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] S3 Battery drain during use

I know there are hundreds of these threads but i was unable to find the information that I'm looking for. But my guess is there is no real answer to my question. But i've been wrong before. Please bear with me
Here goes.
I want to know how to maximize the battery when USING the phone. I dont care about wakelocks or sleep time etc.
I am interested in getting to max out the usage time.
For example when I stream radio and surf the net and text. My phone lasts 2 hours with max birghtness. That seems really short.
- I've done all that I know to minimize power consumption with turning off sync, settings, etc.
- I have tasker starting and stopping data during screen on/off.
- I have the phone UV and under clocked.
- I Limit my phone to 3G only, with no LTE
- Also signal is not a problem since I can stream and surf without an issue. With areas with poor reception. I don’t even use the phone really
-*I also have all the chats turned on include facebook, whats app, etc. Once again, phone is awake. and I'm concerned with its ON screen usage battery time.
- I even have the second CPU setting on conservative. (when set on ondemand it drains even faster)
But during usage, its terribly short! What can I do to prolong the life?
The battery was always like this and I dont believe its defective. With regular use, checking phone (once or twice every hour) can easily last a day. But during multitasking usage I notice the drain to be 49-59% per hour according to battery spy.
I know I can uninstall battery spy/BBS to conserve battery. But I'm looking for what some are reporting (4-5 hours of on screen usage time).
Looking for some guru-like advice Thansk in advanced

Personally, I get the best battery life out of the stock kernel of whatever particular ROM I'm running. I stick with tw based ROMs, and I greenify almost everything! I consistently get between 5 and 6 hours of "screen on" time with the stock battery.

You never said what ROM and kernel combo you're using. I know that I get 3 to 4 hours of screen time depending on the apps used and the connections utilized (wifi, signal strength, LTE or H+, etc). 2 hours definitely sounds low though. I'm using stock debloated ROM right now and stock kernel. I have not modified voltage or clocking in any way (yet).
Sent from my SAMSUNG-SGH-I747

DMF1977 said:
Personally, I get the best battery life out of the stock kernel of whatever particular ROM I'm running. I stick with tw based ROMs, and I greenify almost everything! I consistently get between 5 and 6 hours of "screen on" time with the stock battery.
Click to expand...
Click to collapse
I didnt really notice any improvements on the KT747 vs stock kernel.
I greenify everything except for the messaging apps. But then again, when my screen is on, i want ot be using those apps.
aybarrap1 said:
You never said what ROM and kernel combo you're using. I know that I get 3 to 4 hours of screen time depending on the apps used and the connections utilized (wifi, signal strength, LTE or H+, etc). 2 hours definitely sounds low though. I'm using stock debloated ROM right now and stock kernel. I have not modified voltage or clocking in any way (yet).
Sent from my SAMSUNG-SGH-I747
Click to expand...
Click to collapse
Its in my sig
Stock 4.1.1 JB
KT747
3G good signal.
Using tune in radio while texting on go sms and surfing using chrome with 7 tabs open

Bump

You're doing heavy multitasking!! It's going to eat the battery, sorry, but no one's going to post a magic "cure" to increase battery life! Buy an extended battery... Problem solved.

DMF1977 said:
You're doing heavy multitasking!! It's going to eat the battery, sorry, but no one's going to post a magic "cure" to increase battery life! Buy an extended battery... Problem solved.
Click to expand...
Click to collapse
Websurf and radio or text and radio is just 2 tasks occuring.
Well I can say that running on Wifi, I can get regular battery life about 4-5 hours of use and over 20 hours of idle time.
The radio seems to be the main culprit, so the question is..... what can be done about that?
I'm asking because
- I flashed diff modems and seems to yield same results
- other S3 from my friends seems to last longer with multitasking
- signal....strong or weak seems to produce same drain.

Battery?
mikoal said:
Websurf and radio or text and radio is just 2 tasks occuring.
Well I can say that running on Wifi, I can get regular battery life about 4-5 hours of use and over 20 hours of idle time.
The radio seems to be the main culprit, so the question is..... what can be done about that?
I'm asking because
- I flashed diff modems and seems to yield same results
- other S3 from my friends seems to last longer with multitasking
- signal....strong or weak seems to produce same drain.
Click to expand...
Click to collapse
I've had the same problem. I couldn't get the same battery life as others I know. I always turn my GPS off if I didn't need to use it. Google now seemed to kill my battery so I stopped using it. But, the one thing I did notice is that the battery stats can be a little deceiving. If I left my phone off the charger and didn't use it for 10 hours and then started to play a game, it would look like I was getting good battery life as I would have about 60% battery left. Now if I played the game right after unplugging my phone, and then after the same 10 hours I'd be around 40%. Hopefully that makes sense.
One thing that I did do to overcome this was get an extended battery. It does add a little bulk, but now I can use my phone like I want and not have to worry about my phone dying on me at night. I can even forget to plug it in and still have battery the next day. For me I got the hyperion 4200 battery. The Zero Lemon seemed just to big for my tastes.
The other thing is also the ROM. At times I have found the same ROM but a different version exhibited different results. All ROM's offer something different so it is a give and take situation.
I hope this helped.

splxtreme said:
I've had the same problem. I couldn't get the same battery life as others I know. I always turn my GPS off if I didn't need to use it. Google now seemed to kill my battery so I stopped using it. But, the one thing I did notice is that the battery stats can be a little deceiving. If I left my phone off the charger and didn't use it for 10 hours and then started to play a game, it would look like I was getting good battery life as I would have about 60% battery left. Now if I played the game right after unplugging my phone, and then after the same 10 hours I'd be around 40%. Hopefully that makes sense.
One thing that I did do to overcome this was get an extended battery. It does add a little bulk, but now I can use my phone like I want and not have to worry about my phone dying on me at night. I can even forget to plug it in and still have battery the next day. For me I got the hyperion 4200 battery. The Zero Lemon seemed just to big for my tastes.
The other thing is also the ROM. At times I have found the same ROM but a different version exhibited different results. All ROM's offer something different so it is a give and take situation.
I hope this helped.
Click to expand...
Click to collapse
Yea my gps only turns on when my map turns on via tasker. I also dont have google now on.
Ya i understand what you mean on the percentages.
Ive seen people wiht great battery life, i wanted to try to acheive that without an extended bat. I was wondering if there was somehting that was obvious, or some radio battery drain fix. (I even tried only 3G, and still drains)
Thanks

mikoal said:
Yea my gps only turns on when my map turns on via tasker. I also dont have google now on.
Ya i understand what you mean on the percentages.
Ive seen people wiht great battery life, i wanted to try to acheive that without an extended bat. I was wondering if there was somehting that was obvious, or some radio battery drain fix. (I even tried only 3G, and still drains)
Thanks
Click to expand...
Click to collapse
It's a little hard to compare, but right now I'm on a 4.3 ROM and the battery life has been exceptional. Otherwise the next one that has been closest for me in terms of battery life has been Dandroid. Also, it's hard to judge a ROM after a day.
I guess I should have asked if you have tried or have any interest in a custom ROM.

splxtreme said:
It's a little hard to compare, but right now I'm on a 4.3 ROM and the battery life has been exceptional. Otherwise the next one that has been closest for me in terms of battery life has been Dandroid. Also, it's hard to judge a ROM after a day.
I guess I should have asked if you have tried or have any interest in a custom ROM.
Click to expand...
Click to collapse
I tried customs like AOKP, PA, CM etc before. I dindt notice a gain in bat life.
I do enjoy's stocks stability so I would like to find a solution with my stock phone. But doesnt see like theres one....

mikoal said:
I tried customs like AOKP, PA, CM etc before. I dindt notice a gain in bat life.
I do enjoy's stocks stability so I would like to find a solution with my stock phone. But doesnt see like theres one....
Click to expand...
Click to collapse
I've had a hard time getting really good battery life from the stock ROM. At best using greenify, I could prolong it a bit. If you are interested in a stock ROM with some tweaks, I always suggest S3Rx, or Dandroid if you want a slimmed down version without the bloat.
You can always try the power save mode as that does seem to help some, but you may experience some lag.

splxtreme said:
I've had a hard time getting really good battery life from the stock ROM. At best using greenify, I could prolong it a bit. If you are interested in a stock ROM with some tweaks, I always suggest S3Rx, or Dandroid if you want a slimmed down version without the bloat.
You can always try the power save mode as that does seem to help some, but you may experience some lag.
Click to expand...
Click to collapse
Ive frozen most of the bloat, greenified everything, plus I unclocked and under volted it, so any lag I would feel from power safe wont affect me since i believe power save throttles to 1350 ish .

pm8921_bms_low wakelock after battery low warning

Hi! I'm using a gt-I9195 with stock 4.2.2 and arco's kernel. I've got this problem: after I get the battery popup warning, this wakelock pops up and keeps clock frequency at 810 mhz the whole time while idle. The battery drops so fast that after a few minutes the phone already shuts down itself. Sometimes I get the first popup warning (at 15%) and no wakelock, but usually after the second popup (5%) the wakelock appears.
I'd like to use even the last 5-15% of charge. This way, I absolutely have to charge the phone before 15% to be sure that battery won't start to drop like crazy.
I found nothing about this wakelock. What the hell is that??

After some days, I can say that it doesn't pop up always at the same time. Sometimes at 15%, sometimes at 7%, sometimes at 3% etc. And sometimes not at all.
However, EVERY TIME it appears, battery starts to drain like CRAZY. It is not a "regular" wakelock. In 2-5 minutes, battery is died. I keep reaching this low battery levels just for testing purposes... I really don't understand this wakelock.

marchrius said:
After some days, I can say that it doesn't pop up always at the same time. Sometimes at 15%, sometimes at 7%, sometimes at 3% etc. And sometimes not at all.
However, EVERY TIME it appears, battery starts to drain like CRAZY. It is not a "regular" wakelock. In 2-5 minutes, battery is died. I keep reaching this low battery levels just for testing purposes... I really don't understand this wakelock.
Click to expand...
Click to collapse
Not that this will help you any, but seeing as no-one else has responded, just thought I'd let you know you're not alone, and also it's not a problem specific to Arco's kernel - I seem to get the same thing on a completely unmodified S4 Mini.
It suffers from the 'battery drain while idle' bug anyway, for which I'm planning to install Arco's kernel soon, but somewhere between 15% and 5% remaining each time the drain really goes nuts. I can't see the CPU speed, but I've an app installed to monitor and log battery drain in % per hour, and it's usually around 3-4%. After the low battery warning, it jumps to 70-80% an hour, and like yours my phone can go from low battery warning to dead within a few minutes, just sitting idle.

Victoria75001 said:
Not that this will help you any, but seeing as no-one else has responded, just thought I'd let you know you're not alone, and also it's not a problem specific to Arco's kernel - I seem to get the same thing on a completely unmodified S4 Mini.
It suffers from the 'battery drain while idle' bug anyway, for which I'm planning to install Arco's kernel soon, but somewhere between 15% and 5% remaining each time the drain really goes nuts. I can't see the CPU speed, but I've an app installed to monitor and log battery drain in % per hour, and it's usually around 3-4%. After the low battery warning, it jumps to 70-80% an hour, and like yours my phone can go from low battery warning to dead within a few minutes, just sitting idle.
Click to expand...
Click to collapse
Glad I'm not alone. I assume you're on Jelly bean as well since you're talking about Arco's kernel whch is for JB firmwares as far as I know.
Maybe on KK this weird drain has been patched, some reports from KK stock firmware users would be interesting.

marchrius said:
Glad I'm not alone. I assume you're on Jelly bean as well since you're talking about Arco's kernel whch is for JB firmwares as far as I know.
Maybe on KK this weird drain has been patched, some reports from KK stock firmware users would be interesting.
Click to expand...
Click to collapse
Yes, on JB - I thought it might be a battery calibration issue until I saw your post about the CPU (and until trying to calibrate the battery didn't do any good).
Would be nice if KK fixed it, although it'd probably be by chance - since I can't find any mention of the bug online except in your original post, it doesn't look like it's affecting many people, so doubt if Samsung are even aware of it. Still, fingers crossed!

Yeah, searching pm8921_bms_low gives very little results. For what I understand, usually this is a wakelock of 1 second or less that pops up when there's the battery low warning.

marchrius said:
Yeah, searching pm8921_bms_low gives very little results. For what I understand, usually this is a wakelock of 1 second or less that pops up when there's the battery low warning.
Click to expand...
Click to collapse
Hi again! Just wondering if you have any battery saving apps installed? I had one called Battery Doctor installed, and removed it after installing Arco's kernel as I no longer needed it - since then I've let the battery run down to 2-3% on several occasions without seeing any sudden drain. Previously it always seemed to happen me at 5%, and often before that. It might be worth removing any battery related apps just as a test.

Victoria75001 said:
Hi again! Just wondering if you have any battery saving apps installed? I had one called Battery Doctor installed, and removed it after installing Arco's kernel as I no longer needed it - since then I've let the battery run down to 2-3% on several occasions without seeing any sudden drain. Previously it always seemed to happen me at 5%, and often before that. It might be worth removing any battery related apps just as a test.
Click to expand...
Click to collapse
It might be just luck... otherwise I don't know what to think It happened to me as well to reach 2 or 3% with no battery drain at all, but never regularly.
I don't have battery saving apps (last one I've used was green power two years ago), only greenify but shouldn't make a difference. I read from another forum that plenty of people have this issue, a guy sent his phone to samsung for this specific problem and wrote that he will inform us if they'll solve the problem (honestly, I hope it can be solved by swapping the battery or updating the firmware ).

marchrius said:
It might be just luck... otherwise I don't know what to think It happened to me as well to reach 2 or 3% with no battery drain at all, but never regularly.
I don't have battery saving apps (last one I've used was green power two years ago), only greenify but shouldn't make a difference. I read from another forum that plenty of people have this issue, a guy sent his phone to samsung for this specific problem and wrote that he will inform us if they'll solve the problem (honestly, I hope it can be solved by swapping the battery or updating the firmware ).
Click to expand...
Click to collapse
That is strange - I was getting it literally every time at 5% if not before, and I still haven't had the issue once since I last posted, I've kept letting the battery get down to 2-3% each time just to test. Oh well, I'll enjoy it while it lasts! Will let you know if the problem reappears, and will be interesting to hear if this other guy gets a solution from Samsung.

I tried to let discharge it again and the drain appeared somewhere between 7 and 6%. I definitely have the issue but I've learned simply to plug it at 20% or more, it is better for the battery too.

[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

S4 Mini overheat and battery drain after KitKat Update

Hi all.
I am a new user of this community.
I am looking for a fix to my troubles.
Two weeks ago I updated my s4 mini to KitKat via OTA.
My Galaxy was TOTALLY officially, no custom rom, no recovery, no root... so i updated in the "classic" way.
From that day my smartphone drains battery really, really, fast and becomes really hot.
I am talking about 50° celsius when i only browse internet or use whatsapp to send message, and in the same time the battery drains fastly.
I rooted the phone, look to wakelock, look to process that could drain it, i made two factory reset, flash via Odin to the Italy Stock 4.4.2 (before it has got the English firmware version), buy a new battery, use different charger, calibrate it by app, calibrate it with the non-root method... but the problem persist.
I have got GPS off, Wifi OFF, NFC Off, S-Beam Off, Bluethoot Off... i only use internet via GSM or UMTS, no LTE.
To browse I use Opera Mini, but it's the same thing with Chrome.
I don't know what to do, i don't think it's an app problem, and it's impossibile that is by hardware, because with Jeally Bean the smartphone goes great.
I am actually trying Coolify after try Battery Doctor and a lot of other apps, like Gsam Battery, Greenify, Battery Calibrate ecc...
I've attacched some screenshot here. How can you see by the battery graph the battery drains like there's not a tomorrow in same time :crying:
ps: sorry for my english, how can you see by the screenshot i am italian.

Mee too I have this problem

gian90t said:
Hi all.
I am a new user of this community.
I am looking for a fix to my troubles.
Two weeks ago I updated my s4 mini to KitKat via OTA.
My Galaxy was TOTALLY officially, no custom rom, no recovery, no root... so i updated in the "classic" way.
From that day my smartphone drains battery really, really, fast and becomes really hot.
I am talking about 50° celsius when i only browse internet or use whatsapp to send message, and in the same time the battery drains fastly.
I rooted the phone, look to wakelock, look to process that could drain it, i made two factory reset, flash via Odin to the Italy Stock 4.4.2 (before it has got the English firmware version), buy a new battery, use different charger, calibrate it by app, calibrate it with the non-root method... but the problem persist.
I have got GPS off, Wifi OFF, NFC Off, S-Beam Off, Bluethoot Off... i only use internet via GSM or UMTS, no LTE.
To browse I use Opera Mini, but it's the same thing with Chrome.
I don't know what to do, i don't think it's an app problem, and it's impossibile that is by hardware, because with Jeally Bean the smartphone goes great.
I am actually trying Coolify after try Battery Doctor and a lot of other apps, like Gsam Battery, Greenify, Battery Calibrate ecc...
I've attacched some screenshot here. How can you see by the battery graph the battery drains like there's not a tomorrow in same time :crying:
ps: sorry for my english, how can you see by the screenshot i am italian.
Click to expand...
Click to collapse
You have to root and install recocery on your device. There's a thread arnd here created by Arco for you to find the recovery files. He also provided a kernel for KitKat regarding the wakelocks if im not mistaken. So flash that kernel and like i said, recovery and root is needed.
Sent from mah AssForMini

You may have a faulty firmware installed. Try updating to the latest one with Odin from sammobile.com.

i flash a stock rom android 4.4.2 3 time and the same probleme...so wat kenel i should use me and my friend

znayver said:
i flash a stock rom android 4.4.2 3 time and the same probleme...so wat kenel i should use me and my friend
Click to expand...
Click to collapse
Like I said, go to Arco's recovery thread. He provided a 4.4 kernel to fix Stock ROM problem
EDIT: Rite i guess this is sad for all of ya but Arco made the kernel for 4.2.2 stock only. No 4.4. Here's the link: http://forum.xda-developers.com/showthread.php?p=43622999
Sent from mah AssForMini

TiTAN-O-One said:
Like I said, go to Arco's recovery thread. He provided a 4.4 kernel to fix Stock ROM problem
EDIT: Rite i guess this is sad for all of ya but Arco made the kernel for 4.2.2 stock only. No 4.4. Here's the link: http://forum.xda-developers.com/showthread.php?p=43622999
Sent from mah AssForMini
Click to expand...
Click to collapse
tnx for your information...which that be soon suported 4.4

Android says me that i've got the 56% of battery at this moment, with about 5 hours to use (only 34 minutes of screen on and GSM only mode)
In the same time 3C Toolbox says that i've spent the 34%. That's mean i've got the 64% of battery.
It could be an Android indicator error?
I tried to calibrate battery using Battery Calibrate, now i will do it with 3C toolbox, maybe it's better.
So, using Coolify i see a little improvement in temperature (never up 45°) and the drains seems go slowly then before.

gian90t said:
Android says me that i've got the 56% of battery at this moment, with about 5 hours to use (only 34 minutes of screen on and GSM only mode)
In the same time 3C Toolbox says that i've spent the 34%. That's mean i've got the 64% of battery.
It could be an Android indicator error?
I tried to calibrate battery using Battery Calibrate, now i will do it with 3C toolbox, maybe it's better.
So, using Coolify i see a little improvement in temperature (never up 45°) and the drains seems go slowly then before.
Click to expand...
Click to collapse
If its the indicator, then what causes the CPU heating? Battery indicators in all devices are not accurate even after making it "accurate". Like eg, my Galaxy Wonder had 18% battery. After reboot while charging i got 90% and lasted a few hours. But honestly, no heating issues back then.
I still am confident that its a kernel problem. Being a flash-a-holic, i didn't try the 4.4 update then cos of KNOX
Sent from mah AssForMini

TiTAN-O-One said:
If its the indicator, then what causes the CPU heating? Battery indicators in all devices are not accurate even after making it "accurate". Like eg, my Galaxy Wonder had 18% battery. After reboot while charging i got 90% and lasted a few hours. But honestly, no heating issues back then.
I still am confident that its a kernel problem. Being a flash-a-holic, i didn't try the 4.4 update then cos of KNOX
Sent from mah AssForMini
Click to expand...
Click to collapse
Yes, probably the only things to do is flash a new kernel and a new rom.
But i bought only 6 months ago this f***ed Samsung, so I don't wanna loose the warranty (i love my old Galaxy Next, i could flash it how many times i wanted, because there isn't no stupid knox)
I installed the App Opp Xposed Framework, i found that Google Service uses location even if i say him to don't use it, and even if i turn off gps. So I stop him, I even stop the "keep awake" options in his menù.
But in 5-10 minutes i didn't watch any differences in battery life.
So, i risked to put off "keep awake" in "Android System" (because i watched that "android system" keep awake the phone often), and nothing it's happening now. I am charging my phone, then I will try if there's battery improvement (but i don't think)

Same issue here. Got the phone two weeks ago. Sometimes during charging it would heat up to 47C. Also is this normal battery life?
Note: Power saving is on.

Mine got to 49C yesterday at 2am before going to sleep. Literally, when I touch the screen, I feel it burning. I'm on stock ROM. The battery, on the other hand wasn't one of the worst times I had it. It went down drastically from 10%, which isn't bad compared to going down drastically from like 30% like I once had.
It may be a battery problem, and it may be a firmware problem. But I suspect that it's both. I got 2 batteries, and when I have problems with one, I turn to the other, and it's a continuous loop. I guess 4.4.4 will fix some of the problems, hopefully.
The screenshots explain everything.
Peak temperature at 49C. The constant green line (straight line) shows when the phone was off. You can see the temperature going down then.

RoyaLKurTx3 said:
Mine got to 49C yesterday at 2am before going to sleep. Literally, when I touch the screen, I feel it burning. I'm on stock ROM. The battery, on the other hand wasn't one of the worst times I had it. It went down drastically from 10%, which isn't bad compared to going down drastically from like 30% like I once had.
It may be a battery problem, and it may be a firmware problem. But I suspect that it's both. I got 2 batteries, and when I have problems with one, I turn to the other, and it's a continuous loop. I guess 4.4.4 will fix some of the problems, hopefully.
The screenshots explain everything.
Peak temperature at 49C. The constant green line (straight line) shows when the phone was off. You can see the temperature going down then.
Click to expand...
Click to collapse
Its a Samsung problem. People actually told me to steer clear off 4.4 update to get away from problems like this.
You guys should try the S5 ROM here.
Sent from mah AssForMini

RoyaLKurTx3 said:
Mine got to 49C yesterday at 2am before going to sleep. Literally, when I touch the screen, I feel it burning. I'm on stock ROM. The battery, on the other hand wasn't one of the worst times I had it. It went down drastically from 10%, which isn't bad compared to going down drastically from like 30% like I once had.
It may be a battery problem, and it may be a firmware problem. But I suspect that it's both. I got 2 batteries, and when I have problems with one, I turn to the other, and it's a continuous loop. I guess 4.4.4 will fix some of the problems, hopefully.
The screenshots explain everything.
Peak temperature at 49C. The constant green line (straight line) shows when the phone was off. You can see the temperature going down then.
Click to expand...
Click to collapse
What app is that? (1st screenshot)

ppero196 said:
What app is that? (1st screenshot)
Click to expand...
Click to collapse
Battery; https://play.google.com/store/apps/details?id=com.macropinch.pearl

Searching online I found that battery drain is a problem of KitKat 4.4.2, and that S4, S4 mini and Note 3 are the most affected by this problem. The factory reset, that is often suggested is useless. I made it 4 times in the last 2 weeks.
I even change the stock rom, from the UK 4.4.2 to Italy 4.4.2, with no improvement.
The only way is to wait an official update (if Sasmung will update again this phone), or try a Lollipop or 4.4.4 custom rom.
I could say that rooting the phone by Towel Root (knox 0x0 flashing before the old kernel) and using:
- Coolify (with this app running in background in 3 days the phone stay under the 45° celsius)
- App Opp Xposed (deny the access to position to any app and put "Kepp Away" off for a lot of app)
- GserviceFix
- DisableService (to stop some process, like the wereable process on Google Play Service)
And freezing all the useless software pre-installed, i get some little, but important, improvement
At this time I have 50% of battery with around 3 hours from the unplugged and with around an hour to use with display on in gsm mode (no wifi). Before KitKat updated this wasn't good, but if i hadn't root now i would have 35 or less percent

gian90t said:
Searching online I found that battery drain is a problem of KitKat 4.4.2, and that S4, S4 mini and Note 3 are the most affected by this problem. The factory reset, that is often suggested is useless. I made it 4 times in the last 2 weeks.
I even change the stock rom, from the UK 4.4.2 to Italy 4.4.2, with no improvement.
The only way is to wait an official update (if Sasmung will update again this phone), or try a Lollipop or 4.4.4 custom rom.
I could say that rooting the phone by Towel Root (knox 0x0 flashing before the old kernel) and using:
- Coolify (with this app running in background in 3 days the phone stay under the 45° celsius)
- App Opp Xposed (deny the access to position to any app and put "Kepp Away" off for a lot of app)
- GserviceFix
- DisableService (to stop some process, like the wereable process on Google Play Service)
And freezing all the useless software pre-installed, i get some little, but important, improvement
At this time I have 50% of battery with around 3 hours from the unplugged and with around an hour to use with display on in gsm mode (no wifi). Before KitKat updated this wasn't good, but if i hadn't root now i would have 35 or less percent
Click to expand...
Click to collapse
I would be better off with a custom ROM than Offcial Samsung Stock ROM. 4hrs of SOT (without WiFi) just with light browsing, gaming and some video watching
I do understand you guys don't wanna void warranty but I guess its better than buying batteries every month
Anyways, i guess some improvement for this is simply to wait for Samsung's update OR try out greenify. I believe Greenify can hibernate apps that causes the most overheating
Sent from mah AssForMini

For what it's worth I had similar over heating on my i9300 and my current phone i9195. I believe it mostly stems from the screen. The screen in a phone and laptop will be the biggest drain on power, by far, second to none.
Unfortunately, once a battery has experienced regular rapid battery loss from the screen being on too bright and too often, the battery becomes pretty poor at holding charge. And one of those screenshots shows the screen zapping the most... Remember, even if its on charge it's still hitting your battery for power. Now I never let the screen above 45-50% brightness.
If you're running stock and have power saver activated then turn the screen down, and remove as many unnecessary apps as possible. If you're rooted then there's plenty more you can do and my favourites are Droidwall to prevent apps from using your mobile connection and a custom kernel with app to under volt the cpu and gpu, but there's a lot more you might be able to do...

adrokon said:
For what it's worth I had similar over heating on my i9300 and my current phone i9195. I believe it mostly stems from the screen. The screen in a phone and laptop will be the biggest drain on power, by far, second to none.
Unfortunately, once a battery has experienced regular rapid battery loss from the screen being on too bright and too often, the battery becomes pretty poor at holding charge. And one of those screenshots shows the screen zapping the most... Remember, even if its on charge it's still hitting your battery for power. Now I never let the screen above 45-50% brightness.
If you're running stock and have power saver activated then turn the screen down, and remove as many unnecessary apps as possible. If you're rooted then there's plenty more you can do and my favourites are Droidwall to prevent apps from using your mobile connection and a custom kernel with app to under volt the cpu and gpu, but there's a lot more you might be able to do...
Click to expand...
Click to collapse
I put the S5 Proyect rom with Brisk Kernel and the problem persist.
It's not possibile was an hardware problem, because in Jeally Bean was everything fine.
But now it's really strange, sometimes the battery drain a lot, but yesterday night with the 10% i use it a lot to whatsapp before to see it shut down automatically. I don't kwow what to do

A battery isn't considered hardware by most as its a consumable; its not expected to last the lifetime of the phone.
Just because it was fine on JB you can't discount the battery cells failing. I assume you went from JB to KK, and not downgrade? If so i believe the screen zapping the battery too much causing the battery to begin failing holds true...ie, 6 months ago it was fine on JB but now its bad. Between then and now the battery has been hammered.