Database Users

Undervolting?

I do it on my laptop, was wondering if I can do it on my phone to save power?
I looked aound a bit and everyone seems vey focused on overcloking. I don't have a problem with the 1Ghz speed, was ust wondering if I can stay at that speed and save some juice and if it' safe.

Yes you can. Get one of the apps off the market either unstable apps or jrummy. I use the unstable version to under clock from stock down to values of 50, 43, 36, 25. Which is quite a lot lower I think.
Sent from my DROIDX using XDA App

The apps are only .99 -so you can't go wrong with 'em. But I like learning this stuff and tinkering. So you may have already checked out this thread...
http://forum.xda-developers.com/showthread.php?t=812749
It is about overclocking- but you can use the same information to underclock. You just need the overclock.ko file and then adjust the setscaling.sh file so that it uses lower vsels.
I did a little write up in that thread...
http://forum.xda-developers.com/showpost.php?p=8771591&postcount=43
so if you want to check into- once you fool around with it a bit- it is not that hard. I now actually have 3 scripts I can run. 1 for stock clock speeds undervolted. 1 for stock speed stock voltage. and 1 for high voltage clocked to 1.3mhz.
good luck.

it has definitely been a great mod to my phone. I'm running stock speeds and ULV. Battery life has been phenomenal.

Aggie12 said:
it has definitely been a great mod to my phone. I'm running stock speeds and ULV. Battery life has been phenomenal.
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Care to post the file you are using?
Sent from my DROIDX using XDA App

The stock vsel is 56, right? I've tried going down to 54 and the stress test in set CPU goes well for 5 minutes. At some point between 5 and 10 minutes I get an error.
Is that normal and I should go with 54 or should the test last a lot longer without an error? Or is the stock vsel higher?
Sent from my DROIDX using XDA App

coolj478 said:
The stock vsel is 56, right? I've tried going down to 54 and the stress test in set CPU goes well for 5 minutes. At some point between 5 and 10 minutes I get an error.
Is that normal and I should go with 54 or should the test last a lot longer without an error? Or is the stock vsel higher?
Sent from my DROIDX using XDA App
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58, 44, 33, 27 are my vsel values oc'd to 1.125. Any higher oc will slow me down to a crawl.
To answer your question, I think stock vsel is 62 on Froyo.

I have been running the Ultra low voltage 1.3ghz preset from jrummy's app for a couple of weeks now with zero stability problems. Improved my battery by about 15-20 percent. I have seen warnings about stability with ultra low voltage but I guess I got lucky. Low 18's in Linpack and upper 1600 quadrants.

@aggie12 Care to share your vsel numbers? Im doing the same stock cpu speed just undervolted but I have hardly noticed a difference in battery life. How many hrs does your phone last in average use?
Sent from my DROIDX using XDA App
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I typically get 36 hours before I get nervous at 20%. This is without juice defender, just straight 1ghz use on regular battery manager
From my Droid X with love...

@aggie12 Care to share your vsel numbers? Im doing the same stock cpu speed just undervolted but I have hardly noticed a difference in battery life. How many hrs does your phone last in average use?
Sent from my DROIDX using XDA App

Daali said:
I typically get 36 hours before I get nervous at 20%. This is without juice defender, just straight 1ghz use on regular battery manager
From my Droid X with love...
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How is 36s hours even possible? I get around 10-12 hours of use, but I'm a heavy phone user...
Also, is it possible to undervolt using setCPU?

DawidD said:
How is 36s hours even possible? I get around 10-12 hours of use, but I'm a heavy phone user...
Also, is it possible to undervolt using setCPU?
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No- set cpu only adjust your clock speeds- not the amount of power the phone is drawing to obtain those speeds. The .99 apps will allow for undervolting though. Or if you do a little study on the OverClock thread- it is not to hard to do with a script.

@Daali What are your vsel numbers? Mine are:
1ghz/45vsel
800/40
600/30
300/18
I get only 12 hrs of heavy use.
Sent from my DROIDX using XDA App

^^ siphen^^i just set this i'll start my test 2/marrow after I unplug for the day. I have extended battery mild user mainly txt/mms/no more than 30 min a day calling but i do surf sites quite often and wifi is on 24/7 as I have it at work and home> i'll let you know how those work for me.

Best battery life kernel on sense rom?

Hey guys, in your opinion what gives the best battery life on a sense ROM like Mikshift? BC's 1.5GHz, 1.8GHZ or X99, Scary Kernel, ect. Just curious what some of your experiences are..

PaulB007 said:
Hey guys, in your opinion what gives the best battery life on a sense ROM like Mikshift? BC's 1.5GHz, 1.8GHZ or X99, Scary Kernel, ect. Just curious what some of your experiences are..
Click to expand...
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I have been running mikshift since the beta along with bcnice20 oc uv 1.5 kernel with amazing battery life, if I forget my charger I don't even worry the standby time of that set up is just amazing ran for 24 hours on wifi with about 5 hours of using the net,tapatalk and about 75 texts and was at 50% at 24 hours of being unplugged its the only setup ill run, sometimes ill throw the 1.8 on there just to show everyone I can go that high but its never needed. I run at 1516 max 368 min conservative with a screen off profile for 806 max and 368 min no complaints here at all!! Its actually the only setup I'm willing to run!
Sent from my PG06100 using Tapatalk

Go with the x99 kernel without changing any settings. Just flash and leave it alone. Easy 2 days like that
Sent from my PG06100 using Tapatalk

[Q] [Opinions] Undervolt Settings.

First off, I would like to apologize in advance in case a thread like this exist and I can't find it.. :/ (Search is down, tried Googling) also, if anyone believes this to be in the wrong forum.
ANYWAYS! This is intended to be a preference/opinions thread centering around your OC/UC and Undervolt settings. Feel free to post your current set-up in Voltage Control (or any app of the like) and what Kernel you are running! I wanted to start this to get an idea of what everyone else is setting their UV and CPU clocks to, and possibly give a few of them a try on my own device. :]
Personally all of my clock speeds are at their defaults except for 1000Mhz @ 1200mV. (-75mV). I am also rocking Genocide v1.0 and getting a decent 30hrs of battery life with pretty moderate use.
Post away!

It is kind of pointless since every phone is different so cannot do exactly the same as others. Most can't do 1.4Ghz and most don't wake from sleep at 100 Mhz. All depends what you use your phone for. Mine runs fine at 1.3Ghz except for some TV apps will freeze.
Do you BONSAI?

kennyglass123 said:
It is kind of pointless since every phone is different so cannot do exactly the same as others. Most can't do 1.4Ghz and most don't wake from sleep at 100 Mhz. All depends what you use your phone for. Mine runs fine at 1.3Ghz except for some TV apps will freeze.
Do you BONSAI?
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I believe that would be my point however.. curious as to what other people are running as far as cpu and voltage is concerned. Their success and failures. What people can get away with and remain stable. I, and others, could then try their setup (taking precautions of course; ie Nandroid backup.) And see what we get. Who knows, maybe I might adapt a set up that runs better on my device than my current one.
Sent from my SPH-D700 using XDA Premium App

Yes, every phone is different, but that is just more of a reason to collect data - perhaps a baseline can be established, which would be helpful in determining if a particular phone is messed up or just at the low end of the scale. Right now it is hard to determine if a particular phone's troubles are caused by low quality or by damaged hardware.
I keep all voltages at stock, and don't use any OC - my phone runs fine as is, and the battery life actually seemed worse with UV (and my screen felt hot with the screen UV).
Sent from my SPH-D700 using XDA App

My phone wakes from 100 but won't do 1.4ghz for even a couple seconds before reboot but 1.3ghz lasts about 20 minutes before reboot and 1.2ghz is stable. As for undervolts it can handle -25 on 1.2ghz and -50 on 1 and 1.1ghz -50 on 800mhz and that's it otherwise becomes unstable and reboots. Battery life and performance seem to meet at 800mhz with a -50 undervolt games run smooth too and 12 hours of battery. Oddly enough benchmarks are consistantly higher on 1.12ghz than on 1.2ghz I wonder if I'm the only one?
Sent from my midnight rom 5.2 genocide 1.0 epic [email protected] using xda premium app

xopher.hunter said:
My phone wakes from 100 but won't do 1.4ghz for even a couple seconds before reboot but 1.3ghz lasts about 20 minutes before reboot and 1.2ghz is stable. As for undervolts it can handle -25 on 1.2ghz and -50 on 1 and 1.1ghz -50 on 800mhz and that's it otherwise becomes unstable and reboots. Battery life and performance seem to meet at 800mhz with a -50 undervolt games run smooth too and 12 hours of battery. Oddly enough benchmarks are consistantly higher on 1.12ghz than on 1.2ghz I wonder if I'm the only one?
Sent from my midnight rom 5.2 genocide 1.0 epic [email protected] using xda premium app
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Click to collapse
Just to throw it out there. Aggressive undervolts will do more harm than good to your battery life. By that, I mean you'll drain your battery even more.
Sent from my SPH-D700 using XDA Premium App

I can only use Genocide kernel to get 1.3ghz at stock voltage with since all the other choices are uv'd. My last two Epics were able to handle uv'd 1.4ghz by 50mV but I'm not really complaining as I think this is a new phone they gave me and not a refurb. I currently have 100-400 uv'd by 100mV, 600-1000 uv'd by 75mV and 1300 at stock.

My phone can handle 1.4 Ghz but only with the stock voltages. If I try to touch it even by 25mV it locks up.
Who all has enabled the 100Mhz step? I noticed when I did my phone went into Deep Sleep a lot less by a noticeable amount. Staying at 100Mhz a lot.

Always interesting to hear about all this theory behind the reasons for undervolting OC and UC, then to hear about the issues (at times extreme) some have. I would also like to know who uses the 100 step and if it is noticeably better on battery life than the 200? Unfortunately I am missing out on it if I am. Still running Genocide here, but with 1.0 at -50mv 800 @ -50 and 600 @ -25. Very stable and still at 30+ battery life. Having 1.0 down 75 made me nervous. although I hear people dropping it down -100mv successfully.
Sent from my SPH-D700 using XDA Premium App

Good tip about "aggressive UnderVolting"...didn't know that actually drains your battery more. Might explain why 6 hours into my day, my battery is down to 30% already!!! I had it set at 1120Mhz UV to 1175mV (Stock = 1300)...
So now I'm going to try 1200Mhz only UV by 50...see what my battery life is after this!

Custodian said:
Just to throw it out there. Aggressive undervolts will do more harm than good to your battery life. By that, I mean you'll drain your battery even more.
Sent from my SPH-D700 using XDA Premium App
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Click to collapse
Can you explain how this is so? Is this based on any actual research, experimentation, or online documentation, or is this just your own opinion?
Unless your undervolt causes the CPU to hang (I've seen mine start to warm up when it's hung, until a battery pull), I don't understand how providing less voltage to the cpu will cause it to drain the battery faster.

If you change the voltage settings please don't blame the rom developers when you phone bricks...
Sent from Bonsai 7.1.3.1

I'm running Twilight Zone v 1.1.1 RC1-Hajime Taisho, Vision kernel v 1.2
SetCpu-1.450 max
-1.450 min
Quadrant-2377
Linpack-20.577
Voltage Control-1.450
Uv -100
Quadrant-2346
Linpack-21.495
I ran SetCpu, benchmarks, ran VC, benchmarks..... This Epic runs super fast, with no FC's or any other problems at all. I'm currently using VC with the uv-100. As far as excessive battery use, I have Mugen 3200 mah battery. This battery lasts all day in heavy use with no problem.
Sent from my SPH-D700 using XDA Premium App

800mhz is enough

Quick, and great battery. Overclocking is pointless unless you play games on your phone, or care about your quadrant score.
Sent from my Nexus S 4G using XDA App

Yup, I agree with you

+1
I had a Milestone for 1.5 years on stock ROM (that is 550Mhz), pretty much served most of my needs perfectly....you know, the normal stuff you use your phone for.

I rarely notice my phone is underclocked... with smartass governor, it's more responsive than stock clocks with a less responsive governor.
Battery life doesn't seem improved, but I know that my weak signal is causing the problem here.

synaesthetic said:
I rarely notice my phone is underclocked... with smartass governor, it's more responsive than stock clocks with a less responsive governor.
Battery life doesn't seem improved, but I know that my weak signal is causing the problem here.
Click to expand...
Click to collapse
I Sunni it's different for me.. When in use it seems to drain about the same but last night I set the phone down around 11 worth 84% battery life and got up at 6 with 78% still and that's setting the governor to smartass

It's bad for me because my phone goes without signal about half the time in my apartment. I'll be moving soon so it's not a huge issue, but it is kind of disconcerting to feel my phone heating up from just sitting around doing nothing.

synaesthetic said:
It's bad for me because my phone goes without signal about half the time in my apartment. I'll be moving soon so it's not a huge issue, but it is kind of disconcerting to feel my phone heating up from just sitting around doing nothing.
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Click to collapse
You could try disabling the governor and let one like, setcpu do it? Before I went Incredikernel I set up a profile in setcpu that whenever my screen was off it wouldn't run any faster then 128MHz but when on was set for either on demand or performance. Using two governors at the same time causes lag I've found so you'd have to be running a rom that doesn't already have one (that you can see and change) built in

Yea, this is true. OC'ing I thought it was giving me speed, but I actually took the time to really see the speed on OC'ing and to me it dosent seem to change. Well maybe alittle bit, but still. But yea, so I just hit 1ghz and I just leave it there.
Pete's latest w/Yennob-Base2 kernel at 1ghz and its going good.

kijp15 said:
Yea, this is true. OC'ing I thought it was giving me speed, but I actually took the time to really see the speed on OC'ing and to me it dosent seem to change. Well maybe alittle bit, but still. But yea, so I just hit 1ghz and I just leave it there.
Pete's latest w/Yennob-Base2 kernel at 1ghz and its going good.
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Click to collapse
Yeah I honestly can't tell a difference between running at 998 MHz and 1,113 MHz other than a physically hotter phone and faster battery loss lol

IAmTheOneTheyCallNeo said:
Yeah I honestly can't tell a difference between running at 998 MHz and 1,113 MHz other than a physically hotter phone and faster battery loss lol
HTC-Incredible on Android 2.3.5
CyanogenMod-7 Nightly (8/18)
Chad's Incredikernel-GB #9 (SA)
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Click to collapse
Ahaha, yea. Everytime I would hit 1.3ghz or 1.4ghz for the fun of it, my phone would get that way too. It would get hot and it feels like it would explode in my face and yea battery life would drop like crazy.

Personally, I find myself running into a wall with RAM more than with processor power. I really hope the next Nexus at least doubles it.

No problems with overclocking: http://forum.xda-developers.com/showpost.php?p=16791637&postcount=124

Well the SuperOSR is only for nexus s.. If there was one for the ns4g, well then after reading that, I would be OC'ing like a maniac.

zorak950 said:
Personally, I find myself running into a wall with RAM more than with processor power. I really hope the next Nexus at least doubles it.
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Click to collapse
This. I'm really feeling the loss of RAM coming from a mytouch 4G. That extra 256MB really made a difference. Using juwe's RAM optimization script seems to help, though.

Ehm, how can Ram be a problem?
Android is managing it itself and can't run out of it, usually.
Sent from my Nexus S using XDA App

rentaric said:
Ehm, how can Ram be a problem?
Android is managing it itself and can't run out of it, usually.
Click to expand...
Click to collapse
Things get killed that you don't want getting killed, and when it starts to run low things slow down considerably. It's not that something won't run, but it may run badly, or cause other apps to close that you were multitasking on, which is inconvenient.

I average 16 hours with normal for me use, which is a lot of texting, Facebook, internet browsing, listening to music.
Sent from my Nexus S 4G using XDA App

Skimp Killah said:
I average 16 hours with normal for me use, which is a lot of texting, Facebook, internet browsing, listening to music.
Sent from my Nexus S 4G using XDA App
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How so? I normally get around 9-10 hours max with moderate use, also depending on the signal i get half the time.

I use netarchys latest bfs kernel with proton to undervolt all CPU frequencies to -20mv. And I have the CPU limited to 100-800mhz, with the on demand governer. With those 2 thing I get 15-16 hours everyday. I also usually let my batter get down to atleast 5% before charging.
Sent from my Nexus S 4G using XDA App

Skimp Killah said:
Quick, and great battery. Overclocking is pointless unless you play games on your phone, or care about your quadrant score.
Sent from my Nexus S 4G using XDA App
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it's true
i always Under clock the phone with SetCPU to save battery life

Overclocking and battery

I'm wondering what is the battery life difference between 1000MHz (as max) and overclocked 1400MHz?
In most [low-end] phones little OC consumes a lot of power, but I don't see this issue in SGS.
Are you using your phone overclocked? How long last your battery?

opt1user said:
I'm wondering what is the battery life difference between 1000MHz (as max) and overclocked 1400MHz?
In most [low-end] phones little OC consumes a lot of power, but I don't see this issue in SGS.
Are you using your phone overclocked? How long last your battery?
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Click to collapse
I dont know why would you do that... I use SGS in max 800mhz(underclocked) and its perfectly fast... But regarding your question, prolly would be about a day and a half of battery with those settings on OC.

I think its perfectly fast as it is but to your question ... i think it really depends on how you use it i dont belive it will last more than a day of it is used as intended ...

Gonzas10 said:
I dont know why would you do that... I use SGS in max 800mhz(underclocked) and its perfectly fast... But regarding your question, prolly would be about a day and a half of battery with those settings on OC.
Click to expand...
Click to collapse
I tried underclocking my SGS (aokp build 28) to 800mhz, and it crawled, never got to the first unicorn in past the boot animation. seriously.

I over locked up to 1200, no over volt. Don't feel any impact on batterry since phone is only less 1 percent of time in that CPU state.Rest of time it is idling.
Sent from my GT-I9000 using xda premium

im running SGS with 1000MHz and i don't need more power on my phone :S

Not much diff actually
Sent from my GT-I9100 using XDA

there can be a difference in battery life, but there does not necessarily have to be one I assume... after all, it is only the maximum available for the processor, most of te time it will not run at that speed... I for one do not overclock my phone (actually, I have underclocked it to 800mhz) since I have no need for these speeds (just using my phone for messaging and some browsing)...
please correct me if I am wrong since I do not know much about how the SGS processor exactly works

i cant see how it shouldnt impact battery.