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 Battery Kernel?

I'm about to flash the CM7 RC1 ROM and would like to know, what would be the best kernel to flash with it? I looked into the Savage Kernel and the links are dead. Does Netarchy do a universal kernel that works with all roms?

Mko979 said:
Hello everyone i"m just stopping by so I can reach my 10 post limit so that I can make a post in the development section.
Click to expand...
Click to collapse
You could have atleast answered his question, or made a useful post to reach it.
Anyways... the stock kernal that comes with cm7 is actually pretty good. But I use the savaged zen kernel, it gives me amazing battery life and has the smartass and savaged zen govenors tied in.

Bamba1260 said:
You could have atleast answered his question, or made a useful post to reach it.
Anyways... the stock kernal that comes with cm7 is actually pretty good. But I use the savaged zen kernel, it gives me amazing battery life and has the smartass and savaged zen govenors tied in.
Click to expand...
Click to collapse
Yea I downloaded it also. Next question. Where the hell is the google addons download link? Im going crazy here with no gmail app and market!!!

knowledge561 said:
Yea I downloaded it also. Next question. Where the hell is the google addons download link? Im going crazy here with no gmail app and market!!!
Click to expand...
Click to collapse
http://goo-inside.me/google-apps/latest/
I hear there is an issue with the market today and the gmail app isn't coming down right, but you can still give it a shot.

Use the stock kernel! CM team puts a lot of work into it.

strung said:
Use the stock kernel! CM team puts a lot of work into it.
Click to expand...
Click to collapse
Does the stock kernel work as good as this savage one i've been hearing about?

Stratus41298 said:
Does the stock kernel work as good as this savage one i've been hearing about?
Click to expand...
Click to collapse
I am running CM7 with the stock kernel and so far its great. Its fast and the battery life is nice for me. You can go into Settings > CyanogenmodSettings>Performance and change the cpu setting to batterysaver as well.

Man.. first off.. give one of the Nightlies a shot. RC1 was ok for me, but i found that nightly #6 was AMAZING...
Now on to your question... like mentioned above, the one that comes with CM7 is pretty awesome. However, i find that i like the Savage-zen a little more. I am using v1.0 with CFS and SBC and it is WOOOW!!!

caleby20 said:
I am running CM7 with the stock kernel and so far its great. Its fast and the battery life is nice for me. You can go into Settings > CyanogenmodSettings>Performance and change the cpu setting to batterysaver as well.
Click to expand...
Click to collapse
yeah and then your phone acts like it is dying everytime you try and do anything.
I much prefer the savaged.zen governor that is based off the smartass governor.
I usually get 2 - 2/12 days with the savaged.zen kernal with SetCPU set on this governor. Though i am about to try out not using SetCPU and using the built in settings from CM and see if they work the same and save me having SetCPU running 24/7. BTW i am running a 1750 MaH battery, same size as stock battery.

Yea I don't use that setting just letting the op know. Let me know how your testing goes. I'm going to try setcpu for the first time.
Sent from my Evo running CM7 RC1

bdoople said:
yeah and then your phone acts like it is dying everytime you try and do anything.
I much prefer the savaged.zen governor that is based off the smartass governor.
I usually get 2 - 2/12 days with the savaged.zen kernal with SetCPU set on this governor. Though i am about to try out not using SetCPU and using the built in settings from CM and see if they work the same and save me having SetCPU running 24/7. BTW i am running a 1750 MaH battery, same size as stock battery.
Click to expand...
Click to collapse
Which cm setting would be closest to smartass? Conservative? Ondemand?
Sent from my Evo running CM7 RC1

bdoople said:
yeah and then your phone acts like it is dying everytime you try and do anything.
I much prefer the savaged.zen governor that is based off the smartass governor.
I usually get 2 - 2/12 days with the savaged.zen kernal with SetCPU set on this governor. Though i am about to try out not using SetCPU and using the built in settings from CM and see if they work the same and save me having SetCPU running 24/7. BTW i am running a 1750 MaH battery, same size as stock battery.
Click to expand...
Click to collapse
Mind telling me what version of Savaged.Zen Kernel you are running to get this battery life? BFS or CFS?

Does anyone know if it is necessary to use profiles (ie. screen-off profile) if you're using the savagedzen governor?

anguyen2008 said:
Does anyone know if it is necessary to use profiles (ie. screen-off profile) if you're using the savagedzen governor?
Click to expand...
Click to collapse
You can. Alot of people say it helps alot but some say setcpu isn't helping. Try using the smartass governor and the screen off profile. That way it will underclock the CPU while screen is off. It won't hurt.
Sent from my Evo running CM7 RC1

[Q] LeeDroid & Setcpu

I have just updated to LeeDroid V2.2.2 and all is good.
Reading his post there is mention on using a I/O performance file and Setcpu.
What effect does setting the cpu to say 1.8ghz have on battery life?
I have downloaded Setcpu and had a look in the post but can't seem to find the best settings. Is there such a thing or not?

bluebirds said:
I have just updated to LeeDroid V2.2.2 and all is good.
Reading his post there is mention on using a I/O performance file and Setcpu.
What effect does setting the cpu to say 1.8ghz have on battery life?
I have downloaded Setcpu and had a look in the post but can't seem to find the best settings. Is there such a thing or not?
Click to expand...
Click to collapse
At 1.8ghz it will eat battery like a fat kid in a candy shop lol
Sent from my Desire HD using Tapatalk

just us it 245-1200(max) in smartass dude!the phone is already speed-up...only if u want benchmark results to impress yourself or some friends o/c it...

what will the i/o performance file do?
and how do you install it?

anheuer said:
what will the i/o performance file do?
and how do you install it?
Click to expand...
Click to collapse
I just installed leedroid yesterday, my first ever rom. I am also wondering if the IO patch will be of any use to me in every day use. I know lee says in his thread that its not fully tested so not sure whether to even experiment iwth it.
I think in Lees thead there are instructions for installing it.

CM7 and battery saving?

Im curious, if i need any apps like SetCPU or Cpu Tuner for CyanogenMod7.
I think somewhere i did read, that CM7 Kernel is doing all that (like undervolting/underclocking when screen is off), am i right or should i use SetCPU for better battery life?
Also if CM7 kernel is doing it, i guess its not safe to use such app as it would interfere with each other?
Thanks in advance...

I don't know the specifics but the newer CM7 builds have a built in overclocking tool more or less exactly like SetCPU. You can use that. CM7 is pretty good on battery life anyway as I can get 2 days out of it but it depends on my usage. I don't know about the kernel though but you could google it or ask thalmas.

k3lcior said:
Im curious, if i need any apps like SetCPU or Cpu Tuner for CyanogenMod7.
I think somewhere i did read, that CM7 Kernel is doing all that (like undervolting/underclocking when screen is off), am i right or should i use SetCPU for better battery life?
Also if CM7 kernel is doing it, i guess its not safe to use such app as it would interfere with each other?
Thanks in advance...
Click to expand...
Click to collapse
using set cpu is actually useless in cm7, if you want good battery click on the thread that's in my sig. ppl keep telling me that its good

deleate pls

Try juice defender.

You could try this http://forum.xda-developers.com/showthread.php?t=1081393 with a havs kernel.
I get up to 4 or 5 days with GingerVillain (It's based on CM7). I'm also using SetCPU, because the CM7 based CPU settings didn't work for me.

I think CM7 is good as is, but you can find OC option in Cyanogen Setting.

k3lcior said:
I think somewhere i did read, that CM7 Kernel is doing all that (like undervolting/underclocking when screen is off), am i right or should i use SetCPU for better battery life?
Also if CM7 kernel is doing it, i guess its not safe to use such app as it would interfere with each other?
Click to expand...
Click to collapse
All kernels can do that... app or CM7 settings are just some GUI to do it the easier way. But you can set it via terminal too

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?
Sent from my PC36100, running MIUI 1.5.13 - Tiamat-v4.0.3 using XDA Premium App.
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.