Develop Bugs

[Q] Better battery life (Kernel Confusion)

Recently i've ventured into kernel threads wondering how i can get better battery life on my G2. I consider myself pretty well versed in roms but Kernels are a whole new animal for me.
I have read so many threads im becoming dizzy. If i have to flash a kernel for better battery, which one? I dont have demands for a faster phone. Most of the threads about kernels i have read are all about getting a faster clock. Im fine with the speed of my G2. I just want better battery.
Can some one provide me with some literature on the subject, point me in the right direction, or even better, answer some questions for a noob in this particular subject??
What Kernel to use?
Can i flash over CM 6.1 Stable?
Do i need to wipe before flash?
Any assistance will surely allow me to sleep better at night.
Thank you in advance.

I can tell you im running virtuous 7.2 i find pershoots kernel the best for battery.
Sent from my HTC Vision using XDA App

shortlived said:
I can tell you im running virtuous 7.2 i find pershoots kernel the best for battery.
Sent from my HTC Vision using XDA App
Click to expand...
Click to collapse
If you want great battery life, don't use a sense rom. They're battery hogs as it is. Stay on CM 6.1 and flash pershoots latest kernel. Get setcpu and set a profile to 245/245 when the screen is off.
With these settings I get awesome battery life and I'm overclocked to 1497.
Sent from my HTC Vision using XDA App

rp1783 said:
If you want great battery life, don't use a sense rom. They're battery hogs as it is. Stay on CM 6.1 and flash pershoots latest kernel. Get setcpu and set a profile to 245/245 when the screen is off.
With these settings I get awesome battery life and I'm overclocked to 1497.
Sent from my HTC Vision using XDA App
Click to expand...
Click to collapse
Oh ya i learned through trial and error to stay away from sense roms.
Can i ask you why you overclock? I dont find myself in any moments where i think the phone should be going faster.
I can flash pershoots over cm with no problems?
Can i get a link?
thanks for the response.

Well i lpike sense but only when its ocd sense too sluggish on stock g2 speeds. Also even with ocing and runing sense my bat last just about all day. It sometimes needs a shot a juice if im useing gps or playing a lot of games but thats it.
Sent from my HTC Vision using XDA App

Decent battery life on my G2.
I'm running htc sence on mine with the pershoot kernal and cpu tuner.I have tweaked profiles and my battery life is better than b4.Example, i took it off the charger(ac) yesterday morning @ about 9:20am & today Thur, i checked the [email protected] 11:50am and my battery is only @ 40%.(1 day,3hrs & 31min's later)not bad.That's WITH moderate use.

Utorrent76 said:
I'm running htc sence on mine with the pershoot kernal and cpu tuner.I have tweaked profiles and my battery life is better than b4.Example, i took it off the charger(ac) yesterday morning @ about 9:20am & today Thur, i checked the [email protected] 11:50am and my battery is only @ 40%.(1 day,3hrs & 31min's later)not bad.That's WITH moderate use.
Click to expand...
Click to collapse
So whats CPU Tuner? Do you have some suggestions for how to tweak the profile? Can i get a link to the pershoots thread? Is this the right thread? --> http://forum.xda-developers.com/showthread.php?t=847672
Do I have to wipe before flashing and then reinstall cm over it?
When I went into SetCPU, it always kinda confused me. That could be why I was never interested in overclocking.
I realize I have a lot of questions. Im just a careful and thorough person.

Simple.
@dangabob13...Don't worry about all the questions i'd want to b super carefull as well.First, cpu tuner is a free app in the market much like set cpu except u get more options as far as customizing your profiles.Second you can find the pershoot kernel right with in rom manager.Just go to the download rom section & its the 3rd one down.I didn't wipe and i haven't had any problems.The reason i switched to the pershoot kernel was because i was having problems waking up the screen with HTC sense and the kernel it came with.This fixed the issue for me.No need to b confused it's actually pretty simple.My profiles for cpu tuner are as follows:
Under the "Current" tab: i have the governor set to "conservative" i have the cpu o.c to 1094 MHZ.No need to go crazy over clocking i find this to b fast enough for now. The rest of my profiles:under the "profiles"tab,
Performance:Ondemand-Max:1094 Ghz,Min:768Mhz.
Good:Conservative-Max:1094Ghz,Min:768Mhz.
Normal:Conservative-Max:1094Ghz,Min:768Mhz.
Power save:Conservative-Max:1094mhz,Min:768Mhz.
Screen off:Conservative-Max:768Mhz,Min:768Mhz.
Extreme Power save:Conservative-Max:768Mhz,Min:768Mhz.
Keep in mind i also have wifi,blutooth,sync all disabled as well.I'm not saying this is guaranteed to work for you, I'm simply stating what works for me. Good luck i hope this helps.

Quick question....doesn't CM6.1 Stable have the pershoot kernel already? Also does the Pershoot kernel the one that goes to 1.8Mhz?
Not that I'm interested in going that high, but just wondering.
I OC for games mainly, but also to watch tv and movies, the extra umph really helps. My setup on SetCPU are:
Temp>40.2*C 368 / 245 Powersave Priority 100
Screen Off 245 / 245 Powersave Priority 90
Charging/full 1497 / 245 Interactive Priority 85
Battery<10% 268 / 245 Conservative Priority 80
Battery<30% 806 / 245 Conservative Priority 70
Hope this helps.

Utorrent76 said:
@dangabob13...Don't worry about all the questions i'd want to b super carefull as well.First, cpu tuner is a free app in the market much like set cpu except u get more options as far as customizing your profiles.Second you can find the pershoot kernel right with in rom manager.Just go to the download rom section & its the 3rd one down.I didn't wipe and i haven't had any problems.The reason i switched to the pershoot kernel was because i was having problems waking up the screen with HTC sense and the kernel it came with.This fixed the issue for me.No need to b confused it's actually pretty simple.My profiles for cpu tuner are as follows:
Under the "Current" tab: i have the governor set to "conservative" i have the cpu o.c to 1094 MHZ.No need to go crazy over clocking i find this to b fast enough for now. The rest of my profiles:under the "profiles"tab,
Performance:Ondemand-Max:1094 Ghz,Min:768Mhz.
Good:Conservative-Max:1094Ghz,Min:768Mhz.
Normal:Conservative-Max:1094Ghz,Min:768Mhz.
Power save:Conservative-Max:1094mhz,Min:768Mhz.
Screen off:Conservative-Max:768Mhz,Min:768Mhz.
Extreme Power save:Conservative-Max:768Mhz,Min:768Mhz.
Keep in mind i also have wifi,blutooth,sync all disabled as well.I'm not saying this is guaranteed to work for you, I'm simply stating what works for me. Good luck i hope this helps.
Click to expand...
Click to collapse
I dont have a conservative option under the Governor dropdown. is that important. Otherwise i duplicated your settings. Boasting 27 hours of up time and 40% left is bound to make me jealous ill test it out. Thanks again.

That's strange is your cpu tuner app up to date? I also wanted to mention that my screen brightness is set to 20%,heptic feed back is turned off and so is vibration. Along with a few other battery saving options you should see a difference in battery life.Obviously results will vary.

Utorrent76 said:
That's strange is your cpu tuner app up to date? I also wanted to mention that my screen brightness is set to 20%,heptic feed back is turned off and so is vibration. Along with a few other battery saving options you should see a difference in battery life.Obviously results will vary.
Click to expand...
Click to collapse
Ha its so funny. I have the same exact settings. i took a look around and turned off all that stuff. I keep my GPS on because it only uses battery when its being used. But i turn off wireless locations so that its not always trying to centralize my location.

[Q] cm7 and setcpu update

[Q] cm7 cpu setting or setcpu?
well atm i am running an evo 4g with cm7 and i just switched my kernel to savaged zen and it's running great. my phone was rebooting on its own w/ the regular cm7 kernel i think its b/c i was using setcpu and people are saying it messes up cm7.
so i was wondering if anyone knew if i can use setcpu with cm7 and savaged as the kernel or if it's possible to make profiles on the cpu settings on cm7 i saw some1 post somewhere that you can but they never explained how.
p.s. please also visit this thread on battery life

AFirst of all, all SavagedZen kernels are Havs kernels (as far as I remember, I'll double check in a few). Anyway, if you are using a Havs kernel, changing cpu settings is pointless/counteractive. I would either leave the settings alone or switch to a no-havs kernel. You can check in settings>about phone.
EDIT: However, if you must mess with the settings, you can find them in Cyanogenmod Settings under Performance Settings. I don't know of a way to set profiles from that screen, though - only max/min & governor.

hi i have an evo running cm7 and i had setcpu and my phone kept restarting however i looked up setcpu again in the market and it said that they just ran an update to stop the problem with cm7, does this mean that setcpu is better to use than the cpu setting in cm7?

Green_Arrow said:
hi i have an evo running cm7 and i had setcpu and my phone kept restarting however i looked up setcpu again in the market and it said that they just ran an update to stop the problem with cm7, does this mean that setcpu is better to use than the cpu setting in cm7?
Click to expand...
Click to collapse
You shouldn't need setcpu use the cpu setting in cm7. They put it there for a reason, those guys are sharp!

I still use setcpu because I like my screen off profiles etc. You should update your setcpu if it prompted you to. I think the latest changes were for cm7/GB.
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Yes but it doesn't let u make profiles unlike setcpu, or does it?
I believe the profiles is definately the most useful
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It says it was for cm7
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I believe the SavageZen governor is a specially tweaked/optimized version of the SmartAss governor.
And if you use Smartass/SavageZen governor, I think it also automatically undervolts when sleeping, and essentially mimics what a screen-off profile in SetCPU would do.

plainjane said:
AFirst of all, all SavagedZen kernels are Havs kernels (as far as I remember, I'll double check in a few). Anyway, if you are using a Havs kernel, changing cpu settings is pointless/counteractive. I would either leave the settings alone or switch to a no-havs kernel. You can check in settings>about phone.
EDIT: However, if you must mess with the settings, you can find them in Cyanogenmod Settings under Performance Settings. I don't know of a way to set profiles from that screen, though - only max/min & governor.
Click to expand...
Click to collapse
but how exactly does havs control battery usage? and if i use setcpu wouldn't the havs not function only setcpu will function b/c of priority?

serdna75 said:
I believe the SavageZen governor is a specially tweaked/optimized version of the SmartAss governor.
And if you use Smartass/SavageZen governor, I think it also automatically undervolts when sleeping, and essentially mimics what a screen-off profile in SetCPU would do.
Click to expand...
Click to collapse
how do u use Smartass/SavageZen governor?

Threads Merged... please post your question once.

Green_Arrow said:
how do u use Smartass/SavageZen governor?
Click to expand...
Click to collapse
In CM Settings, go to Performance Settings & then CPU settings. Under available governors choose SavagedZen or Smartass. I'd try them out & see which you like the most. I prefer SavagedZen, I seem to get better battery life & performance.

egzthunder1 said:
Threads Merged... please post your question once.
Click to expand...
Click to collapse
Thanks, sorry its my 2nd day on this forum

plainjane said:
In CM Settings, go to Performance Settings & then CPU settings. Under available governors choose SavagedZen or Smartass. I'd try them out & see which you like the most. I prefer SavagedZen, I seem to get better battery life & performance.
Click to expand...
Click to collapse
thanks atm im using the savagedzen, and jw is autokiller memor optimizer useful now or not?

Green_Arrow said:
thanks atm im using the savagedzen, and jw is autokiller memor optimizer useful now or not?
Click to expand...
Click to collapse
Personally I have never needed a task killer while on CM7, so I am going to recommend against it.

Well I had talked to someone else that is using it like that and they said they get amazing battery life
Sent from my PC36100 using XDA Premium App

I say no toward any kind of task killer. First of all, they're pointless. You're killing stuff that isn't using any power to begin with, which then restarts anyway. The task killer itself is actually doing something, running on a set schedule, where as the tasks you're killing are just sitting in memory for faster opening.
It bugs me that even the techs at Sprint recommend it, so every person that doesn't know anything about how their phone works thinks it's necessary. Then in the market for every clock widget you see everyone going "like zomg the clock doesn't keep time your app sucks 1*" because the damn task killer is killing it. That's if they can even figure out how to use it & not complain that it "won't open", despite clear instructions on how to put a widget on your screen.
Sorry, totally went off on a rant there.
But yeah, stay away from task killers & let Android do its job. You don't have to have a ton of memory free for your phone to run perfectly fine under normal usage. I don't notice a difference between 300mb & 50mb free. If you don't worry about it, you won't either.
Free memory does not equal more battery.

plainjane said:
I say no toward any kind of task killer. First of all, they're pointless. You're killing stuff that isn't using any power to begin with, which then restarts anyway. The task killer itself is actually doing something, running on a set schedule, where as the tasks you're killing are just sitting in memory for faster opening.
It bugs me that even the techs at Sprint recommend it, so every person that doesn't know anything about how their phone works thinks it's necessary. Then in the market for every clock widget you see everyone going "like zomg the clock doesn't keep time your app sucks 1*" because the damn task killer is killing it. That's if they can even figure out how to use it & not complain that it "won't open", despite clear instructions on how to put a widget on your screen.
Sorry, totally went off on a rant there.
But yeah, stay away from task killers & let Android do its job. You don't have to have a ton of memory free for your phone to run perfectly fine under normal usage. I don't notice a difference between 300mb & 50mb free. If you don't worry about it, you won't either.
Free memory does not equal more battery.
Click to expand...
Click to collapse
but doesn't free memory mean less things are running or even being used just a tad bit which does mean a better battery life?

Green_Arrow said:
but doesn't free memory mean less things are running or even being used just a tad bit which does mean a better battery life?
Click to expand...
Click to collapse
No. Memory has nothing to do with battery.
Screen, radios, and CPU use battery and that's about it.
Sent from my PC36100 using XDA App

matt2053 said:
No. Memory has nothing to do with battery.
Screen, radios, and CPU use battery and that's about it.
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
So do u agree w/ system panel/juice defender?
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Cpu

Im good on everything else except when it comes the CPU thing. I have no idea what the numbers mean when you set the CPU for some reason. To slow the phones resources when the screen is off right? Can anyone point me to the direction of an app that can do this? What about an app that turns the data off once I turn the screens off. A free one. Thank you and sorry if Im not making sense or sounding dumb
Sent from my PC36100, running MIUI 1.5.13 - Tiamat-v4.0.2 using XDA Premium App.

augoza said:
Im good on everything else except when it comes the CPU thing. I have no idea what the numbers mean when you set the CPU for some reason. To slow the phones resources when the screen is off right? Can anyone point me to the direction of an app that can do this? What about an app that turns the data off once I turn the screens off. A free one. Thank you and sorry if Im not making sense or sounding dumb
Sent from my PC36100, running MIUI 1.5.13 - Tiamat-v4.0.2 using XDA Premium App.
Click to expand...
Click to collapse
SetCPU can modify the processor speed and allow you to set a profiles. However, you're running Tiamat so if you haven't changed anything your default governor is smartass which has a built in screen off profile of 128min/384max.
As far as turning data off, check out ultimatejuice. There is a free version that is limited in what it does, but it might be worth paying for. Also, for battery saving, check out my EVO link in my sig for some undervolting mods.

You can set the cpu governor with a program called setCPU on the marketplace. You can further control the CPU by flashing another kernel. What ROM are you running? Stock? I would try the netarchy kernel (newest version) if you're running a sense-based ROM.. I've found it has phenomenal battery life (medium use i get 15-20hrs) and I'm overclocked to 1.152ghz.
A program called tasker can also make your data connection go off and back on with the screen. I'm unsure how to set the profile but I do know thats possible. Try looking around here: http://tasker.wikidot.com You should be able to find something about it.
EDIT: Nevermind about netarchy, did not see your signature on your ROM and kernel.

ok, so ur on aosp and tiamat. try changing governer to smartass. will give you much better battery life, and you won't have to worry about 'numbers'.
btw the numbers are the cycles per second, or the speed the cpu works at. i personally underclock to 537 (998 is stock) to save a bunch of battery, and it still runs perfectly fine for me (cm7 with tiamat)

dkdude36 said:
ok, so ur on aosp and tiamat. try changing governer to smartass. will give you much better battery life, and you won't have to worry about 'numbers'.
btw the numbers are the cycles per second, or the speed the cpu works at. i personally underclock to 537 (998 is stock) to save a bunch of battery, and it still runs perfectly fine for me (cm7 with tiamat)
Click to expand...
Click to collapse
Governor is smartass by default on Tiamat

-viperboy- said:
Governor is smartass by default on Tiamat
Click to expand...
Click to collapse
didn't know that. thanks.

-viperboy- said:
SetCPU can modify the processor speed and allow you to set a profiles. However, you're running Tiamat so if you haven't changed anything your default governor is smartass which has a built in screen off profile of 128min/384max.
As far as turning data off, check out ultimatejuice. There is a free version that is limited in what it does, but it might be worth paying for. Also, for battery saving, check out my EVO link in my sig for some undervolting mods.
Click to expand...
Click to collapse
Thanks everybody! ....Viperboy thanks for the info unfortunately I still have lots of questions haha. And yes I already been through all the viper undervoltings, 25 through INSANE! A question I have is with those vipervoltings, I assume they'll show different results depending on which kernel and rom i'm running correct? Plus im pretty much sticking with MIUI....I usually use the 25 vipervolting. Now I'm on tiamat v4.0.3. Are you saying sense I'm using tiamat its already set to smartass, so it'll be unnecessary to use the setcpu app? Also I like savZen to what's the default governor on that? Final question, turning the data off when the screen goes off using ultimatejuice unnecessary if I'm running tiamat? Sorry for the bombarding of questions thanks again
MIUI 1.5.13 - Tiamat-v4.0.3 ​

I think you should not use SetCPU...
Just sayin'....

HipKat said:
I think you should not use SetCPU...
Just sayin'....
Click to expand...
Click to collapse
Any reason?
Sent from my PC36100, running MIUI 1.5.13 - Tiamat-v4.0.3 using XDA Premium App.

augoza said:
Thanks everybody! ....Viperboy thanks for the info unfortunately I still have lots of questions haha. And yes I already been through all the viper undervoltings, 25 through INSANE! A question I have is with those vipervoltings, I assume they'll show different results depending on which kernel and rom i'm running correct? Plus im pretty much sticking with MIUI....I usually use the 25 vipervolting. Now I'm on tiamat v4.0.3. Are you saying sense I'm using tiamat its already set to smartass, so it'll be unnecessary to use the setcpu app? Also I like savZen to what's the default governor on that? Final question, turning the data off when the screen goes off using ultimatejuice unnecessary if I'm running tiamat? Sorry for the bombarding of questions thanks again
MIUI 1.5.13 - Tiamat-v4.0.3 ​
Click to expand...
Click to collapse
Yes, most of the scripts lower by a certain range. So it all depends on the kernel you are running. Some of my scripts (Extreme, Insane, v2 scripts) specify all the voltages so no matter what kernel you're running, it sets the voltages to exact values. If you can go lower than -25 and you're stable, do it!
I find SetCPU unnecessary. I only have it installed because I use it for testing my mods and things, but I that's the only reason. But smartass is good enough for me, no other governors give me as good batter life. Defauly governor on SZ is their own governor (SavagedZen) it's based on interactive, I believe. There is more info on their site.
Tiamat (or any kernel for that matter) don't turn off 3G when the screen is off. You would need an app to do that.
augoza said:
Any reason?
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Click to expand...
Click to collapse
Uses a good bit of memory, for one. Two, because the kernels here run pretty good right out of the box.

1, it's useless, and 2, the OP seems like he isn't ready to use it.

HipKat said:
1, it's useless, and 2, the OP seems like he isn't ready to use it.
Click to expand...
Click to collapse
Well, it's definitely not useless. It's a great app, I just find no need for it other than testing my mods.

-viperboy- said:
Well, it's definitely not useless. It's a great app, I just find no need for it other than testing my mods.
Click to expand...
Click to collapse
That, I totally agree with, but for he average user, few know how to set it correctly and they end up with a placebo effect, or more problems.

HipKat said:
That, I totally agree with, but for he average user, few know how to set it correctly and they end up with a placebo effect, or more problems.
Click to expand...
Click to collapse
I couldn't agree more. Setting up a basic screen off profile with a conservative setting is useful, otherwise it actually gets in the way of already built in kernel benefits, actually undoing them in many cases. I stopped using setcpu a while ago and my battery life has not suffered at all.
ropodope
Sent from my Vaelpak 3.2 RC2 Evo 4g. Flash and ye shall receive.

-viperboy- said:
Yes, most of the scripts lower by a certain range. So it all depends on the kernel you are running. Some of my scripts (Extreme, Insane, v2 scripts) specify all the voltages so no matter what kernel you're running, it sets the voltages to exact values. If you can go lower than -25 and you're stable, do it!
I find SetCPU unnecessary. I only have it installed because I use it for testing my mods and things, but I that's the only reason. But smartass is good enough for me, no other governors give me as good batter life. Defauly governor on SZ is their own governor (SavagedZen) it's based on interactive, I believe. There is more info on their site.
Tiamat (or any kernel for that matter) don't turn off 3G when the screen is off. You would need an app to do that.
Uses a good bit of memory, for one. Two, because the kernels here run pretty good right out of the box.
Click to expand...
Click to collapse
Thanks viper!
Sent from my PC36100, running MIUI 1.5.20 - Tiamat-v4.0.3 using XDA Premium App.

[Q] MIUI Set CPU settings

Whats up guys? I have a question about using the Set CPU app.
Is it really worth it to use this app? Will it actually make an improvement in my battery life?
I don't want to use this app to speed up my phone, but to make it better on battery life.
I know you can set up profiles, but I'm not sure on what good setting would be to use. Can anyone give me some insight on this?
Also I'm running the latest version on MIUI and the Tiamat kernel.
P.S. Is there better kernels to be used then Tiamat?
Thanks in advance.

also I'm running the latest version on MIUI and the Tiamat kernel.
Click to expand...
Click to collapse
maybe it's just me, but am getting better bat life with the stock kernal. I ran the tiamat for a few days, switched back and it was obvious to me.

With Tiamat the default governor is smartass, which has a built in setting for when the screen is off, that only lets the phone see a max of 368640, which will save on battery life and does.
Now if you want to get into using your own profiles then an app such as Setcpu can be helpful.
I have been using this and this in place of Setcpu. It's a little faster reacting to the changes form screen off to on. Just another option.
I like the Tiamat Kernels as well as JD's Kernels. They both work well with Miui, at least on my phone anyway.

I've used Set CPU for awhile, but then got away from it. I'm back on it now since MIUI doesn't have a built in OC. I would try the two PacerguyDon suggested. I have used the andrev_oc it is fine. The second one appears to have more functions than Set CPU. Set CPU doesn't allow you to under volt if that is what you are looking for.
I saw that Set CPU is $0.99 on Amazon, if you want it. However, I would try the other two for free and donate to the one you like best.
I have been using JD's Kernel the last few days and it seems to provide better battery life than stock. I originally tried using the Smartass govenor, but had to go back to On Demand. The Smartass was causing screen wake delay when receiving a call.
I stole this from another PacerguyDon's post and it breaks down the different govenors found in most OC apps.
Govenors

Set CPU is free for XDA members. It also does allow undervolting according to their post.
http://forum.xda-developers.com/showthread.php?t=505419

What are your overclock settings?

What do you guys overclock your processor to on this phone? Back on my Galaxy S 4G I used SetCPU, so if that works on this phone too, what do you guys set it to, and why?
Cheers!

I think System Tuner is more popular now than SetCPU. I keep mine at 1.02Ghz to save battery life. If I really need major processing power I turn it up to 1.72Ghz using the Trinity Kernel.
With the new Trinity Kernel for the GS3 rooted running ICS UVALH2 I see Quadrant scores of 5800 and AnTuTu scores of 7800 - 8000.
Don't forget you need a custom kernel to overclock.

I set mine to 11.

psykhotic said:
I set mine to 11.
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Click to collapse
You set what to "11"? What does that even mean? Pretty vague statement.

stock

I used setcpu to change clock speed & system tuner to control voltage,running at 810mhz with interactive+Cfq on SGS3 Rom+Faux kernel,with these settings my phone last over 10hrs with about 20-30% battery to spare & that's with heavy data usage
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