Root Horrible Battery Life - Bad Rom + Kernal Combo?

You are not alone. I flashed Fresh 3.2 last night. I did not flash a kernal so it is whatever comes with the ROM. I unplugged with full charge 2.5 hours ago and I am down to 76% now according to battery indicator. I had heard that battery life was great with Fresh, but not experiencing it. Otherwise the ROM seems good.

I have been using fresh 3.2 rom and get about 25 hrs on average per charge

I am using Revision 4.1.9.1-CFS BETA - Fresh Compatible

1. I flashed fresh 3.2 when it first came out for donors. Kept stock kernel for a while
2. flashed netarchy Revision 4.1.8-bfs edition - Fresh3 Compatible about a week later
3. Used set cpu to underclock with profiles and used the select device to get the right settings

**WIPE CACHE AND DALVIK-CACHE BEFORE FLASHING KERNEL

Decided to try Revision 4.1.9.1-CFS BETA - Fresh Compatible, disabled my profiles, rebooted into recovery, wiped batery stats, flashed kernel rebooted, calibrated battery with the variation steps, and ran with it.

I do have the stock battery and get great battery life. I use juice defender as well, but dont think it really does anything.

After i flashed new kernel, i set my cpu to 989 and min to 240 set on boot.

My phone does not seem slow and works great no lags and am getting about t1 speeds on 3g with pri 1.77


Let me know if you need any more info.

I have now moved to fresh 3.3 and testing battery life

Check out my thread on this

http://androidforums.com/evo-4g-all...hy-kernel-fresh-3-2-insane-battery-drain.html

I am currently investigating the way to get it working right.

Basically my main issue was wiping cache/dalvik cache. My latest attempt with setcpu + stock kernel gave me about 20% battery drain in 10 hours idle. 2% drain per hour does not sound wonderful, but it is not horrible. Its not 20% drain in idle per hour. I thought it was my battery / a virus / I ****ed up my hardware / etc. Very stressful. Everything helpful anyone said actually gave me an inverse, instead of helping it made it worse.

The ONLY way I could fix the problem to "reset" it, is to flash a PC36IMG.zip which I used to root my phone (the 2.2 one from the root guide with Amun Ra) and it resets EVERYTHING to stock + rooted (yes I applied the 2.2 root patch too). Once that is done, everything is working fine. Dalvak cache gets wiped, everything goes to hell until another PC36IMG.zip fix.

Feel free to help me investigate the issue on my thread. The more info we can round up the better. I'd like to get some good results and possibly create a sticky thread for those who suffer from this horrible horrible ailment

betac said:

25hrs!!! WTF. I am lucky if I get 7. I dont get this... could it be hardware related?

I have setcpu and have all the same profiles. I posted a picture of my system panel week long view. Its ridiculous. I have 2 batteries both are just as bad.

Click to expand...

First thing i would do is fully charge your battery and when you go to bed unplug it, turn on airplane mode and see how the battery acts. Also what us your up time v awake time. what are you account sync settings, does facebook do background updates? are you auto logged into gchat? have you calibrated your battery?

also if you use 4.1.9 w/ havs you need to disable all profiles

bookmarked!

betac said:

GrandMaster I will check out your post thanks!

wake69
I will test the airplane mode tonight and let you know the up time v awake time.

I dont use facebook, tweeter.

Google, weather and news every 4 hours.

No gchat logged in background.

Have calibrated both batteries

I thought you only needed to disable set cpu profiles when flashing 4.1.9, I thought i read that you could turn them back on after. Anyway I turned them off for testing.

Click to expand...

On HAVS kernels, it is only needed to set an overclock and change the governor. Do not set any profiles.

Just flashed the netarchy kernal linked above. I wiped the battery stats first and will calibrate the battery as noted and see what happens.

betac said:

GrandMaster I will check out your post thanks!

wake69
I will test the airplane mode tonight and let you know the up time v awake time.

I dont use facebook, tweeter.

Google, weather and news every 4 hours.

No gchat logged in background.

Have calibrated both batteries

I thought you only needed to disable set cpu profiles when flashing 4.1.9, I thought i read that you could turn them back on after. Anyway I turned them off for testing.

Click to expand...

Also, a little info on HAVS and AVS: The purpose of HAVS is to minimize the power used by the CPU by determining and setting the optimal voltage. At the same time, the maximum voltage by which HAVS can scale to is fixed to a specified voltage depending on the CPU frequency in order to prevent scaling to a higher voltage than what is normally used at a specified voltage. The optimal voltage is actively determined for each frequency and temperature. HAVS actively adjusts the CPU voltage as the CPU frequency and temperature changes.

betac said:

Ok so I didnt do the tests last night as my speaker started doing loud crackling above halfway volume. So i had to unroot my phone last night, took 3.5 hours. I thought I bricked it at one point.... thank god for nandroid backups.

Anyways, I am now back on s-on with stock 2.2. I have noticed my battery life if f*ing phenomenal (comparatively). I was thinking of how to test with my new phone i am exchanging out today.

Click to expand...

Check out my thread...

http://androidforums.com/evo-4g-all...hy-kernel-fresh-3-2-insane-battery-drain.html

I've been doing some testing of many kernels. So far for me the new OTA is pretty optimal. Today I got 12h battery life 2 of which were medium usage, 3 heavy usage, rest idle (BTW listening to music with screen off and underclocked to 255mhz is same thing as having it on idle).

Good luck. Hope you don't spend a week of evo hell like I did. I am still retraining my battery by wiping battery stats, so will post on my thread again if the battery life is in any way extended.