Database Users

Nexus 7 kernel issues...

I posted this over at rootz earlier today and didn't get any bites so I figured I'd give it a shot over here.
I may be the only one in the world experiencing this problem. Looked around quite a bit and don't see any sign of others having this issue... Anyway, my N7 doesn't seem to like it when I flash a new kernel. I've tried several different kernels and when ever I flash one my display will not wake up once it times out or if I turn the display off manually. Once the screen goes dark i have to hold the power button down and reboot. I have zero issues with custom kernels as long as they are baked into the rom. I typically wipe cache and dalvic after flashing kernels...
Sent from my Galaxy Nexus using xda app-developers app

Little bump here... 130 views and not a peep... :-/

scram99 said:
Little bump here... 130 views and not a peep... :-/
Click to expand...
Click to collapse
youre experiencing "sod", which is a fairly common problem with android 4.2.1 source code(not as common on the n7 as the gnex, but common enough). do you flash the kernel with the rom or do you flash the kernel separately?

This happens after switching out the kernel on any ROM I've used. Have not flashed a different kernel at the same time I flashed a ROM. I don't think that will make a difference. I can however flash kernels over my stock rooted backup... I don't know. Just weird and bums me out being limited like this...

scram99 said:
This happens after switching out the kernel on any ROM I've used. Have not flashed a different kernel at the same time I flashed a ROM. I don't think that will make a difference. I can however flash kernels over my stock rooted backup... I don't know. Just weird and bums me out being limited like this...
Click to expand...
Click to collapse
I would just factory reset and start from scratch. Do you have any settings set like UV??
Sent from my Nexus 7 using xda premium

I have tried flashing back to stock, relocking and starting from scratch. I do not undervolt...
A few good folks in the android community had experienced similar happenings and suggested lean kernel... Flashed it earlier this evening and working like a charm.

So, i want to root, but I have a couple of questions

I noticed that looking at a blank white page on my Nexus 4 that it wasn't as white as I would love. So I searched and found out I could calibrate it.
I prefer not to use a different kernel, so I would like to use this app: https://play.google.com/store/apps/details?id=com.nexus4displaycontrol
Question #1: Is that app good? Like would it fix my problem?
Question #2: I would like to get updates from Google as well, how does that work with a rooted phone? Will I lose my calibration once I update?
That's all the questions I have.
Thanks!

thenerdal said:
I noticed that looking at a blank white page on my Nexus 4 that it wasn't as white as I would love. So I searched and found out I could calibrate it.
I prefer not to use a different kernel, so I would like to use this app: https://play.google.com/store/apps/details?id=com.nexus4displaycontrol
Question #1: Is that app good? Like would it fix my problem?
Question #2: I would like to get updates from Google as well, how does that work with a rooted phone? Will I lose my calibration once I update?
That's all the questions I have.
Thanks!
Click to expand...
Click to collapse
Yes, check his thread for the kernel a well. http://forum.xda-developers.com/showthread.php?t=2002782
A custom rom will probably give you the Google updates faster. But, you'll be able to get updates as well, yes.

Vangelis13 said:
Yes, check his thread for the kernel a well. http://forum.xda-developers.com/showthread.php?t=2002782
A custom rom will probably give you the Google updates faster. But, you'll be able to get updates as well, yes.
Click to expand...
Click to collapse
What's a kernel? Is it like a Linux Kernel? This seems complicated to me. :| Like if I mess up, I'll mess up my phone. What does this kernel do?
And yeah, I was looking at custom rom's. cyanogenmod specifically, but they're doing nightly updates, so I'm worried that if I do use that rom, it'll be buggy and mess up my phone.

thenerdal said:
What's a kernel? Is it like a Linux Kernel? This seems complicated to me. :| Like if I mess up, I'll mess up my phone. What does this kernel do?
And yeah, I was looking at custom rom's. cyanogenmod specifically, but they're doing nightly updates, so I'm worried that if I do use that rom, it'll be buggy and mess up my phone.
Click to expand...
Click to collapse
Oh boy, you have some catching up to do.. Start here http://forum.xda-developers.com/showthread.php?t=2010338
Roms aren't buggy nowadays, you'll be ok.

Vangelis13 said:
Oh boy, you have some catching up to do.. Start here http://forum.xda-developers.com/showthread.php?t=2010338
Roms aren't buggy nowadays, you'll be ok.
Click to expand...
Click to collapse
I've decided to root, but not use a custom rom. Is that okay? I just want to use it to calibrate my screen using the app I saw. And Maybe. Maybe use roms later.
Excited about this.

thenerdal said:
I've decided to root, but not use a custom rom. Is that okay? I just want to use it to calibrate my screen using the app I saw. And Maybe. Maybe use roms later.
Excited about this.
Click to expand...
Click to collapse
Ok, as in do you have our permission..?
He*l yeah mate, you decide what & how big steps forward you take!

Vangelis13 said:
Ok, as in do you have our permission..?
He*l yeah mate, you decide what & how big steps forward you take!
Click to expand...
Click to collapse
One more question. I have tmobile insurance, if I root it, will they replace it still if something happens?

thenerdal said:
One more question. I have tmobile insurance, if I root it, will they replace it still if something happens?
Click to expand...
Click to collapse
Can't answer that I'm not afraid.
You can always unroot though if phone works. Usually they care about the bootloader being unlocked..

Vangelis13 said:
Can't answer that I'm not afraid.
You can always unroot though if phone works. Usually they care about the bootloader being unlocked..
Click to expand...
Click to collapse
Damn, I know that. Just if the screen is unresponsive, is there a way they will be able to find out I rooted?

thenerdal said:
Damn, I know that. Just if the screen is unresponsive, is there a way they will be able to find out I rooted?
Click to expand...
Click to collapse
If the phone turns on they can see if it is bootloader unlocked or not. If it doesn't, they can't tell.
Sent from my Nexus 4 using Tapatalk 2

joshnichols189 said:
If the phone turns on they can see if it is bootloader unlocked or not. If it doesn't, they can't tell.
Sent from my Nexus 4 using Tapatalk 2
Click to expand...
Click to collapse
Recommend me a way to root please. I tried this: http://www.youtube.com/watch?feature=player_embedded&v=g88PPZyvfDI
But the when i plugged in my device in fastboot with usb debugging on, Windows 7 said it couldn't install the drivers correctly. So I didn't continue.

thenerdal said:
I noticed that looking at a blank white page on my Nexus 4 that it wasn't as white as I would love. So I searched and found out I could calibrate it.
I prefer not to use a different kernel, so I would like to use this app: https://play.google.com/store/apps/details?id=com.nexus4displaycontrol
Question #1: Is that app good? Like would it fix my problem?
Question #2: I would like to get updates from Google as well, how does that work with a rooted phone? Will I lose my calibration once I update?
That's all the questions I have.
Thanks!
Click to expand...
Click to collapse
you cant calibrate without a kernel. the google kernel does not expose the needed interfaces and rgb calibration will get you no where. so, no, it will most likely not fix your problem. if you install a custom kernel, then yes, it will solve your problems.
in case youre interested, i compiled a bunch of calibrated google stock kernels for 4.2.2:
http://forum.xda-developers.com/showthread.php?t=2136295
with these simple rgb calibration will be enough.

First of all if you are on the updated 4.2.2 stock kernel you wont be able to use display control apps to change your gamma settings. Google removed access to change the gamma settings on the stock kernel. So you will have to flash a custom kernel.
You can flash a custom kernel and remain on the stock rom. But will have to return back to the stock kernel in order to receive the OTA updates. There are many kernels so just look around in the development sections or even better search videos.
In terms of rooting many will advise you to manually do it yourself as this is the best way and it will increase your understanding of how everything is done. However, not everyone is confident even after learning how everything is donw and would rather use toolkits to prevent mishaps. I would recommend Wugfresh's toolkit.

So the app i used worked! WAY BETTER. What does gamma do?
Also, I rooted. Now what? How do I backup? I want CyanogenMod, but the monthly version, wondering how I can do that.
Thanks.

thenerdal said:
So the app i used worked! WAY BETTER. What does gamma do?
Also, I rooted. Now what? How do I backup? I want CyanogenMod, but the monthly version, wondering how I can do that.
Thanks.
Click to expand...
Click to collapse
I hate to have to say it like that, directly, but there's no other way around it; search & read up mate!
"Now what"..? :what:
No one is gonna hold your hand and walk you through it step by step, you have to do it yourself. There are guides everywhere, check the Stickies in General.

Vangelis13 said:
I hate to have to say it like that, directly, but there's no other way around it; search & read up mate!
"Now what"..? :what:
No one is gonna hold your hand and walk you through it step by step, you have to do it yourself. There are guides everywhere, check the Stickies in General.
Click to expand...
Click to collapse
True, but sometimes guides miss somethings.

thenerdal said:
True, but sometimes guides miss somethings.
Click to expand...
Click to collapse
No, they don't. The guides that you find in the Stickies are (for their purpose) complete.
It's a phone, won't bite you.. Play around a bit!

[Q] galaxy S4 random reboots

Anyone else had this / any ideas - my s4 randomly reboots. Can sometimes be when I'm using it or other times when it is sitting idle.
Sent from my GT-I9505 using xda premium

if you can go to download mode flash a new stock rom using odin . before it try with a factory reset too :laugh::laugh:

quibble8 said:
Anyone else had this / any ideas - my s4 randomly reboots. Can sometimes be when I'm using it or other times when it is sitting idle.
Sent from my GT-I9505 using xda premium
Click to expand...
Click to collapse
yup, i had this after running a custom rom for a few days. i'm sure it wasn't the rom though, i restored back to stock last night just in case, we'll see.

However, in the future, please also post your ROM, kernel, etc.
For example, having your phone OC might result in such random reboots...

okty2k said:
However, in the future, please also post your ROM, kernel, etc.
For example, having your phone OC might result in such random reboots...
Click to expand...
Click to collapse
I didn't change the kernel and I don't want to name the ROM because I'm sure it's not its fault - it was fine for a few days with plenty of reboots and activity/usage. Sounds like others on stock have the same problem (not necessarily related to the camera issue), so I've gone back to my stock backup and will see what transpires.

ch0use said:
I didn't change the kernel and I don't want to name the ROM because I'm sure it's not its fault - it was fine for a few days with plenty of reboots and activity/usage. Sounds like others on stock have the same problem (not necessarily related to the camera issue), so I've gone back to my stock backup and will see what transpires.
Click to expand...
Click to collapse
I understand you, but it is not like blaming the ROM creator. Is that you might have discovered a bug, and you can help to get it solved.
personally, the first thing I would do is to make a factory reset. This is not the case for you any more... but however.
Good luck and please tell us got things go on...

Fair enough, it was slim bean build 6 on Verizon. I reverted to my stock twrp backup last night (10hrs ago) and been fine so far...

[Q] Need some help, not sure where to find these answers.

I'll start off by giving some background information. I ordered my Nexus 4 back in March and ran stock up until about July/June. Prior to the Nexus I had the HTC G2. I don't know how to root and and use custom ROMs and I have looked at the root guide for the Nexus but it's a huge barrage of information and some terms that I don't know what they are. However, this question doesn't involve rooting. I gave my Nexus 4 to a friend, who also has the Nexus, to root for me and use a custom ROM. In this process however, he did something that he told me to never do (I really don't know why..) and he ended up soft bricking my phone. He did that because my phone was stuck on the "Google" start up screen for over 40 minutes. Basically, he wiped the entire phone, I think. Due to some issues, we are no longer on speaking terms and he was the only person I knew who knows how to deal with rooting and custom ROMs.
Now I don't have the original back up of the stock. My question is, if I ever needed to send my phone back to Google for repairs or anything else, would I be able to somehow get the phone back to it's stock state?
Also, where could I find some resources that aren't a barrage of information? When I go to those threads like the Nexus rooting guide, it's just so much information and I get lost (I don't even quite know what a ROM is, my current interpretation is an operating system). Currently, I think I know how to update the ROM, I'm currently using Paranoid Android.
I apologize if this issue of mine can easily be solved with a search. I have googled this issue numerous times and I could not really find a solid answer.

Fubs261 said:
I'll start off by giving some background information. I ordered my Nexus 4 back in March and ran stock up until about July/June. Prior to the Nexus I had the HTC G2. I don't know how to root and and use custom ROMs and I have looked at the root guide for the Nexus but it's a huge barrage of information and some terms that I don't know what they are. However, this question doesn't involve rooting. I gave my Nexus 4 to a friend, who also has the Nexus, to root for me and use a custom ROM. In this process however, he did something that he told me to never do (I really don't know why..) and he ended up soft bricking my phone. He did that because my phone was stuck on the "Google" start up screen for over 40 minutes. Basically, he wiped the entire phone, I think. Due to some issues, we are no longer on speaking terms and he was the only person I knew who knows how to deal with rooting and custom ROMs.
Now I don't have the original back up of the stock. My question is, if I ever needed to send my phone back to Google for repairs or anything else, would I be able to somehow get the phone back to it's stock state?
Also, where could I find some resources that aren't a barrage of information? When I go to those threads like the Nexus rooting guide, it's just so much information and I get lost (I don't even quite know what a ROM is, my current interpretation is an operating system). Currently, I think I know how to update the ROM, I'm currently using Paranoid Android.
I apologize if this issue of mine can easily be solved with a search. I have googled this issue numerous times and I could not really find a solid answer.
Click to expand...
Click to collapse
Is the phone booting into PA? If not try holding the power button and the volume down at the same time. It should boot into recovery. If it does all you need to do is flash a rom "install a os".
Sent from my Nexus 4 using xda app-developers app

Tunderpimp said:
Is the phone booting into PA? If not try holding the power button and the volume down at the same time. It should boot into recovery. If it does all you need to do is flash a rom "install a os".
Sent from my Nexus 4 using xda app-developers app
Click to expand...
Click to collapse
Ohh yes, I should clarify. Currently the phone is working and I have it up to date on Paranoid Android. The only issue I had when updating Paranoid Android was that I could not use the kernel my friend had supplied me with (I think it was the Franco kernel). When I would flash the kernel, it would get stuck on the Google logo screen. I would have to get out of that by re-flashing Paranoid Android again and I've been unsuccessful in flashing any kernels. The main reason I wanted to root my phone was a custom kernel, to help with battery life.
My main question is that I wanted to know if I could ever get it back to stock (as to not void a warranty) if I were to ever need to for any reason.

Fubs261 said:
Ohh yes, I should clarify. Currently the phone is working and I have it up to date on Paranoid Android. The only issue I had when updating Paranoid Android was that I could not use the kernel my friend had supplied me with (I think it was the Franco kernel). When I would flash the kernel, it would get stuck on the Google logo screen. I would have to get out of that by re-flashing Paranoid Android again and I've been unsuccessful in flashing any kernels. The main reason I wanted to root my phone was a custom kernel, to help with battery life.
My main question is that I wanted to know if I could ever get it back to stock (as to not void a warranty) if I were to ever need to for any reason.
Click to expand...
Click to collapse
which franco kernel, was it compatibke with your rom? i mean are you on android 4.3 and the kernel 4.2.2(or vice versa)? when you flashed the kernel, did you flash with the rom then boot up, or did you just flash the kernel alone? did you try redownloading the kernel, maybe a bad download? was it a jss kernel or a jwr kernel?

Fubs261 said:
My main question is that I wanted to know if I could ever get it back to stock (as to not void a warranty) if I were to ever need to for any reason.
Click to expand...
Click to collapse
Yes you can.
Read the guides as slowly as you need to...stopping to research anything you don't understand...
Or just use those no brainer toolkits that teach you nothing.
And stick to stock until you know what's going on within your device when you do these things.

simms22 said:
which franco kernel, was it compatibke with your rom? i mean are you on android 4.3 and the kernel 4.2.2(or vice versa)? when you flashed the kernel, did you flash with the rom then boot up, or did you just flash the kernel alone? did you try redownloading the kernel, maybe a bad download? was it a jss kernel or a jwr kernel?
Click to expand...
Click to collapse
I'm not sure what version it was, I guess that might have been the issue. Would that have caused it to stay on the Google logo screen? I'll make sure to double check for that next time I try to do something.
studacris said:
Yes you can.
Read the guides as slowly as you need to...stopping to research anything you don't understand...
Or just use those no brainer toolkits that teach you nothing.
And stick to stock until you know what's going on within your device when you do these things.
Click to expand...
Click to collapse
Thank you for answering. Could you link a good starter thread for me? I was hesitant to use a custom ROM or even to root my phone. What compelled me to do it was the kernels extending battery life. Because I was so lost and felt overwhelmed, I had my friend help me but now we are no longer on talking terms so I'm lost.
Again, I wish to apologize, I know I should just look this up myself, but with the possibility of bricking/soft-bricking my phone, I want to get as much help as possible. Whatever small nudge, I will take.

Your questions can be answered by reading the stickies thread in the general section. Just follow the instructions to flash back to factory stock:
http://forum.xda-developers.com/showthread.php?t=2010312
If you flash a kernel and the phone won't boot, that kernel or version of the kernel isn't compatible with that rom or particular version of Android.
sent from xda premium app
---------- Post added at 06:09 AM ---------- Previous post was at 06:06 AM ----------
Fubs261 said:
Because I was so lost and felt overwhelmed, I had my friend help me but now we are no longer on talking terms so I'm lost.
Click to expand...
Click to collapse
I hope it's not because he messed up your phone, it's not his fault that you trusted him to do it in the first place. If not, well nevermind.
sent from xda premium app

It's very simple to get it back to stock. You'd just need to find a copy of the stock Rom (which I can assure you is probably on this very website floating around somewhere) and flash it in recovery like you would any other Rom.
Sent from my 16GB Blue Verizon Galaxy S3 running MIUI v5 with KT kernel
---------- Post added at 03:14 AM ---------- Previous post was at 03:12 AM ----------
Also keep in mind, custom roms usually come with custom kernels. So you shouldn't even have to worry about kernel flashing. If you want to preserve battery you should focus more on under clocking and thermal throttling...
You can find guides on here somewhere for that too...
Sent from my 16GB Blue Verizon Galaxy S3 running MIUI v5 with KT kernel

Stock 4.4.2 kernel

Hello everyone! Could anyone help me out and share a stock d802 int 4.4.2 kernel? (flashable .zip maybe?)
Been using this phone for 5 months already and yesterday I decided to try out autorec recovery and dorimanx kernel. Regret doing that. Performance seems to be lower, the same goes with battery life.
Is there even a way of getting back to stock without full wipe?
Sorry if I haven't done enough searching, but I'm on phone and searching this way is a pain in the ...
Sent from my LG-D802 using XDA Premium 4 mobile app

archzz said:
Hello everyone! Could anyone help me out and share a stock d802 int 4.4.2 kernel? (flashable .zip maybe?)
Been using this phone for 5 months already and yesterday I decided to try out autorec recovery and dorimanx kernel. Regret doing that. Performance seems to be lower, the same goes with battery life.
Is there even a way of getting back to stock without full wipe?
Sorry if I haven't done enough searching, but I'm on phone and searching this way is a pain in the ...
Sent from my LG-D802 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I am not completely sure, but doesn't Autorec install the stock kernel (patched only for loki etc).
Thread title asks just for the Stock Kernel and since you have already a custom recovery , you would need a patched kernel. Doesnt have to be Dorimax.
Or really completely stock with everything and unroot?

Oh, I'm sorry. I meant I want things to go back the way they were - stock 4.4.2, stock kernel, no custom recovery. Is it even possible without a complete reinstall and wipe?
PAGOT said:
I am not completely sure, but doesn't Autorec install the stock kernel (patched only for loki etc).
Thread title asks just for the Stock Kernel and since you have already a custom recovery , you would need a patched kernel. Doesnt have to be Dorimax.
Or really completely stock with everything and unroot?
Click to expand...
Click to collapse

archzz said:
Hello everyone! Could anyone help me out and share a stock d802 int 4.4.2 kernel? (flashable .zip maybe?)
Been using this phone for 5 months already and yesterday I decided to try out autorec recovery and dorimanx kernel. Regret doing that. Performance seems to be lower, the same goes with battery life.
Sent from my LG-D802 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
when installing a new kernel you should never judge by one day, you should always allow 2-3 days for everything to fall in place, saying the above is like installing a new rom and if in few hours its draining fast you blame the rom but in reality you didn't give things a chance to fall in place and run as they are supposed to
archzz said:
Oh, I'm sorry. I meant I want things to go back the way they were - stock 4.4.2, stock kernel, no custom recovery. Is it even possible without a complete reinstall and wipe?
Click to expand...
Click to collapse
only way to go back to complete stock without consequences is by using download mode

XxZombiePikachu said:
when installing a new kernel you should never judge by one day, you should always allow 2-3 days for everything to fall in place, saying the above is like installing a new rom and if in few hours its draining fast you blame the rom but in reality you didn't give things a chance to fall in place and run as they are supposed to
only way to go back to complete stock without consequences is by using download mode
Click to expand...
Click to collapse
So you mean to say It's ok that it takes like 4 sec to show mobile data settings (long press on mobile data icon)? That's an example. And also I don't know much about benchmarks but the I/O score in quadrant went down to 5200ish.

archzz said:
So you mean to say It's ok that it takes like 4 sec to show mobile data settings (long press on mobile data icon)? That's an example. And also I don't know much about benchmarks but the I/O score in quadrant went down to 5200ish.
Click to expand...
Click to collapse
Benchmarks don't matter and it doesn't take 4 seconds for me.
Sent from my LG-D802

Trixanity said:
Benchmarks don't matter and it doesn't take 4 seconds for me.
Sent from my LG-D802
Click to expand...
Click to collapse
Thanks for your help.
It does take for me, it wasn't like that with stock so I want to go back to stock.
Im not blaming the kernel dorimanx made, maybe I just need a wipe or something, but I can't afford to do a full wipe.

archzz said:
Thanks for your help.
It does take for me, it wasn't like that with stock so I want to go back to stock.
Im not blaming the kernel dorimanx made, maybe I just need a wipe or something, but I can't afford to do a full wipe.
Click to expand...
Click to collapse
well naturally for flashing a kernel you wipe dalvik/cache and I mentioned earlier if you want to go back to stock you would need to use back to stock guide which will erase everything on your phone so backup anything important

So I guess there is no way of restoring kernel and recovery without wipe?
Sent from my LG-D802 using XDA Premium 4 mobile app

archzz said:
So I guess there is no way of restoring kernel and recovery without wipe?
Sent from my LG-D802 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Well there is fastboot mode but that is dangerous and shouldn't be done on purpose
Sent from LG-G2 D800 on AEONFLEX 4.4.2

archzz said:
Hello everyone! Could anyone help me out and share a stock d802 int 4.4.2 kernel? (flashable .zip maybe?)
Been using this phone for 5 months already and yesterday I decided to try out autorec recovery and dorimanx kernel. Regret doing that. Performance seems to be lower, the same goes with battery life.
Is there even a way of getting back to stock without full wipe?
Sorry if I haven't done enough searching, but I'm on phone and searching this way is a pain in the ...
Sent from my LG-D802 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I had the same issue and fixed by flashing this: http://forum.xda-developers.com/showpost.php?p=52182215&postcount=449