Develop Bugs

kworker battery drain in sleep mode

Yeah, that's another thread about battery drain overnight. With some screenshots.
ROM is AOKP b23, kernel s Trinity (tuna).
Sometimes it's about 20%, sometimes only 10. And rebooting phone (maybe with wiping battery stats) just before the night is helpful - then I get about 4-6% drain in 8 hours sleep time. And the phone isn't awake at that time (as you may see on graph), it's deep sleeping.
As BetterBatteryStats and SystemPanel tell me, it's system processes that use much of the battery at that time - few 'kworker' ones. I've searched the forums for some time, but still can't find a good explanation why they drain so much, nor why rebooting helps.
1) change kernel - yeah, I know, I can try that, but with stock kernel I've had the same problem - so I try to find the root of it, not just slap a few different kernels and see which one works better.
2) reboot every time before sleep - well... that's just isn't very convenient and weak way to deal with the problem.
See attached screenshots for further info.
So, any clues about what I can do to improve the situation?

Link
Link
Other than that, I couldn't find any relevant answers... perhaps a runaway system process... I'd recommend switching kernels, as this issue is known and yet unresolved. Seriously though, battery stats reports it using 56s, so is it really a major problem that is causing battery drain?

anton2009 said:
Link
Link
Other than that, I couldn't find any relevant answers... perhaps a runaway system process... I'd recommend switching kernels, as this issue is known and yet unresolved. Seriously though, battery stats reports it using 56s, so is it really a major problem that is causing battery drain?
Click to expand...
Click to collapse
I'd check that out, thanks! Yeah I know that it's a known problem, but still can't find any good solution for it...
Well it's the process that uses MOST of the system time during that period, so I guess it's enough to cause a drain. And also, there're multiple kworker processes - each may use a bit, but together they get enough for 10% overnight drain.
Which kernel would you recommend to try next? Franco? Seems pretty popular.
Edit: Seen both of these posts, no good solutions anyway. Will try another kernel, then!

I've had great results with Faux123 and I'm just now experimenting with LeanKernel, which is working well so far (wakelocks nonexistent).

I get the kworkers appearing in system panel too, but it doesnt actually effect my battery life. I lose 4% overnight but they show up in system panel.
Also their percentages never add up correctly. For example system panel shows maybe 1.3% cpu usage in total. But when i click thru to the system processes list, the sum of all kworkers exceed 1.3% by a good amount. So i always just ignore them.

Hmm... So maybe they aren't the root of the problem.
Anything else? Maybe battery need to be calibrated, like charging to 100, wiping stats, then discharging to 0 and again charge to 100?
What's really weird is that excessive drain occurs only with extended no-reboot period. Ie, If I reboot just before night drain will be 4-5%...

Check this out. Normally I get about 10% drain overnight, look at what happened last night..
Completely annihilated the battery, everything turned off.
Anyone have an explanation?
Sent from my Galaxy Nexus using Tapatalk
---------- Post added at 04:05 PM ---------- Previous post was at 04:03 PM ----------
The only thing I can think is that something I was doing when I used the phone before bed, kept some sort of process alive all night.

tixed said:
Yeah, that's another thread about battery drain overnight. With some screenshots.
ROM is AOKP b23, kernel s Trinity (tuna).
Sometimes it's about 20%, sometimes only 10. And rebooting phone (maybe with wiping battery stats) just before the night is helpful - then I get about 4-6% drain in 8 hours sleep time. And the phone isn't awake at that time (as you may see on graph), it's deep sleeping.
As BetterBatteryStats and SystemPanel tell me, it's system processes that use much of the battery at that time - few 'kworker' ones. I've searched the forums for some time, but still can't find a good explanation why they drain so much, nor why rebooting helps.
1) change kernel - yeah, I know, I can try that, but with stock kernel I've had the same problem - so I try to find the root of it, not just slap a few different kernels and see which one works better.
2) reboot every time before sleep - well... that's just isn't very convenient and weak way to deal with the problem.
See attached screenshots for further info.
So, any clues about what I can do to improve the situation?
Click to expand...
Click to collapse
Try using the kernel in my signature. this is a proof of what it gave me.

slimldj said:
Try using the kernel in my signature. this is a proof of what it gave me.
Click to expand...
Click to collapse
Great one! Less than 10% drain overnight, 30% per day with moderate-light usage

tixed said:
Great one! Less than 10% drain overnight, 30% per day with moderate-light usage
Click to expand...
Click to collapse
Awesome. Glad it worked.
Sent from my Galaxy Nexus using xda premium

tixed said:
Yeah, that's another thread about battery drain overnight. With some screenshots.
ROM is AOKP b23, kernel s Trinity (tuna).
Sometimes it's about 20%, sometimes only 10. And rebooting phone (maybe with wiping battery stats) just before the night is helpful - then I get about 4-6% drain in 8 hours sleep time. And the phone isn't awake at that time (as you may see on graph), it's deep sleeping.
As BetterBatteryStats and SystemPanel tell me, it's system processes that use much of the battery at that time - few 'kworker' ones. I've searched the forums for some time, but still can't find a good explanation why they drain so much, nor why rebooting helps.
1) change kernel - yeah, I know, I can try that, but with stock kernel I've had the same problem - so I try to find the root of it, not just slap a few different kernels and see which one works better.
2) reboot every time before sleep - well... that's just isn't very convenient and weak way to deal with the problem.
See attached screenshots for further info.
So, any clues about what I can do to improve the situation?
Click to expand...
Click to collapse
Sounds like you may be worrying about battery life too much. If this is worrying alot you may want to get an iphone. The 1750 mah battery is only rated at 10 hours. Lower your expectations about drainage per hour. The phone is constantly pinging cell phone towers to find the best signal possible even in deep sleep. That is the bulk of your drainage.

das7982 said:
Sounds like you may be worrying about battery life too much. If this is worrying alot you may want to get an iphone. The 1750 mah battery is only rated at 10 hours. Lower your expectations about drainage per hour. The phone is constantly pinging cell phone towers to find the best signal possible even in deep sleep. That is the bulk of your drainage.
Click to expand...
Click to collapse
No thanks, iOS is too restricted for me, and I like Google hardware better (I mean revised by Google, not manufactured ofc)
Yeah, I know, but that's 10 hours of USAGE. And I was getting much differentiated results in the same conditions (like <10% one night, >30% other) - that's what was worrying me.
I don't expect it to last whole week or anything, but 30% of power lost in one night when it's just on the shelf doing nothing (not even connected to wifi) - that's absurd. About 5-10% is ok, I guess. That's what I was getting with my Transformer, anyway - less than 1% per hour in sleep mode with wifi off.

Exact same problem. I'm on imoseyon's kernel. If I reboot I lose about5% over night. If not, about 30+. Some app is waking some system process up that is chugging away with the CPU. If I lay it on my bed our some other insulating surface, it is warm. Yes, my phone is entering sleep mode, no app doing wake locks, just kworker going nuts.

I am using samsung galaxy s2 and i am getting the kworker battery bug too. about 15% overnight which sucks.

derycklong said:
I am using samsung galaxy s2 and i am getting the kworker battery bug too. about 15% overnight which sucks.
Click to expand...
Click to collapse
Same happening here, but only after flashing the latest CM radio. I guess it might have something to do with that.

link i know it will help you,and let system go into sleep

hi guys, i visit the links posted but i'm still problems with that. Using watchdog app i notice that al least once a day it show me warning message about high use of cpu. In my case the process is kworker/u8: (here there's a number from 0 to 6)
My question is: what specific process causing that? There's a way to know it? I ask it because i don't think is battery releted, cause battery is very good, excluding for the monitor usage which is what consumes more...

I know that this is a really old topic but seeing that there's still at least one fresh enquiriy i thought i'd chime in...what in effect may indeed help you is wiping the cache (it did help me on several kworker/u occassions in the past). To do so you have to access the respective menu by booting your tablet while pressing the up volume rocker and the power button simultaneously. Hope this helps

[Q] Battery drain

Hi, I've got my S4 mini week ago and I was really satisfied with battery life, but suddenly yesterday my battery went crazy and right now, I get over 10% battery drain per hour, with just simple use. I didn't perform root or anything else with my phone. Please does anyone know where should be the problem? I don't wanna go to service with my phone in first week that I have it.
I've attached picture of my battery use.
Thank you for your answers..

Judging by the screenshot, the battery drain seems to be quite ok - you have made some phone calls, the screen was on for longer time as it seems.
Try to test the battery drain without using the phone.
To get more detailed information about battery usage, you can try Better Battery Stats (here on XDA http://forum.xda-developers.com/showthread.php?t=1179809 or in Play store) or Wakelock Detector (in Play store) apps.

Marek3_3 said:
Hi, I've got my S4 mini week ago and I was really satisfied with battery life, but suddenly yesterday my battery went crazy and right now, I get over 10% battery drain per hour, with just simple use. I didn't perform root or anything else with my phone. Please does anyone know where should be the problem? I don't wanna go to service with my phone in first week that I have it.
I've attached picture of my battery use.
Thank you for your answers..
Click to expand...
Click to collapse
I have the same problem. One time i killed about 20 apps and my stats looks like below
but when i restarted phone baterry problem come back. Now i don't know what i killed, but i try to find it.
PS
I have 9192 phone. (3G, wifi, gps are disable)

Get an app which offers some better statistics. I would recommend BetterBatteryStats, but since it costs two bucks you can try your luck with WakeLock Detector first (sorry, not allowed to post links). What you want to look into first is, if your phone is going into deepsleep mode when you are not using it. Wakelocks wake your phone from deepsleep and this costs battery life. Install one of the above apps (if it is BBS activate the WatchDog from Settings), reboot your phone and put it away for an hour or do this over night. Then check if there apps which keep your phone awake. Good luck.
P.S.: It seems there is a bug in Android 4+ which causes battery drain on some devices, including Samsung devices. It occurs suddenly and can be stopped by a reboot. Google: android issue 22878
The ticket is from 2011 but was recently marked as obsolete, whatever that means.
cheers

[Q] CyanogenMod 11 is killing my battery. Help!

I've looked all around for any thread similar to this - couldn't find it.
Long story short. I rooted my phone and installed CM11 (Sept 14). My battery used to last around 30 hours. Now I'm lucky to get 8 or 9. Without any use, I lose around 40% during the night (7 or 8 hours). I used to lose 7 or 8%.
Is anyone having the same issue?

Go to the battery tab in settings and find out what is using the most energy. You can also use greenify to monitor usage.

Or try diff kernel..

what are your governor settings, and clock settings?
You can use Better Battery Stats to track down what is causing the drain.

idtheftvictim said:
what are your governor settings, and clock settings?
You can use Better Battery Stats to track down what is causing the drain.
Click to expand...
Click to collapse
Clock is stock, governor settings are at "interactive". I got Better Batery Stats. "Android OS" is draining my system. There were a couple of modules mentioned. I was expecting a rogue app was eating up all processor cycles.
I downloaded the Deep Sleep widget. My phone had a 35% deep sleep time.
I'm pretty sure it's doing something all the time that is draining the battery...
So I installed DS Battery Saver Pro. All I can say is WOW. Battery drain went from 7% (on stock Galaxy Note 3) to 40% on CM11 to...
0% overnight / 97% Deep Sleep
That's right. 0%!!! I can't believe it! Battery life is so much better and performance is basically the same.
I guess something was keeping the phone awake with CM11, and DS Battery Saver Pro fixed it!

fjhuerta said:
I've looked all around for any thread similar to this - couldn't find it.
Long story short. I rooted my phone and installed CM11 (Sept 14). My battery used to last around 30 hours. Now I'm lucky to get 8 or 9. Without any use, I lose around 40% during the night (7 or 8 hours). I used to lose 7 or 8%.
Is anyone having the same issue?
Click to expand...
Click to collapse
Okay, it seems like the app Greenify helps a bit but doesn't completely solve the problem. Try that and let me know what you think.

teendroid said:
Okay, it seems like the app Greenify helps a bit but doesn't completely solve the problem. Try that and let me know what you think.
Click to expand...
Click to collapse
Not that this will help you, but I had the same issue. Normal usage would drain before the day was over...went to Tweaked 3.55 and problem went away, which sucks because I LOVE CM11 minus the camera...for some reason I think the camera is always better with stock based roms.

DS Battery Saver Pro only did so much. With normal usage my phone simply won't last a whole day. CM11 is killing it. I have nothing else installed...

Found it!
So, I found what was eating up the battery. The battery stats didn't help. DS only saved some of the battery at night. The phone was simply consuming obscene amounts of energy while on and every indicator seemed normal.
It was ART!
I went back to stock Touchwiz and hated my phone so much I was this close to selling it and getting a OnePlus. But I reinstalled CM11 and decided to add apps one by one to find out what was going on. Everything was fine and yesterday I finally enabled ART in the end. The phone wasn't any faster, but it went from spending 3-4% battery at night to 45%. And during the day, it dropped 1% every 2 of 3 minutes with light use.
So, there it is. Blame ART and never enable it on CM11 if you have battery issues.

fjhuerta said:
So, I found what was eating up the battery. The battery stats didn't help. DS only saved some of the battery at night. The phone was simply consuming obscene amounts of energy while on and every indicator seemed normal.
It was ART!
I went back to stock Touchwiz and hated my phone so much I was this close to selling it and getting a OnePlus. But I reinstalled CM11 and decided to add apps one by one to find out what was going on. Everything was fine and yesterday I finally enabled ART in the end. The phone wasn't any faster, but it went from spending 3-4% battery at night to 45%. And during the day, it dropped 1% every 2 of 3 minutes with light use.
So, there it is. Blame ART and never enable it on CM11 if you have battery issues.
Click to expand...
Click to collapse
Please,let me know, what is ART.
Thanks.

Johnmeeus said:
Please,let me know, what is ART.
Thanks.
Click to expand...
Click to collapse
http://lmgtfy.com/?q=art+android

Huge battery drain even in airplane mode (yes another battery thread!)

Apologies if this seems well travelled path, and I've certainly led a lot over the internet. But I just wanted to describe my issue and see if I've missed anything!
I've had chronic battery issues, and had a spare and I'd swap them in/out but I came to conclusion that wasn't great as it may not read battery stats well doing two different batteries. I was getting less than 12 hours between batteries. So now i have Powerbear 6500mAh battery and have been using it for a week. Apart from a heavy usage day I can now get 24 hours out of it. Superb.
Then as if by magic, trouble returns! The battery drained 11% overnight in seven hours. That's in airplane mode. 11% of a 6500mAh battery! Battery stats shows nothing has used battery in particular, just phone idle. Wake locks there was nothing significant. Now 5 hours later it's dropped another 43% with not a lot of use, just web and some maps.
Things I've tried:
Making sure the option to store activity logs is off.
Location turned off for all but most vital apps, like maps.
No automatic syncing of anything.
Greenify - and I shut down anything I can.
Wakelocks - ensuring nothing is abnormal, got rid of CityMaps due to excessive wakelocks.
Airplane mode at night - no cell, no wifi.
I rooted and reset the OS about six months ago, so that is my logical next step... but I'd rather understand what could cause 11% of 6500mAh to be drained by doing nothing!
Any thoughts of what I might have missed?
Stats: LG G4. LG-H815. Android 6.0. Build MRA58K. Software V20g-EUR-XX.
Thanks
Antony

What root method did you choose? SuperSU or Magisk? With Magisk my phone was hot (~70C) and got only 1.5h screen time, when i switched to SuperSU, it was gone.

Install GSam Battery Monitor app from the Play Store and see if it helps show you what's using up the battery.

I know you are not going to like reading this but
I don't use these extended batteries for a reason. Phone wasn't made for it.
Try your original battery
These extended batteries are also known to crap out after 500 charges
Use battery monitoring app to help you determine what's happening

MattheewHun said:
What root method did you choose? SuperSU or Magisk? With Magisk my phone was hot (~70C) and got only 1.5h screen time, when i switched to SuperSU, it was gone.
Click to expand...
Click to collapse
SuperSU
divineBliss said:
Install GSam Battery Monitor app from the Play Store and see if it helps show you what's using up the battery.
Click to expand...
Click to collapse
I removed it as it never provided me anything worthwhile. I think it used to just say Android used the power or something vague. I can reinstall it, but there was never one specific identifiable reason I remember that.
deltadiesel said:
I know you are not going to like reading this but
I don't use these extended batteries for a reason. Phone wasn't made for it.
Try your original battery
Click to expand...
Click to collapse
Then I have to put up with a phone that won't last 6 hours, which is what led me to get additional batteries and now the PowerBear.
That said the following night, it used about 2% overnight... so erratic to say the least! And I have 59% left after 10 hours use. It's just the randomness the other day that spooked me. I did learn it was low on disk space, could have that caused that particularly bad event?

Did you try switching kernel? I can suggest you to try Imperium Kernel, that will reduce the system's usage. Other than this i have no idea. :\
---------- Post added at 06:47 PM ---------- Previous post was at 06:44 PM ----------
deltadiesel said:
I know you are not going to like reading this but
I don't use these extended batteries for a reason. Phone wasn't made for it.
Try your original battery
These extended batteries are also known to crap out after 500 charges
Use battery monitoring app to help you determine what's happening
Click to expand...
Click to collapse
What you said, is nosense for me. Some custom batteries are better than the original. You jsut must be lucky to pick the right one.

MattheewHun said:
Did you try switching kernel? I can suggest you to try Imperium Kernel, that will reduce the system's usage. Other than this i have no idea. :\
Click to expand...
Click to collapse
Thanks. I was thinking of doing something like that. Thanks for the heads up, there's a lot of choices... I'll check that one out.

How do I know if the bn31 battery is still good?

Hi ... I have a question about bn31 battery ... how do I know if the battery life is still good?
Using the multimeter, it marks 4.20v ... it means that this good or I need to change? the cell phone is not lasting for 6hrs of use and the battery is gone. Would you like to know if it's really the battery or have something else with the phone?

Use AIDA64 app to check battery health

Hi. Thanks for informativo. But i want anything more physical...no app...i don't believe much in the app's :good:

lucasbellinaso said:
Hi ... I have a question about bn31 battery ... how do I know if the battery life is still good?
Using the multimeter, it marks 4.20v ... it means that this good or I need to change? the cell phone is not lasting for 6hrs of use and the battery is gone. Would you like to know if it's really the battery or have something else with the phone?
Click to expand...
Click to collapse
Used AccuBattery and then use your phone as normal and let it charge for 4-5 times, then you will get the estimate battery health left from your phone. Screenshot is from my Mi A2.

You know it's good if it doesn't look like this:

Late reply.
I'm using AccuBattery App since March 2019 and its working very well for My MiA1. I trust it after cross-checking with alternate indicators.
Most important is the time spent in Deep Sleep. If you get zero or small percentage of time in this mode even after overnight inactivity, your mobile has background apps that are consuming battery.
I have been using Greenify App for many years and it helps cleaning up. I think it's a necessary App.
Try the following:
Shut down the phone. Reboot from Cold.
Put the Battery Saver ON w/o doing any other app launch.
Do the same thing first, after every Charging.
Every morning, I check the Deep Sleep. I do get additional ~6hrs (same as your sleep time). The average discharge rate falls to 1 to 1.5%/h.
AccuBattery does help, working consistently for last 8 months.