yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] blue265:
Mine seems fine on 3G or EDGE but if I turn Wifi on, Android OS goes through the roof. (I have also froze wi-fi sharing manager, etc).

I can test this easily but charging to full and then unplugging and leaving the phone in standby. If on Wifi, the Android OS (with barely any display use) will be 80% or so. Then I charge again to full, remove the phone put it on 3G and put phone in standby. Android OS will only be 15 percent or so and overnight I'll only lose about 2 percent battery (no account sync on). If I leave my phone on Wifi, my battery will go down 10 percent or more overnight. Its not a huge battery drain but will definitely make it last a considerable amount less because of this issue.

Too bad we are all noticing different ways to make it happen - otherwise we could find some common ground and figure it out if at all possible before 2.3.4
[Galaxy S II General] busky2k:
Do you have data turn on or off during this time?
[Galaxy S II General] Tinderbox (UK):
I have 34% battery left after 1D20H , I have 40% display usage, 18% android os, I keep the display at the lowest setting, which is fine in the house, If i need it brighter i increase it, I have wifi, gps, blue-tooth and mobile data turned off, I turn them on as needed , I have animations disabled, I use black wallpaper, I don't have an battery monitoring software running, or any software that leaches power life weather apps and alike.

I have a low to medium power usage with the setting`s above.

As everybody knows the display is the biggest power drain, If you are in a sunny location you are going to need the display brightness at high or maximum and that is going to kill your battery.
[Galaxy S II General] thesludge:
The longest amount of time i have had with mine is 23 hours and 16 minutes on 100% charge

The shortest space of time i have had is 7 hours from 100% charge.

I have had to turn off a lot of stuff to get an average of 10-12 hours and the display originally was 78% and I have manged to reduce it to 30%.

However as someone else has said on here, i dint buy this phone to turn everything off or run it at its lowest settings.
[Galaxy S II General] simonk83:
Well duh :) Welcome to the point of this thread :D
[Galaxy S II General] Unamrakerag:
I have had the phone for exactly 7 days now, and I am very happy to share with you all that for the 1st time it has lasted for more than a day on single charge.:p

--->I have not rooted my phone

--->Nor have I installed any apps like juice defender

--->Nor do I use task killer at any point of time

I just let my phone do its own thing.

I would call my usage patter moderate, I am not a heavy user.

I have the Data Network Mode enabled all the time except when I am sleeping, I am connected to EDGE network, as I don't yet have 3G.

The apps which I keep on running all the time are

1.Whatsapp

2.Nimbuzz

3.NoLED

4.Antivirus Free edition

5.Background data sync always on

I check my mails using the manual sync method, I have disabled the auto sync, although the background sync option is always on.

I use the opera mini web browser mostly for web surfing as its quite fast over the EDGE connection. I do not stream music or videos I let my laptop do that.

Other uses for the phone besides calling and messaging obviously, is to listen to music approx 1Hr via Headphone and watching some videos on its gorgeous screen 30-45 min daily. Brightness is turned down to minimum when indoors and at about 30% when outdoors. Auto-brightness is off.

I keep on changing the wallpapers , use both live ones and static.
[Galaxy S II General] popy2006:
Strange thing this night!!

11:00 pm i started charging and went to bed.

Today in the morning it was really, really hot and showed "full" on the top.

Pluged off the charger and it showed directly "1%" battery left !?!?!?!?

As i said it was really, really hot :mad::mad::mad:

Now pushed out the battery and let it cool down.

Try to charging it again now ... seems good ... battery level increases and currrently ar 13%.

This piece of **** driving me cracy :mad::mad::mad:

cu

pOpY
[Galaxy S II General] CandyAndy:
Hello. So what do you say about my today's usage

. As you can see the android usage is very little just 5% and screen time also not that big. Still I got this enourmous drain in a couple of hours.. Sucks..
[Galaxy S II General] metalican:
Hi all.

I have had my SGS2 for about 2 weeks and recently I have experienced a huge battery drain during the night, like most of you guys (about 20-25%). I decided to look into it by monitoring the phone using SystemPanel. This is what have found:

- When the phone is idle there is a constant CPU activity about 2-3% (check the first screenshot).

- The CPU activity is mainly used by 2 system processes: events/O and suspend (check screenshots 2+3).

- The fourth screenshot shows the CPU activity of events/O process. Notice the activity between 0:00-8:00.

- The last screenshot shows the CPU activity of suspend process. Again notice the activity between 0:00-8:00.

I am not sure why these 2 system processes use that much CPU activity when the phone is idle and how I can fix it, because since they are system processes I cannot stop them. FYI, Wifi and auto-sync is turned off.

Anyway, just wanted to share my info and hope somebody can come up with something, if possible.
[Galaxy S II General] yaronAD:
YEP...it eats the buttery without salt:o

but it is the android problem...

and the success of android wont make the soloution faster :mad:
[Galaxy S II General] Nishiyama:
Ok, so what i have seen in multiple replies in this thread is in tune with what i have been experiencing with my SGS2.

Phone is all original with only a few apps so far, but after about a week of testing i have concluded that for me it is wifi and wifi only that is the culprit.

if i am home and leave wifi on (connected to my home network) it will drain in about 5 - 8 hrs regardless if i use it much or not.

But if i am away where i'm not connected to wifi or i turn off wifi whilst home the battery has lasted for around 16 - 18 hrs.

Think this pic says it all..
[Galaxy S II General] RogerPodacter:
I don't have a solution. But I do have a tip, in your last screen shots, cluck that compare button if you didn't know. It shows some more info.

I also use system panel like you do on my nexus one. Over night the total CPU usage hovers between 0% and 0.3%. Its great, it shows literally blank spots of zero graph bars. And only 3 items appear in the list, system, system processes, and current widget. This is on cyan 7.

So there is hope as android can and does attain proper idle performance. It will stay at 4-5 mA current draw.
[Galaxy S II General] jjdoctor:
has this issue been resolved. its such a long thread with so many different ideas but none of them have same method. can someone link me to a solution post if present within this thread.
[Galaxy S II General] carymouse:
+1! If there are any solutions present, is it possible to have a summary? I read through 5 pages of "me toos" before skipping to here.
[Galaxy S II General] popy2006:
No there is no solution!

the summary of this thread is that everybody hopes a 2.3.4 update will fix Android-OS drain issue.

2.3.4 has improved battery also on other phones.

So let us hope samsung will get up their asses and fix the battery problem for their killer phone!

cu

pOpY
[Galaxy S II General] daleski75:
I agree it seems to be when you use wifi even turning it on for a bit and then turning it off can hammer the battery.

Wifi sharing on mine consumed over 25% of the battery in under 2 hours.
[Galaxy S II General] Sleepycat3:
Your screen brightness must be set very high. Yours is consuming 22.22% per hour of display on, whereas mine consumes 5.66% per hour. I use only 8% brightness.
[Galaxy S II General] szav:
How can you did that :( Help me ! My android OS draining battery about 30 -40 % usage a day
[Galaxy S II General] goodwinod:
battery life

I was able to create what I think most of you are describing by installing the program "Android Battery Monitor". I got rid of the problem by uninstalling the program. I originally had the program installed with KE7, and the battery life went down so I uninstalled it. After I uninstalling it the battery life improved greatly. Since then I have got to know my Galaxy2 better. I love the program (if it didn't drain the battery) so I tried uploading it again. Now I was on KF2. I started experiencing the things that people describe in the forum: high percentage of the battery use by the Android OS, the events/0 and suspend using a ton of battery, and the battery going down a lot when I was not using the machine (screen off). I uninstalled again and the Android OS went back down to less than 10%, the events/0 and suspend are using substantially less power, and I get less that 1% drain every 2 hours when it is asleep. Perhaps others have a background program that is being used like this.

This helped my battery. Hopefully it will help others. Let me know...
[Galaxy S II General] popy2006:
My Android-OS also drains in about 12 hours.

I dont have the same programm as yours.

But the following programms i have installed monitors the battery state:

"Battery Life" (Widget)

"Settings Profiles"

Have freezed those apps with titanium backup and looked at the services, they dont running anymore.

Lets hope this is a workaround...

I will post my results.

cu

pOpY
[Galaxy S II General] popy2006:
Battery draining, as always :mad:
[Galaxy S II General] RogerPodacter:
i'm pretty sure the solution and problem was identified earlier in this thread. ccertain routers are not working properly with the SGS2, so using wifi with a certain model of routers (which a few were posted already) cause this android OS bug to happen and drain a high amount of resources.
[Galaxy S II General] rXpCH:
I don't know about that because 3g is draining twice more power than wifi for me... So 10/12 hour max if I don't use it too much.

rXp
[Galaxy S II General] bakewelluk:
This definitely seems to have affected a fair number of people, but from the sounds of it there are a few other things triggering OS bugs too. It'll be a nightmare to isolate what is doing it for who though, hence such a long thread!
[Galaxy S II General] (•.•):
This should help! (bumped it for new readers! rebump it, if you see it in a few weeks)

And 1 more great tip,

Root your phone and get the app "autostarts" and remove all apps that don't really needed from autostart!!!

Because even if you remove it there, you can run it anytime later without problems, but the removed apps will not run in backround all the time for no reason or even some harmful reason...

I cutted my used ram in half and more that way.

Clean start, will give you several improvements!

So go for it!

I posted it allready and my system allmost drained nothing from my battary, just like 2-3% in a allmost full battery drain.

(never let the battery run out of power, or you'll will most likely damage it)
[Galaxy S II General] Eclap78:
My Android OS usage is @ 11% after having the phone on for 15 hours. I'm currently running Litening Rom 1.5 with the fix.
[Galaxy S II General] RogerPodacter:
if you guys are seeing this issue while connected to only 3g with no wifi use, then ok. but from all i've seen it only seems to be wifi related issues when the Android OS bug shows its ugly head. i hadnt noticed any non-wifi posts.
[Galaxy S II General] rXpCH:
I'm the first ? Because with 3g... 6 hours MAX !
[Galaxy S II General] harrists:
From my finding, disable following features can totally kill the "Wifi Sharing" service and help battery performance a lot.

Accuweather Widget (preloaded on GS2)

Uncheck Settings -> Enable current location

Voice Command & Voice Talk (preloaded on GS2)

Uncheck Settings -> Use location
[Galaxy S II General] rantzzz:
How do you go into settings for these?
[Galaxy S II General] popy2006:
I have tried every rom and my battery always drained very fast (~12hours).

My last rom was litenin v1.5 (KF2) updated from v1.4 (KF4).

The battery also drained very fast.

yesterday i did a full wipe von v1.5 (KF2) and restored my apps (no system settings) with Titanium Backup.

Until now my battery hasnt drained. 31% in 16hours (69% remains).

Seems a full wipe worked for me until now.

But Android OS process takes up 53% usage...

Any news on 2.3.4?

cu

pOpY
[Galaxy S II General] Sleepycat3:
Of course it would, because everything else is taking up less usage. The % numbers all add up to 100%.
[Galaxy S II General] startoss:
Android OS seems to go battery hungry with Wifi to Dlink 655 Router.

I had my SGS2 on for 8 hrs normal usage with %15 usage only. Once I connect to the dir655 router for wifi, Android OS tops the usage chart at 70% and drained 20% battery under 3 hours. I didn't even turn on the screen at all so I am pretty sure it's the router!

*Included image. Red markers shows the time I connected to the dir655 Wifi without any phone usage.
[Galaxy S II General] popy2006:
On my desire the Android OS process just takes up 3-5% with same usage!!!

Its definitely a bug!!!

cu

pOpY
[Galaxy S II General] Pfeffernuss:
I also have that router but no drain at all. Well, 7% battery loss in over 9 hours, so that's quite normal. I seriously doubt it's the router's fault also.
[Galaxy S II General] troed:
I am still on stock KE2 but my SGS 2 gets better and better by itself in power consumption.

I use it on my international travels and read news with it in the waiting times to departure, check emails, sms, answer, do some phonecalls and read books on the plane (Kindle reader/Black background).

NO GAMING though !

So my SGS II lasts about two days, batt drain when not used less than 1 % per hour.

Strangley I cannot se any android bug .............................
[Galaxy S II General] popy2006:
it seems the bug just came up when using widgets.

http://xdaforums.com/showthread.php?t=1135033

Not the widgets itself are buggy, but some widgets seems to trigger the Android OS drain bug.

Maybe you have removed some widgets?

cu

pOpY
[Galaxy S II General] mariosergio2112:
The Android OS here is draining only 4-10%, using a lot of widgets. The battery life is normal here for my use. Something like 15h a day.

Edit

Im havig the problem too... Now im monitoring better.
[Galaxy S II General] troed:
I have none of the preinstalled widgets running (nor weather, nur buddies, nor AP news, no Music/Game Hub, Twitter etc.) and stopped them by Autostart app. I am still non-rooted.
[Galaxy S II General] fontburn78:
Well I'm onto my 2nd S2 in a week. 1st one got really hot for no reason so got a replacement. 2nd one came and this is what I've got.

On Orange UK

Charge phone fully, turned on battery starts to drop staight away with "Android OS" using everything.

Turned off everything and I mean everything.

Deleted all homescreens

Removed all widget and shortcuts

Double checked all settings so they were super effecient

Installed my usual apps that I had on my HTC Hero

Charged again to 100%, unplugged, turned on, put it on my desk. Checked it this monrnig and as you can see from the picture.

I've done 2 soft resets inbetween - might try a hard reset.

Phoned up to get it replaced again. I'm not rooting a brand new phone.
[Galaxy S II General] tjtj4444:
Your pictures are missing a very important point: How much battery did your phone use during the night? The battery statistics in SGS2 is not bug free itself.

Your problem with the first phone happened to me as well l, i e the phone got hot without reason after some usage, that was fixed by restarting the phone, happened maybe twice a week. This is gone for me with KF3 firmware.
[Galaxy S II General] RogerPodacter:
Earlier in this thread its already been proven that certain routers cause the android os bug, while others eliminate the bug completely.
[Galaxy S II General] aroy7:
I have this problem too, but what really surprises me is how on earth Samsung could release a phone with such a massive widespread problem!!!!!!!
[Galaxy S II General] holdup:
No issues regarding android os for me, although battery life is crap and after rooting for some reason the battery meter stuffed up, counter is actually going up, should rooting cause such problems
[Galaxy S II General] Pfeffernuss:
Can cause the bug. I have this specific router and battery drain is almost nill. So it must be a combination of things, it's most definately not 100% the router's fault.
[Galaxy S II General] fontburn78:
My phone was 100% charghed at 11pm-ish, then in the morning status said battery was at 36% and the picture shows the drop.

My new one has arrived busy charging. Fingers crossed.
[Galaxy S II General] mariosergio2112:
My next smartphone will be a HTC.

Im monitoring the phone here, and im having this problem too.

Touch screen lag, battery life. This is the second time that samsung desappoits me. The first was with the nexus s.
[Galaxy S II General] alien0101:
How did u root SII? Is it safe to root? If anything wrong in rooting can cause bricking the device.
[Galaxy S II General] winwiz:
there is a guide in the development section bud
[Galaxy S II General] dan13l:
I would go along with the wifi theory.

I had really crappy battery life on Monday in the office (not connected to a wifi network, signal strength average), but yesterday working from home (wifi connected, signal good) I had 40% battery left where the day before there was none.

Today I'm going to a really sucky signal area, so it'll be interesting to see how the phone copes. I may disable background data and 3g (not much point when the signal is so poor).
[Galaxy S II General] tameracingdriver:
Just to throw a spanned in the works about the WiFi issue, mine was draining yesterday (wifi off) so restarted, was fine for a while, did not re-enable WiFi, unplugged this morning, battery drain started immediately, from a full charge to 95% in just over 5 minutes with no use and Android OS showing 43%.

Had to go back to my HTC Incredible S until a fix is found.
[Galaxy S II General] DocRambone:
The android os bug is not connected to the wifi bug...
[Galaxy S II General] Hendrickson:
No issues here, always under 10% OS usage. I have removed all the samsung bloatware however. http://xdaforums.com/showpost.php?p=13679890&postcount=6
[Galaxy S II General] LBTaylor1984:
While were all ravving about the OS usage, it's worth remembering it's a %.

if a user has 10 apps running the OS will have a lower percentage. or if there screen is a set to 100% brightness, like the screen above, the display and mytracks is taking up a bigger chunk of power, this will force the OS percentage down, along with the other elements running. The only way you'll know if the phone is using a high amount of OS is to have the same phone running different ROMS, with the default configuration, as anything else has too many uncontrollable variables. tbh you won't find out if it's high or not unless the test is more controlled.
[Galaxy S II General] simonk83:
Watchdog makes it fairly clear. I regularly get alerts that the Suspend and events/0 processes are using up to 70% CPU each.
[Galaxy S II General] LBTaylor1984:
*downloads watchdog*
[Galaxy S II General] jonrwg:
Sigh.. my DHD beat my SGS II battery life !! I setup both on same setting. I play both device together and after 10hours my SGS II on 57% (Battery life), DHD 78% (with live wallpaper). And my DHD android OS always at 3%. I updated my DHD to Gingerbread (lazy want to wait for official update). SGS II rooted, DHD not rooted. Thinking of doing an exchange with CPW and complaint to them about battery life. LOL.
[Galaxy S II General] anklud:
Maybe there is even another Android os bug not related to wifi.

Actually on my phone the Android os percentage seems quite related to the wifi bug.

I was wrong in my previous post, as soon as i enable wi-fi i see the Android os percentage in the battery usage screen raising, when i turn it off the percentage starts to get lower.

obviously it is a percentage so all this take some time.
[Galaxy S II General] jonrwg:
Mine seems to have no effect. Wifi on wifi off = same. :(
[Galaxy S II General] tameracingdriver:
Ditto :(

(10 chars)
[Galaxy S II General] tonynz:
I have a SGSII and get >30% Android usage.

However, with moderate usage, I can still easily get 24 hours of standby time.

Could it that it's just reporting wrong?
[Galaxy S II General] agarzas1:
I recomend to do a master reset.
[Galaxy S II General] tameracingdriver:
No.

24 hours standby for a phone is pathetic. My incredible s will easily last a week, that's even doing syncs with Google mail. However, at times my s2 wouldn't even last 6 hours.
[Galaxy S II General] tonynz:
http://samsunggalaxysforums.com/showthread.php/4598-Galaxy-S-II-Owners-Whats-your-battery-life-like

Most people get below 24 hours.
[Galaxy S II General] kreoXDA:
I saw the screen shot in your post at google. You seem to be in an area with a bad signal, showing just 2 bars. The phone would constantly scan in search of better signal, and waste power on that. I do not know though if that would appear under "Android OS".
[Galaxy S II General] send2toonie:
I'm getting horrible battery life too.

Android OS is always the culprit, always takes 1 spot and is >30%.

Also, I've noticed I get the syncing icon in the status bar all the time. Its there 99% of the time. On wifi, on 3g, on edge, wifi off, etc... reboot starts fine, then about 10 seconds after reboot it shows up and stays there.

Could this syncing be the issue? At least for me?

I've owned a htc hero, nexus one, dell streak, nexus s, and now galaxy s2 so I'm familar with android, usually it syncs then its gone.
[Galaxy S II General] tonynz:
How bad is your 'terrible'. How many hours/days do you get with moderate usage.
[Galaxy S II General] tCC:
I'm back on my Nexus S, next phone will be the next Nexus, everything is running as it should
[Galaxy S II General] htc9420:
Suspend is at the heart of all issues

Suspend triggers the events/o and is the culprit of this bug. I know that's been said before, all over the net.

There no unified suspend for the dual core in kernel....and I think some calls are wrong handled, still investigating...:eek:...I think the suspend is never finished - maybe it's on the loop- and here is the answer for the wake up lag also...pretty sure

I just wanted to add some more pictures, maybe they will help...

I am on stock KF3 and Watchdog lite warns me every two hours or so about what's messing with the cpu
[Galaxy S II General] rXpCH:
Look at this. I did nothing but have the wifi turned on !
[Galaxy S II General] kerman19:
My battery life was pretty dire when I first got the phone, I uninstalled/froze the crappy samsung hub stuff, and Wifi-sharing, and I'm on O2 and I've disabled fast dormancy, which for me made a BIG difference.

HSDPA has been on when sleeping for push updates, and WIFI policy is set to sleep when phone is off.

My usage today; about 40mins phone calls, a handful of text messages and about 4 hours of music at half volume. Also I've got facebook push notifications (if you can call them that!), Twitter updates hourly, push email via g-mail and beautiful widgets weather updating every 30 mins.

I'm on KE1, also.

Edit: I do NOT use any sort of task killing, I don't kill tasks manually, I'm using Widget Locker and ADW Launcher with no other modifications, not even setcpu.

Edit 2: I've used my phone with WIFI always on, and that was connecting to a D-link 615 router with no notable battery drain. Although it's worth pointing out that my 615 is running DD-WRT. Having said that if you have one of these routers, and you are NOT using DD-WRT, then you need a poke in the eye!

Phil
[Galaxy S II General] dryspuri:
I am on KG1 2.3.4 android os is still hogging CPU:eek::eek:
[Galaxy S II General] miskoslav:
Me too, installed VillainROM 2.0, which is 2.3.4 based, hoping it would lower system CPU usage. Nothing, still same. Battery drained in 1 day, with very modest usage.
[Galaxy S II General] d3l1:
You do realize that your screen is awake most of the time? You can clearly see in your picture when the phone is active and when the screen is on, and both match a lot so there is your reason for the battery drain. After ~4 hours of screen on your battery should be nearly empty.