Database Users

[Q] Battery drain from Android OS, suspend, and event/0

I know this issue has been posted in forums for other devices, but I haven't seen anything about it for NC. I did try to search the NC forums but couldn't find anything that seemed to address this problem.
I am using MIUI 1.7.22. I have noticed significant battery drain due to Android OS (in battery stats), suspend (in the systempanel app), and event/o (also in systempanel). I have disabled auto-sync and any apps that appear to be likely culprits (those that might attempt to download data). This problem seems to appear with wifi on or off, and when on, I have tried both setting it to never turn off and to turn off when the screen is off. Initially I was experiencing battery drain due to cell standby, which I took care of by disabling the telephony provider, phone, and mms apks. I know many don't believe this has an effect, but I did it anyway. The cell standby drain is gone, but now I'm fighting the drain due to these other factors. Has anyone found a fix for this?

After scouting around for info, I have tried some suggestions seen elsewhere: rebooting and wiping dalvik cache. So far today I haven't had any Android OS, etc. issues. Standby life with screen off is as it should be (for now and hopefully forever)--very slow battery drain.
This is with wifi set to never shut off, which I prefer.

Suspend etc. came back last night although not as extreme as before. Hopefully some other folks will have things to add to this thread. I will continue posting progress info as I learn more about this.

From the code.google.com forums:
Confirm heavy battery drain with enabled Location & Security -> Use wireless networks / Use GPS satellites. I've disable both options and now my battery life is normal.
With enabled "Location & Security" options battery eaten by "Android OS" process (about 40-55%).
I will try this and report back.

Disabling WIFI and GPS in location/security had no effect. There appears to be a google process that prevents the system from sleeping.

I was still experiencing random battery drain due to Android OS, suspend, event/0 after switching to cm7. One suggestion I read was to disable calendar sync, as this appears to be a runaway process that attempts to connect to the server constantly without allowing the device to sleep. Doing this allowed me to get through the night with very little drain and the Android OS, etc. processes were finally behaving (within normal limits).
I'm not sure if anyone is reading this thread but I will continue to update until I figure out the solution, as I imagine this problem will become more noticeable to others who are equally frustrated with this issue.

Having same problems on my galaxy s2. Lots of people have this problem and think it's a problem with the os. What os version are you using?

memphisuklf said:
Having same problems on my galaxy s2. Lots of people have this problem and think it's a problem with the os. What os version are you using?
Click to expand...
Click to collapse
Right now I'm using cm7 (2.3.5) but I was using MIUI before. Turning off calendar sync has worked well so far.

I had bad battery drain in the past and no deep sleep. but what worked for me was not to use any live wall paper. this fixed my deep sleep issues. for the battery drain, re-set your battery stats and re boot a couple of times for the stats to settle down. also check google map and latitude. in latitude just log out. un-checking sync in my yahoo email app also helped with my battery drain. my wifi is set at, off with screen. I went from 20 -30% drain in 7hrs to now 1-3% in 7hrs
I hope any of this info can help
cm7 n146

Thank you, boxcar. I had tried all of those things (froze live wallpaper, reset battery stats, reboot, froze maps and latitude) but the only thing that worked for me was unchecking the box for calendar sync. Email sync and wifi appear to be non-issues--no difference between off or on. Evidently this google calendar sync bug is a known issue (that very few people seem to know about!). I hope google will fix this soon.

I also have same problem on my Galaxy S2. These two(events/0, suspend) drain many battery, 14% one night, without WIFI, GPS, Bluetooth.
I'll keep on tracing this issue, and share the result in this thread.

arrowliu123 said:
I also have same problem on my Galaxy S2. These two(events/0, suspend) drain many battery, 14% one night, without WIFI, GPS, Bluetooth.
I'll keep on tracing this issue, and share the result in this thread.
Click to expand...
Click to collapse
Turning off autosync seems to help the most (although setting WIFI to turn off when the screen turns off appears to help, as well). I tried using an autosync toggle but just turning it on at all seemed to result in a gradual creeping up of the Android OS, etc. problems. Manual sync of calendar and perhaps gmail and contacts seems to be the way to go. For some reason, exchange mail set to push results in no problems. The other trick I've found is to go to applications, then calendar and calendar storage, and force stop, delete cache, and THEN manual sync of calendar (reboot, recovery, wipe dalvik, fix permissions are good ideas, too). When I flash nightlies, I go through this process and the offending processes work as they should. If I don't, problems appear sooner or later.

I've had my nook on for 9 hours now, WIFI on (off with screen off) and 30 minutes of display on time. I've lost 9%, so I think I'm on the right track. This is how it should work, I.think. Of course, the results SHOULD be the same with autosync on, but manual sync for good battery life is an acceptable small tradeoff in my opinion.

Sincitybronze said:
I've had my nook on for 9 hours now, WIFI on (off with screen off) and 30 minutes of display on time. I've lost 9%, so I think I'm on the right track. This is how it should work, I.think. Of course, the results SHOULD be the same with autosync on, but manual sync for good battery life is an acceptable small tradeoff in my opinion.
Click to expand...
Click to collapse
For the noobs in the audience, how exactly does one turn off autosync? Where is it located?
Thanks in advance.

Puddynose said:
For the noobs in the audience, how exactly does one turn off autosync? Where is it located?
Thanks in advance.
Click to expand...
Click to collapse
Menu, settings, accounts and sync (I leave background data checked).

I found part of the root cause, maybe some old application - can work on new version, but drain many battery. Today I uninstalled the 'Android photo widget', then only 1% battery has been drained within 2 hours when standby. Not totally solved the issue, but seems OK.
I guess you can also try this, find another 'bad' application which drains your battery.

Well guys, I'm not sure if I'm the last Nook Color user to continue fighting with this super annoying headache (I know SGS2 users are, too), but I think I'm on to something. I thought calendar sync was the culprit (and perhaps it was), but the Android OS drain (featuring nemeses suspend and event/0) would not go away and the arrival of this problem continued to be (apparently) random. I had an idea that, if the calendar sync kept alternating between suspend and event/0, perhaps this was due to old events that caused the sync process to continue longer than it would normally. So, based on this idea and logic, I changed my exchange e-mail account settings to sync email from the last month rather than to sync all mail. Looking at my work e-mail history, I realized I had e-mails in various folders and sent mail from as far back as 2001! Although it's nice to be able to access all e-mail history, perhaps the polling services were constantly monitoring the activity of super old emails and folders, which caused the suspend and event/0 processes to flip out. I don't know if this is the way Android actually works but it seemed logical to me. Well, for the last 24 hours, I have intermittently checked my cpu activity through systempanel, and what do you know, when the device is not being used, suspend and event/0 work as they are supposed to and Android OS stays low in the battery % list. PLEASE let this be the fix! I know there are other factors that contribute to the acting out of these processes, but on a stripped down device with no autosync or widgets and no out of control services identified in systempanel or watchdog, there can't be many other explanations. I'm curious if others with this problem have similar settings on their email accounts. In all the forums on different sites (and I've read a ton of them), I've never seen anything like this mentioned.

http://code.google.com/p/android/is...c=ID Type Status Owner Summary Stars&id=16721
Please vote there, and, may be, Google will fix it.

For those still following this thread, here's a tip. Use Gemini app manager (in the market). This has been one of the best tools I've found for managing wakelock issues and battery drain during standby. It allows you to identify apps that start up on their own (more than you think) and prevent them from starting randomly. In my experience this has been a huge cause of the standby drain problem showing up as Android OS, suspend, and event/0 in battery monitors. I'm currently sitting on 81% battery remaining with over 1 hour of screen time after 21 hours since my last charge. I know it's not a lot of usage but it's the standby time that's fantastic.

boxcar8028 said:
I had bad battery drain in the past and no deep sleep. but what worked for me was not to use any live wall paper. this fixed my deep sleep issues. for the battery drain, re-set your battery stats and re boot a couple of times for the stats to settle down. also check google map and latitude. in latitude just log out. un-checking sync in my yahoo email app also helped with my battery drain. my wifi is set at, off with screen. I went from 20 -30% drain in 7hrs to now 1-3% in 7hrs
I hope any of this info can help
cm7 n146
Click to expand...
Click to collapse
I've a Galaxy S2. Tried everything, except disable autosync. Was losing 30-40% battery at night. So far since turning off google sync I'm getting about <1% battery use an hour. Will see if it continues. Thanks.

Stopping services from Task Manager helps battery

Recently been getting battery drain while on Idle. This drain I tend to notice at night. My phone can idle duriing the day but does not drain battery.
I recently disabled Android system IQ agent .. and it seems to have helped at night after rebooting and stopping that service.
I also noticed when you go to task manager and go to settings there is an option to stop services. I checked Facebook (51 services wth). Google Play Books , Magazines, and Movies\TV. I also checked Google play services (65 services).
Believe it or not my phone seems to be running fine and my battery life is a lot better.
Now I set my brightness at 47% (not auto), Google Now is enabled with Wifi and mobile location. Google backup is enabled (most are unchecked including app data) Email is manual sync.
Just thought I"d pass this along. YMMV.

Thanks for your tips. I noticed random battery drain these few days, no idea what it is, high battery drain when idle, and it happens randomly. Will try and report back. Thanks

smallgreenbear said:
Thanks for your tips. I noticed random battery drain these few days, no idea what it is, high battery drain when idle, and it happens randomly. Will try and report back. Thanks
Click to expand...
Click to collapse
What's the exact name of the apk / the service? Afaik I do not have any matching process so far...

Inexplicable battery drop; no distinct partial wakelocks.

When keeping my phone on idle during the night, it dropped by around 30%.
I have installed BetterBatteryStats.
The largest user of the battery is "Android OS", according to the battery graph in the settings menu. However, in BBS, the largest partial wakelock is Connectivity Service, which was on for only ~6 minutes.
However, under CPU states, it says that the CPU was idling at 250 MHz for many hours?
This is undoubtedly some sort of phantom battery drain. It has occured for many weeks during the use of the phone.
In addition, with 'Wakelock Detector', it too says that the largest wakelock is usually for around 6 minutes, by Facebook more often that not. However, the total stats say that the phone was awake the entire time, and it has not entered Deep Sleep at all.
I would greatly appreciate your help and tips. Thanks

cald said:
When keeping my phone on idle during the night, it dropped by around 30%.
I have installed BetterBatteryStats.
The largest user of the battery is "Android OS", according to the battery graph in the settings menu. However, in BBS, the largest partial wakelock is Connectivity Service, which was on for only ~6 minutes.
However, under CPU states, it says that the CPU was idling at 250 MHz for many hours?
This is undoubtedly some sort of phantom battery drain. It has occured for many weeks during the use of the phone.
In addition, with 'Wakelock Detector', it too says that the largest wakelock is usually for around 6 minutes, by Facebook more often that not. However, the total stats say that the phone was awake the entire time, and it has not entered Deep Sleep at all.
I would greatly appreciate your help and tips. Thanks
Click to expand...
Click to collapse
You could try ds battery saver from Google play i use it and loose about 3% over night 7 hours

Yeah this looks weird.
I'm no BBS expert, but what I would do is, disable everything. Weather widgets and so on, Facebook sync and whatever else you have syncing in the background. Basically make it a dumb phone temporarily by disabling all the stuff you have running.
Then reboot and let it sit for an hour without touching it.
Check BBS again, choose "since boot" and look for partial wakelocks and battery consumption.
If it seems OK, turn something back on, for example add a weather widget and enable Facebook sync again. Don't enable too many things, just one or two! Reboot. Let it sit for an hour without touching it. Check BBS again. If the result now is again worse than it was before, you know that something you just added or enabled is causing the drain.
If everything seems OK, enable something else, whatever it may be - an RSS reader syncing, Instagram, Flipboard, Skype - I don't know what you have on your phone. Reboot and let it sit, check BBS again.

10 hours of WiFi on and WiFi running. There's your phantom drain.
Let me guess, you have scanning enabled in Wifi settings?

jaythenut said:
You could try ds battery saver from Google play i use it and loose about 3% over night 7 hours
Click to expand...
Click to collapse
Kiahnlliya said:
Yeah this looks weird.
I'm no BBS expert, but what I would do is, disable everything. Weather widgets and so on, Facebook sync and whatever else you have syncing in the background. Basically make it a dumb phone temporarily by disabling all the stuff you have running.
Then reboot and let it sit for an hour without touching it.
Check BBS again, choose "since boot" and look for partial wakelocks and battery consumption.
If it seems OK, turn something back on, for example add a weather widget and enable Facebook sync again. Don't enable too many things, just one or two! Reboot. Let it sit for an hour without touching it. Check BBS again. If the result now is again worse than it was before, you know that something you just added or enabled is causing the drain.
If everything seems OK, enable something else, whatever it may be - an RSS reader syncing, Instagram, Flipboard, Skype - I don't know what you have on your phone. Reboot and let it sit, check BBS again.
Click to expand...
Click to collapse
Thanks for the detailed advice. I'll disable everything, reboot, and then keep it for the night. And I'll install DS Battery Saver.
ShadowLea said:
10 hours of WiFi on and WiFi running. There's your phantom drain.
Let me guess, you have scanning enabled in Wifi settings?
Click to expand...
Click to collapse
Nope, I'm afraid not.

UPDATE
I did as you advised before, disabling everything. The drop over the night was only 10% this time, but this inexplicable drop persists nevertheless.

I had the same thing happening yesterday night. When my phone is drained, I usually charge it in the evening, reboot and then let it sit for about 5-6 hrs with everything except NFC off. Normally, I have a battery drop within those 5-6 hrs of about 1-3%. But yesterday morning after the same procedure, I had lost 30%. I did a reboot then and battery usage went back to normal. So I charged my phone yesterday night and did a reboot, and surely enough I only had 1-3% of battery lost over night. Strange.

Android OS Wakelock killing the battery!

Hey guys,
I've been having an S6 Edge+ for a couple of days already but there seems to be an issue with the ROM. I'm getting a lot of battery drain from the "Android OS" and I'm losing up to 5% - 7% per hour in standby.... I have even re-flashed the entire ROM and factory reset two times... still the same.
I've disabled Google's Location History and Google Now but this did not help...
My previous Galaxy S6 was also running the latest ROM but there were no such problems...
Has anybody else experienced such an issue and do you have any ideas?

OrionBG said:
Hey guys,
I've been having an S6 Edge+ for a couple of days already but there seems to be an issue with the ROM. I'm getting a lot of battery drain from the "Android OS" and I'm losing up to 5% - 7% per hour in standby.... I have even re-flashed the entire ROM and factory reset two times... still the same.
I've disabled Google's Location History and Google Now but this did not help...
My previous Galaxy S6 was also running the latest ROM but there were no such problems...
Has anybody else experienced such an issue and do you have any ideas?
Click to expand...
Click to collapse
Check if any sync is stuck in loop, sometimes this kills battery very easily. If all else fails check with some app like GSam.

Lucky8890 said:
Check if any sync is stuck in loop, sometimes this kills battery very easily. If all else fails check with some app like GSam.
Click to expand...
Click to collapse
Unfortunately GSam does not produce too detailed information without Root access and it only says Android System and lists all the services that are under it...
The interesting part is that after several re-flashes with the same firmware, the wakelock disappeared...
Now I get 76% to 80% deep sleep...
Go figure... Probably some stuck sync as you mentioned...

OrionBG said:
Unfortunately GSam does not produce too detailed information without Root access and it only says Android System and lists all the services that are under it...
The interesting part is that after several re-flashes with the same firmware, the wakelock disappeared...
Now I get 76% to 80% deep sleep...
Go figure... Probably some stuck sync as you mentioned...
Click to expand...
Click to collapse
Ah great... I also had similar issue previously with Calendar sync, couple of flashes and it went. Now happily rooted

Android OS Wakelock killing the battery! ...... solved
OK, im not too savvy with settings and systems, just sharing what i have been through. I too had a major battery drain problem on my S6 Edge+ , giving me abt 8-10hrs of use after a full charge. Even during the nights with everything off and power saving enabled i would lose abt 50-60% battery over 8 hours. ..... caused by Android OS ....... it would keep the screen awake for hours even with the screen off .... ( dont know how that worked) ..... tried a factory reset but didnt help. Then rooted the phone and downloaded wakelock detector and installed it as a system app. Installed greenify and doze ..... last night lost 4% over 11hours with wifi and 4g off and power saving enabled which is a drastic improvement. Facing one little problem that images do not get downloaded (automatically or manually) in whatsapp with wifi in use. Will use the cell for a few days and post again abt how the battery is holding up and if there is any other performance issues.

If you want to save battery, try this app:
https://play.google.com/store/apps/details?id=com.kunkunsoft.packagedisabler
It show all RAM usage of each app, you can disable any app in Bloatware (samsung default app) list to save power
This app run WITHOUT ROOT

App standby and Doze problem in M.M.

Hello:
App standby in developer option is showing all my app active, even the calculator, fm radio, adobe reader, it is supossed to inactive them if i don't use them and there is a lot of apps that i never used and they are "active". All my apps have set to optimize in battery and i was having better battery life in L.L.. Perphaps performance is a lot superior on marshmallow. In another hand, Doze is not working, my device idlle is eating 1% or more a hour.
Does anyone having this issue?
I have no autosync but notification on with whatsapp, badoo, happn, tinder, facebook, facebook messenger and precisition set to accurate. No games, just chrome an apps allready named. I am getting 12hs of baterry with 5-6 hs of Sot.
Now i have disable personal data on google play store, google play service and motocare in security.
Thanks in advance!

idle is draining more than 1% because when the device is idle the location services and fb notification services are still running in the background.

By default Doze doesn't kick in until your screen has been off for 30 minutes and then it checks to see if your phone is motionless - if it isn't (ie. it's in your pocket and you are walking around) then the 30 min timer kicks in again.
This is, btw, an absolutely over-simplified description. Basically if you are checking your phone every few minutes or walking around with it in your pocket, it's not going to Doze.
In your case, I wouldn't worry about what is active/inactive, instead I'd look at what wakelocks might be causing your battery drain. An app like "Wakelock Detector" or "Better Battery Stats" can tell you this but you have to be rooted.
Did your phone come with Lollipop and subsequently updated OTA to MM? If so, and you haven't done so already, a factory reset would probably help (or at least eliminate one possible battery drain cause).

You have Badoo, Facebook and Facbook messenger with location set to accurate + 5 hrs of SoT!!!!! 12 hours is a Miracle!!!!
What do you expect more? Sun, Moon and The stars?

yekollu said:
You have Badoo, Facebook and Facbook messenger with location set to accurate + 5 hrs of SoT!!!!! 12 hours is a Miracle!!!!
What do you expect more? Sun, Moon and The stars?
Click to expand...
Click to collapse
Thanks all for your answers!
-Update via OTA, factory reset, wipe cache.
-Allready know how doze works, doing test in the nigth, phone on a desc, idle for like 9hs.
-Same apps than in L.L but worse battery. In L.L these apps didn't keep my device awake, now they do. Y checked and the one that make my device awake was Messenger. Uninstalled, tested and device didn't awake with screen off. Like 2 hours laters, same test, now facebook start keeping the device awake... I am checking manually because i didn't root it. I am trying too to see if this problem has to be with high presicition on location service or just facebool and messenger apps, but ****ing tinder don't work with battery saving ubication. I know all are ****ty apps but i love to **** strangers hahahahahhaha.
In the other hand, i had read that in nexus phone and other M.M phones in the developer options app didn't use figure "inactive", in my phone all apps are active and can't toogle to inactive!
Again, thanks a lot for your help!

Also, dissable a system app called motorols notification service, didn't know what it do but was with google play services an Dm services in not optimizing apps. Anyone now what it is? All functionality work the same!

Hi. Don't you have a problem with Facebook Messenger notifications? I set it to not optimize, but my messages are not received immediately. Sometimes even after 5 minutes after turning screen off I don't have notification and must turn screen on.

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