. Needs a compatible charger though.
Big battery (6000mAh)
Can't yet say battery life is amazing, because I'm using it a lot and crank the screen brightness up quite high so don't know what to expect. Reviewers seem to agree it's great though.
Bootloader can be unlocked (so the road is open for rooting)
No waiting for an exploit if you're OK with going this route. Just follow Sony's instructions and you'll have root in no time.
Marshmallow announced
Should come January '16 I heard, but these things always get delayed :| At least it's coming.
AOSP commitment by Sony
Sony's Open Device Program is nice and all, but their sources are a bit troublesome and don't seem to produce functional ROMs. Still, Sony's stance on it might bode well for future things.
Water-/dustproof
I don't care much myself, but it's a nice bonus. At least it takes some worries away (dropping liquids on it, no fear for dust particles between the screen and the glass).
Keyboard dock option
Nice for when you want to use a physical keyboard that is fully compatible and is also attachable. I use a 3rd party BT keyboard, but I'm constantly fighting with fixing incompatible button mapping stuff.
Important root-specific things that work
These things are not guaranteed to work or be available on any rooted device, and are pretty major in adding possibilities, so I consider them pros to be working on the Z4T:
Xposed Framework
For most people anyway (Some are having issues). This is a thing to be happy about, because if it didn't, chances are it wouldn't be fixed anytime soon because of the small user/dev base. Xposed opens up many possibilities which really enhance a device. To me it's a selling point.
Native KCAL support
Another Qualcomm exclusive. I believe this is actually fully present on the stock ROM, but not fully controllable (limited to RGB in the Settings menu). KCAL support enables you to tweak various image parameters, like RGB, saturation and contrast with a tool like Color Control or Kernel Adiutor. It's pretty great and you don't see it often.
Cons:
SoC might overheat in extreme circumstances
Haven't had any problems myself, and I stress the tablet pretty hard, but I've read some reports about issues. At least of a guy bringing the tablet to the beach. It's mostly just people saying it's fine, even with heavy usage.
Speakers are lacking in bass
No surprise, but it's still a letdown.
Bad low-light camera performance, no flash
Picture quality in low light is disturbingly bad. Having no flash makes this unusable in those situations. Not a big deal for me personally, I don't take pics with a tablet.
Screen isn't that bright
Compared to several others, the screen isn't that bright and needs to be cranked up pretty much, even indoors. Outdoors, this is a problem. The big screen reflectiveness doesn't help either. Indoors it fine, it just that the needed high brightness level eats battery.
Screen lacks deep blacks
This is compared to (S)AMOLED, specifically. Those screen blacks are amazing and darker colors are also good for battery on those screens. IPS screens just don't have that. Using dark themes won't help battery life on the Z4T, it may even be worse with them.
Stock charger isn't Quick Charge 2.0
Come on, Sony.
No hardware navigation buttons
This is a real PITA for me because this requires Android's soft keys / navigation bar which take up valuable screen space. This is especially problematic in landscape mode on this 16:10 ratio in which you'll want every screen height you can get. Fortunately, this can be overcome by tools like GMD Full Screen Immersive Mode (with full screen keyboard typing restrictions so you'll have to switch back to type :S) combined with All in One Gestures, both of which don't reqquire root. Better yet is a build.prop edit that declares to Android the tablet has hardware buttons, removing the soft keys entirely, while keeping the ability to type anywhere. I navigate using All in One Gestures, because GMD GestureControl sometimes stops working. Which isn't very nice when you don't have navigation keys
No user-land root exploit (yet)
Because of this, you'll need to unlock the bootloader to gain root access. Which will destroy your TA partition, which will in turn remove Sony-proprietary functions. Which I personally don't use and don't see much use for anyway. Also, unlocked bootloader can't be undone without Sony noticing, so as a non-EU citizen you'll possibly have warranty issues.
Small user/dev community
Not many people own a Z4 Tablet (bad availability in the US and it's expensive) and because of this, there's next to no development for it. Luckily, we have @AndroPlus who's made a custom kernel and ported TWRP (which unfortunately has a bug that keeps us from restoring the system partition from a backup). @DHGE worked on root, which made it possible in the end I think. Still, custom ROMs would be nice. Also, if you run into device-specific problems, there's not many others that can help, because you're either the only one or one of very few who have that problem.
It's expensive
The price is very high and a bit hard to justify.
What I miss:
Wireless charging
This is sooo convenient. It also spares the precious MicroUSB port, which is used for charging, data-transfer, USB-OTG and adb/fastboot. If it breaks, you're done.
Removable battery
Batteries do not have eternal life, so eventually it will be completely dead. Which will render the tablet dead as well.
Any thoughts, questions, additions or critique is welcome.
jelbo said:
[*]Small user/dev community
Not many people own a Z4 Tablet (bad availability in the US and it's expensive) and because of this, there's next to no development for it. Luckily, we have @AndroPlus who's made a custom kernel and ported TWRP (which unfortunately had a bug that keeps us from restoring the system partition from a backup). @DHGE worked on root, which made it possible in the end I think. Still, custom ROMs would be nice. Also, if you run into device-specific problems, there's not many others that can help, because you're either the only one or one of very few that have that problem.
.
Click to expand...
Click to collapse
Hello jelbo. Let's discuss about it. First of all, our tablet is not alone with some sort of problem. z3+ and z5 devices are the same story. I don't really understand how can we have aosp sources but not to have its rom. So what the problem, some building problem, or is it true that aosp roms works without working sensors? People give different feedback. Did you try some aosp rom? I just want to cook aosp rom in ubuntu.
alex009988 said:
Hello jelbo. Let's discuss about it. First of all, our tablet is not alone with some sort of problem. z3+ and z5 devices are the same story.
Click to expand...
Click to collapse
Yes, they're similar. Which actually makes me think about a positive point as development for those devices can also benefit Z4T owners. For example @[NUT]'s efforts may eventually reach us, or when an Xperia user-land exploit is found, it will likely be shared among different devices.
I don't really understand how can we have aosp sources but not to have its rom. So what the problem, some building problem, or is it true that aosp roms works without working sensors? People give different feedback. Did you try some aosp rom? I just want to cook aosp rom in ubuntu.
Click to expand...
Click to collapse
I'm not too sure about the reasons, but what I've seen is that 1) the Sony sources are/have been a bit buggy/messy 2) not many people compile ROMs from it (I've only seen 2 XDA users and the FXP Team).
I haven't yet dared to flash any AOSP build because I've been too busy on getting stock rooted to my liking and troubleshooting my Xposed issues and I don't want to interrupt that. It seems to be quite easy to flash ROMs though, it's either a TWRP flashable .zip, Flashtool flashable .tft or fastboot flashable .bin files.
I'm also curious about the mixed reports about 'sensor stuff not working' and 'everything works fine' on Sony-sourced AOSP builds, but so far no-one has answered my or your questions about it. Seems we'll have too find out ourselves at some point Best leave that part of questions and discussion in their respective threads to keep things organized.
Nice summary, thanks for the effort; its clear and concise.
jelbo said:
it's either a TWRP flashable .zip,
Click to expand...
Click to collapse
I think free xperia team jeer at us cause twrp has a serious bug and it can't flash any roms for the time being whereas we can see exactly .zips at their site.
Interesting, had they even tested themselves what they uploaded
jelbo said:
Yes, they're similar. Which actually makes me think about a positive point as development for those devices can also benefit Z4T owners. For example @[NUT]'s efforts may eventually reach us, or when an Xperia user-land exploit is found, it will likely be shared among different devices.
Click to expand...
Click to collapse
I've put XZDualRecovery on 'feature freeze' for 2.8 well over a year ago, because it needs some work to keep it working on the ever changing Android eco-system. As a consequence, I also stopped adding devices to the supported devices list. For XZDR 2.9 things will change and I will start adding devices again, remember that I am just on my own, from time to time I have a helper but they generally drop out after a while and I'm on my own again after that... I have a busy real life and a very busy job, which consumes most of my energy, leaving only little amounts of it for use on the XZDR development unfortunately... and I have big plans with it which I'd rather deploy sooner then later.
As security features increase, so do the difficulties to keep XZDR working properly... For the Z3+/Z4/Z5/M4 Aqua it is dm-verity, which throws a tantrum once the system partition is modified, which in turn causes a reboot (and with that a bootloop). This behavior has hampered the Stock Based custom ROM development and made it generally impossible to root the device...
A backup-ta with a built-in root exploit (similar to the XZDR installer) to allow a backup of the TA partition would kick-start the development for these models. People don't mind unlocking their devices but do mind losing their warranty on a 500-700 euro device... so most of them wait for the possibility to backup their TA partition.
Oh, and to actually participate in this topic:
I have to say the Z4 tablet takes my fancy and tics just about all the boxes of things I like about tablets... I own a Xperia Tablet Z, well, the misses has it now and I can 'occasionally' touch it :silly: and I have been looking for a new tablet to actually use myself
I don't have the funds to purchase a TabZ4, but I would really like to have one with the keyboard dock
[NUT] said:
Oh, and to actually participate in this topic:
I have to say the Z4 tablet takes my fancy and tics just about all the boxes of things I like about tablets... I own a Xperia Tablet Z, well, the misses has it now and I can 'occasionally' touch it :silly: and I have been looking for a new tablet to actually use myself
I don't have the funds to purchase a TabZ4, but I would really like to have one with the keyboard dock
Click to expand...
Click to collapse
Hello. Thanks for participating our thread. Tab Z4 is a great device with cool hardware, but it is less developed in comparison with Samsung to my regret. All we want for this moment are a fix of bug for twrp, problem with mounting the system, and some customs roms. And the very big dream is cyanogenmod of course
@jelbo, where in NL do you live? Did you root your TabZ4 yet?
---------- Post added at 02:28 PM ---------- Previous post was at 02:26 PM ----------
alex009988 said:
Hello. Thanks for participating our thread. Tab Z4 is a great device with cool hardware, but it is less developed in comparison with Samsung to my regret. All we want for this moment are a fix of bug for twrp, problem with mounting the system, and some customs roms. And the very big dream is cyanogenmod of course
Click to expand...
Click to collapse
Well, I am assuming that custom ROM's will come as soon as there is a viable way to flash them
I wonder why @AndroPlus wasn't able to fix the TWRP mount issues yet...
alex009988 said:
Hello. Thanks for participating our thread. Tab Z4 is a great device with cool hardware, but it is less developed in comparison with Samsung to my regret. All we want for this moment are a fix of bug for twrp, problem with mounting the system, and some customs roms. And the very big dream is cyanogenmod of course
Click to expand...
Click to collapse
I'm pretty confident CM will support the 'karin' at some point. Many other Sony phones/tablets are officially supported.
[NUT] said:
@jelbo, where in NL do you live? Did you root your TabZ4 yet?
Click to expand...
Click to collapse
I'll tell you in a PM Yeah, I've unlocked my bootloader and rooted it. I couldn't restrain myself anymore It's so much better now. Just some littles gripes left that'll be fixed sooner or later.
Well, I am assuming that custom ROM's will come as soon as there is a viable way to flash them
I wonder why @AndroPlus wasn't able to fix the TWRP mount issues yet...
Click to expand...
Click to collapse
Time restraints, who knows? He did post a v11 version of the kernel some days ago though @dl12345 who greatly helped him getting TWRP to work, may be able to fix it, but he hasn't been around. You can follow some technical details about it in the AndroPlusKernel thread.
It's just /system/ that cannot be restored though. Which is bad, but you can get out of a bad situation pretty quickly with restoring /data/ and using Helium/Titanium Backup, I think. Unless you really fried the ROM and need your /system/ back, then you can only go the flashtool route now
jelbo said:
I'm pretty confident CM will support the 'karin' at some point. Many other Sony phones/tablets are officially supported.
I'll tell you in a PM Yeah, I've unlocked my bootloader and rooted it. I couldn't restrain myself anymore It's so much better now. Just some littles gripes left that'll be fixed sooner or later.
Time restraints, who knows? He did post a v11 version of the kernel some days ago though @dl12345 who greatly helped him getting TWRP to work, may be able to fix it, but he hasn't been around. You can follow some technical details about it in the AndroPlusKernel thread.
It's just /system/ that cannot be restored though. Which is bad, but you can get out of a bad situation pretty quickly with restoring /data/ and using Helium/Titanium Backup, I think. Unless you really fried the ROM and need your /system/ back, then you can only go the flashtool route now
Click to expand...
Click to collapse
* [NUT] pokes @AndroPlus to join this conversation.
Due to lack of time on my side to read the entire topic, what exactly fails when restoring system?
@jelbo, do you have his kernel installed (a.k.a. have you unlocked your bootloader)?
[NUT] said:
* [NUT] pokes @AndroPlus to join this conversation.
Due to lack of time on my side to read the entire topic, what exactly fails when restoring system?
@jelbo, do you have his kernel installed (a.k.a. have you unlocked your bootloader)?
Click to expand...
Click to collapse
Yes and yes. Basically anyone here who's rooted their tablet is running AndoPlusKernel and have manually unlocked their bootloader.
jelbo said:
Yes and yes. Basically anyone here who's rooted their tablet is running AndoPlusKernel and have manually unlocked their bootloader.
Click to expand...
Click to collapse
I see, that un-complicates testing a lot
Gotta say... amazing tablet all together and the first device that i havent seen the mighty snapdragon handwarmer throttle from heat in. I kept roasting it for about 3 hours with simpleplanes and PC minecraft (boardwalk app) and it didnt lose any performance just got a bit hot on the back middle. I find the battery life to be good enough for a day of being on and off watching youtube and occasional gaming but i do keep screen brightness on auto at all times and features such as BT NFC and GPS off. Also a app that i think the tablet should have from factory: OGYoutube, you can have floating resizeable youtube above other apps or play in background or with screen off and download in mp4 or mp3.
I'd picked up a Z4T about 4 months ago to replace two different devices, my aging and finally dead cell phone (I hung on to my old Samsung S3 for way too long), and my laptop, which is a still functional but extraordinarily heavy beast of a 17" macbook - about 6 years old on its own as well. What can I say, they were still working so why buy new?
I have to say I'm very glad I made the purchase. I picked up a SBH52 handset to make phone calls more convenient, and splurged on the sony docking kb for the added ruggedness of using it as a "case" - which it does like a champ. Calls are nice and clear, and I've had pretty much no troubles - aside from some occasional static when using the handset (which I owe to the handset itself being a bit flaky). Even with an unlocked BL, remote play on my PS4 still works, only the Bravia screen mirroring to my TV is kaput. It serves very well as a laptop for those like me that need something lightweight for overnight trips, let with a big enough screen to be able to remote desktop troubleshoot back to the main office.
Would this replace every computer I own? Obviously not. I still own a high end desktop for videos, games, and intense word processing (the sony kb is just a bit small if you were attempting to write a novel for example); and my PS4 for console games; but for light end use and for traveling, it's almost the perfect laptop replacement. And as a combo cellphone laptop? I couldn't ask for better. My overall data usage has also dropped, because I'm using far more wireless on this device (I want to make sure it's connected for the stability if nothing else), but I can always drop out to a cell connection if no wireless is available - or if I don't feel like paying the stupid prices at the hotel the convention is being held at.
Now for the Cons:
I've really only got two, one of which was mentioned here. The damn thing is not cheap. Since I live in the states, the LTE version is not available directly. You need to pick up an international version from amazon or another reputable source. Hence the reason I have a kb with extra non-english symbols on it. Not that I mind, but it confuses some people when they look at it. When I picked mine up, the tablet kb and handset ran about $900 US all together. so not something you want to accidentally brick, or drop, or leave behind in a restaurant....
The second one is convenience. Given that it is a tablet - and a fairly large one, most people aren't going to go the phone replacement route like I did. You can't exactly just slip it into your pants pocket. And since the handset is BT, you can't exactly leave the tablet in the car and just use the handset inside most restaurants either (unless you park really close to the building). I'll often leave mine at home if all I do is run to the store for a dozen eggs or something, just because it's easier not to pack it up. But then half an hour of being unconnected and out of touch doesn't bother me - it might bother some though.
So there you have it, a much less technical review, from yet another satisfied user.
begalund said:
I'd picked up a Z4T about 4 months ago to replace two different devices, my aging and finally dead cell phone (I hung on to my old Samsung S3 for way too long), and my laptop, which is a still functional but extraordinarily heavy beast of a 17" macbook - about 6 years old on its own as well. What can I say, they were still working so why buy new?
I have to say I'm very glad I made the purchase. I picked up a SBH52 handset to make phone calls more convenient, and splurged on the sony docking kb for the added ruggedness of using it as a "case" - which it does like a champ. Calls are nice and clear, and I've had pretty much no troubles - aside from some occasional static when using the handset (which I owe to the handset itself being a bit flaky). Even with an unlocked BL, remote play on my PS4 still works, only the Bravia screen mirroring to my TV is kaput. It serves very well as a laptop for those like me that need something lightweight for overnight trips, let with a big enough screen to be able to remote desktop troubleshoot back to the main office.
Would this replace every computer I own? Obviously not. I still own a high end desktop for videos, games, and intense word processing (the sony kb is just a bit small if you were attempting to write a novel for example); and my PS4 for console games; but for light end use and for traveling, it's almost the perfect laptop replacement. And as a combo cellphone laptop? I couldn't ask for better. My overall data usage has also dropped, because I'm using far more wireless on this device (I want to make sure it's connected for the stability if nothing else), but I can always drop out to a cell connection if no wireless is available - or if I don't feel like paying the stupid prices at the hotel the convention is being held at.
Now for the Cons:
I've really only got two, one of which was mentioned here. The damn thing is not cheap. Since I live in the states, the LTE version is not available directly. You need to pick up an international version from amazon or another reputable source. Hence the reason I have a kb with extra non-english symbols on it. Not that I mind, but it confuses some people when they look at it. When I picked mine up, the tablet kb and handset ran about $900 US all together. so not something you want to accidentally brick, or drop, or leave behind in a restaurant....
The second one is convenience. Given that it is a tablet - and a fairly large one, most people aren't going to go the phone replacement route like I did. You can't exactly just slip it into your pants pocket. And since the handset is BT, you can't exactly leave the tablet in the car and just use the handset inside most restaurants either (unless you park really close to the building). I'll often leave mine at home if all I do is run to the store for a dozen eggs or something, just because it's easier not to pack it up. But then half an hour of being unconnected and out of touch doesn't bother me - it might bother some though.
So there you have it, a much less technical review, from yet another satisfied user.
Click to expand...
Click to collapse
Thanks for sharing
So I am coming to this device from the Nvidia Shield Tablet and I love the device thus far for all of the positive reasons mentioned. Also with respect to screen brightness listed as a con my own experience is that it is much better than what I was coming from.
The battery life is truly great with this device and my needs are small when it comes to the development area. I simply need it to be rooted because I prefer to remove all of googles garbage that I don't use and rooting and bootloader unlock was very simple.
All in all I am really liking this device, had it about 10 days now. I have the LTE version but only because I may use it at some point.
Overall very pleased with the device so far.
ThePhoneGeek said:
So I am coming to this device from the Nvidia Shield Tablet and I love the device thus far for all of the positive reasons mentioned. Also with respect to screen brightness listed as a con my own experience is that it is much better than what I was coming from.
The battery life is truly great with this device and my needs are small when it comes to the development area. I simply need it to be rooted because I prefer to remove all of googles garbage that I don't use and rooting and bootloader unlock was very simple.
All in all I am really liking this device, had it about 10 days now. I have the LTE version but only because I may use it at some point.
Overall very pleased with the device so far.
Click to expand...
Click to collapse
I was seriously considering the Shield because of the dev scene and the price. What made you switch?
jelbo said:
I was seriously considering the Shield because of the dev scene and the price. What made you switch?
Click to expand...
Click to collapse
The device itself just isn't very efficient on battery and I needed something with a slightly larger screen. It does ok but it's really designed more as a gaming device IMO which wasn't what I needed. Also the specs are a bit outdated now.
I noticed in the op that he said being a non eu customer when unlocking bootloader they will notice. Im an eu user, does this mean that they wont notice if I try claim warranty after bootloader unlock? I havent unlocked yet but I was getting slow WiFi and disconnections. I really want root but im not sure about this WiFi issue I set the WiFi to turn off at sleep and it seems better also the issues are caused less im concerned what would you guys do? ive sent it off to Sony once already they said nothing was wrong with wifi. Can someone help me decide? Much appreciated, many thanks.

Is sched really an efficient governor?

Pretty much since the first day I've used the Pixel I've felt that the sched governor is not efficient despite claims to the contrary by pretty much everyone who has replied to my posts including devs. All the custom Roms I've tried for the Pixel XL use sched and all the custom kernels I've tried use it as well. Nobody has ever responded with any sort of explanation of how sched can be efficient when it makes both the Pixel battery and cpu temp rise so much almost the instant you pick up the phone.
An XDA article posted about EAS being ported to an old phone included a link explaining what EAS does. But if you read the second post the writer who appears to be a dev comes to the conclusion that sched is not actually a particularly efficient governor:
https://forum.xda-developers.com/u11/development/kernel-kirisakura-eas-0-7-energy-aware-t3647471
So I'm still wondering why most people in these threads continue to insist that sched is so wonderful and efficient that it can't be improved on and why devs for the most part don't seem to be trying to offer an alternative to it.
jhs39 said:
Pretty much since the first day I've used the Pixel I've felt that the sched governor is not efficient despite claims to the contrary by pretty much everyone who has replied to my posts including devs. All the custom Roms I've tried for the Pixel XL use sched and all the custom kernels I've tried use it as well. Nobody has ever responded with any sort of explanation of how sched can be efficient when it makes both the Pixel battery and cpu temp rise so much almost the instant you pick up the phone.
An XDA article posted about EAS being ported to an old phone included a link explaining what EAS does. But if you read the second post the writer who appears to be a dev comes to the conclusion that sched is not actually a particularly efficient governor:
https://forum.xda-developers.com/u11/development/kernel-kirisakura-eas-0-7-energy-aware-t3647471
So I'm still wondering why most people in these threads continue to insist that sched is so wonderful and efficient that it can't be improved on and why devs for the most part don't seem to be trying to offer an alternative to it.
Click to expand...
Click to collapse
So I went ahead and googled "energy aware scheduling explanation" and got some great material to check out...
So from https://developer.arm.com/open-source/energy-aware-scheduling I read
Energy Aware Scheduling (EAS) is an enhancement to Linux power management, unifying CPU power control under the Linux kernel. EAS extends the Linux kernel scheduler to make it fully aware of the power/performance capabilities of the CPUs in the system, to optimize energy consumption for advanced multi-core SoCs including big.LITTLE. With EAS, the Linux kernel will use the task load and a CPU ‘Energy Model’ to control task placement to select the optimal CPU to run on.
Click to expand...
Click to collapse
from the same post you're referencing https://forum.xda-developers.com/u11/development/kernel-kirisakura-eas-0-7-energy-aware-t3647471
EAS is a completely different breed compared to the conventional HMP system, where it serves an entirely different purpose of achieving the optimal balance between performance and efficiency, with the latter taking the top spot. EAS achieves that via cleverer tasks placement, by which the system determines which is the more efficient cluster for the task to be processed by, as well as categorising the different tasks into cgroups (top-app, foreground and background, in order from highest priority to lowest priority respectively) by which each cgroup receives its sliver of the available firepower (cpuset). EAS also offers the capability of inflating the perceived load, that's determined by the load trackers, of the task in any of the cgroups via its schedtune.boost setting, and whether the task should be processed by all the cpu cores available or only by the cluster the task has been placed on via its schedtune.prefer_idle setting. One of the key features of EAS is lifting almost all the processing from the governor to the CPU scheduler (no it is not the I/O scheduler, something different) and letting it take much much more control, leaving the CPU governor to only do the frequency determination part, which unsurprisingly relies heavily on data supplied by the scheduler. With all that said, it is easily deduced that EAS is not all about governors and governor settings and the like, rather a much cleverer solution that serves the purpose of seeking the best balance between performance and efficiency, and to ensure the CPU is not overdoing a task or the CPU governor is overshooting a simple task, which would attribute to needlessly draining a lot of power as a natural consequence. EAS is about ensuring you get the smoothest UI possible while retaining as much power as possible. However, that does not mean that EAS is lame poor when it comes to performance. Sometimes, if not in most cases, this cleverer tasks placement makes tasks get processed faster, a point that is already proved quite well by the EAS-supporting non-OOS based custom ROMs like VertexOS, ZeNiTy-RR and PAEX. Conserving battery does not necessarily mean crushing performance. This explains that app launches are on-par with HMP if not ahead of it sometimes.
Click to expand...
Click to collapse
also, the guy was comparing two options for EAS. he was saying schedutil is more efficient in comparison to sched because how each one was designed and explains why it is better. Here's something showing that Google has already been moving to schedutil https://www.linuxplumbersconf.org/2...ations/3693/original/LPC- EAS for Android.pdf
---------- Post added at 04:06 PM ---------- Previous post was at 03:54 PM ----------
jhs39 said:
So I'm still wondering why most people in these threads continue to insist that sched is so wonderful and efficient that it can't be improved on and why devs for the most part don't seem to be trying to offer an alternative to it.
Click to expand...
Click to collapse
another big reason developers are moving away from it is the fact that HMP (Global Task Scheduling) is being deprecated plain and simple.. https://developer.arm.com/-/media/d...eduling/BUD17_ProductCodeline_Info5.pdf?la=en
Here is an html version of the pdf so you dont have to download anything https://webcache.googleusercontent....ine_Info5.pdf?la=en+&cd=1&hl=en&ct=clnk&gl=us
My Pixel XL overheated and shut down yet again today while I was using Maps, Spotify and the car charger at the same time and it wasn't even that hot out today--low 80's. If you contact Pixel support they will actually tell you that overheating is the most common complaint they get on a daily basis followed by poor battery life. You don't see any possible way that those two problems and the kernel behavior might actually be related?
I'm also starting to see more posts from people who say that their Pixels just died without warning, not responding to being plugged in or holding down the power button or anything else. If this problem starts to become widespread enough that even the Pixel cheerleaders in these threads can't ignore it then maybe some people here will finally admit that the phone runs too hot even with the supposed benefits of EAS and the sched governor.
I'm going to again suggest that people leave XDA and look at the official Pixel support threads from Google to get a better idea of how many people are actually having serious problems with these phones.
You might also want to consider contacting Pixel support and telling them that your phone overheated. That way you can get your own copy of the full page pre-prepared list of all the reasons the Pixel might overheat and shut down under what would widely be considered normal use. They've e-mailed the exact same word for word list to me 3 times and I'm sure they would be happy e-mailing the list to you.
I've also followed all the suggestions from Pixel Support. I downgraded from Android O back to Nougat. I ditched my car charger and bought the one sold in the Google Store. I ditched my protective case and switched to a bumper style case so the back of the phone wouldn't be covered. I managed to go 3 or 4 weeks without the Pixel XL overheating and shutting down but it finally happened again today.
The Pixel XL is the only phone I've ever owned that overheated and shut down. I've had cheap phones and mid priced phones and I have a Nexus 6P. I used them all the same way and the only one that ever had an overheating problem is the one that employs EAS and the sched governor.
The overheating problem even corresponds with the specific flaw that the dev found in his detailed analysis of sched--when CPU use starts to approach being high sched pushes the CPU frequency higher than is usually necessary and always maintains it at that level for longer than is necessary, which would explain why overheating is the number one problem reported to Pixel Support daily.
jhs39 said:
You might also want to consider contacting Pixel support and telling them that your phone overheated. That way you can get your own copy of the full page pre-prepared list of all the reasons the Pixel might overheat and shut down under what would widely be considered normal use. They've e-mailed the exact same word for word list to me 3 times and I'm sure they would be happy e-mailing the list to you.
I managed to go 3 or 4 weeks without the Pixel XL overheating and shutting down but it finally happened again today.
The Pixel XL is the only phone I've ever owned that overheated and shut down. I've had cheap phones and mid priced phones and I have a Nexus 6P. I used them all the same way and the only one that ever had an overheating problem is the one that employs EAS and the sched governor.
The overheating problem even corresponds with the specific flaw that the dev found in his detailed analysis of sched--when CPU use starts to approach being high sched pushes the CPU frequency higher than is usually necessary and always maintains it at that level for longer than is necessary, which would explain why overheating is the number one problem reported to Pixel Support daily.
Click to expand...
Click to collapse
no, i dont want to consider falsely reporting an issue because that complaint remains on my account so if I ever do have an actual issue with my device they'll think i'm just lying to get them to replace it for free.
went back to N, but you're running O as it rebooted meaning you know what works for your phone and what doesnt and you still chose to run something you knew doesn't work... user error...
so even though you are provided with explanations as far as how sched works you're gonna maintain the opinion that it's actively worse and the root of your problem despite using sched on bone-stock worked for no issue for 3-4 weeks...
what you're describing is what HMP would do on it's own and you wouldnt even notice. he's describing the processor running at a higher frequency than needed. So if 1.6 GHz are needed it's running at 1.65 to meet the demand. This does not mean the device will suddenly clock itself at a frequency that should not be possible and harming the device as a result.
if you have such a problem with your phone overheating you need to contact google and get your device replaced, or buy something else and until you do so I'll keep this tiny violin playing just for you.
My cpu tends to run around 118F on elementalX, using a case ambient temp about 78. Not concerning for me. I'm always playing games though, in the rare instance I'm not doing anything on it I can expect to see 105-113F.

Categories

Resources