yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] bendispo:
I found a post (originally in the Galaxy S forum) that was referenced by a thread in the S II Android Development forms. It seems to finally offer a specific explanation of the Android OS usage on Gingerbread devices.

http://xdaforums.com/showpost.php?p=13247149&postcount=57

If this is true, then there seems to be nothing that can be done, other than to wait on Samsung for a driver fix.
[Galaxy S II General] sunseaker:
That looks interesting. However aren't some people reporting good battery life? If so then that would negate the driver issue unless it's a very specific combination of things that makes one device have good battery life and another bad battery life.

The thing is, does everyone with this and other problems report it to Samsung? Unless the problem is reported Samsung are not going to prepare a fix as they won't know how big the problem is.
[Galaxy S II General] Vash:
What is "good battery life"? You can't really compare people's experiences, usage patterns can vary too much. Different sync settings, 2G/3G/WiFi usage, signal quality, frozen apps, apps like JuiceDefender, etc etc. Heck, one rogue app is enough to mess things up. Adding the different ways people use their devices only makes this harder.

AFAIK Samsung is aware of the problem, they said it's 2.3.3 / dual-core related and will be fixed in 2.3.4.
[Galaxy S II General] troffers:
Better now after tweaking

At first I was getting pretty poor battery life, but have played around and am now getting this.

BTW: not rooted, wifi policy set to never, I have Tasker set to disable wifi between 9-6 Mon-Fri (at work) and go into airplane mode at midnight to 7am. I have 64% battery left after 22h 15m. 1hr 40mins on screen, about 15 mins calls and some browsing.

FYI - Baseband KE4, Kernel KE7.

Not bad I think, about the same as my old iPhone 4. Goes to show that playing around a bit, reducing the amount of widgets etc can lead to decent battery life. OS still using a huge chunk of my battery so lets hope that gets sorted in 2.3.4
[Galaxy S II General] RogerPodacter:
damn that is just horrendous. samsung MUST release some type of fix update i imagine. its ludicrous.
[Galaxy S II General] Vash:
did a factory reset last night... rooted but didn't freeze anything...

it's not bad :-)

# sent from a Samsung Galaxy S II
[Galaxy S II General] ignign0kt:
According to Engadget's review if HTC Sensation, its idle battery drain is much better than SGS2's.

Thats also a dual core phone with 2.3.3
[Galaxy S II General] darkalchemist:
Hmmm i get excellent idle time on my sgs2 although its a lot more affected on wifi with a low signal than my sgs it seems but then we all know that the sgs2 has some battery bugs... If these were fixed id suspect the idle times to be comparable.
[Galaxy S II General] rafael000:
I did a factory reset as soon as I turned my device on, because I read about these problems.

It seems to be good so far. Let's see, I'm in my first full charge now. When down 5% in 2 hours...wi-fi always on, but minimal use.
[Galaxy S II General] TheSopranos16:
You have a source for that? I'd be interested in reading what they said about the issue...
[Galaxy S II General] lugi93:
Not really from samsung

http://mobile.downloadatoz.com/news...he-dual-core-smartphones-heating-problem.html
[Galaxy S II General] pulser_g2:
Hardly a reliable source btw . Had a guide to instal cm8 on a phone... Good luck trying to find cm8 :p

Didn't see any references or citations to a fix either...
[Galaxy S II General] julian071:
There's actually a workaround posted on one of the links posted in the OP, post 290.

http://code.google.com/p/android/issues/detail?id=11126#makechanges

Checked mine under settings -> wireless and network -> Wi-Fi settings -> menu-button, Advanced, it was already set to never. Don't have a battery issue with my SGSII, but haven't checked with Watchdog or whatever to make sure.
[Galaxy S II General] svortevik:
A change in router solved the problem for me.

Android OS used to have about 50 minutes each hour with cpu time, but after replacing my Dlink router it went down to 2-4 minutes of cpu time each hour.
[Galaxy S II General] TheSopranos16:
I have the same issue. My wifi sleep policy is already "never". I'm trying turning wifi off to see if that helps the issue. I shouldn't have to switch routers to get my phone to not drain battery, but its interesting that it worked for you. Is there no other fix for this? And if 2.3.4 really fixes this, does anyone know if/when Samsung would even get that out to us?
[Galaxy S II General] C0NAN:
Will a D-Link DIR-615 also have problems with Galaxy S II?
[Galaxy S II General] TheSopranos16:
Are we even sure this is wifi related? I read a few pages of the google code threads and it sounds like it's more related to the phone repeatedly going in and out of suspend state.

This issue is really the biggest problem I'm having with this otherwise stellar phone. Really hope it gets fixed soon!
[Galaxy S II General] Pfeffernuss:
Quite true. Switched off Wifi completely, froze the relevant "power hungry" Wifi services and still got heavy battery drain and an overenthousiastic AndroidOS usage.

As far as I'm concerned it has nothing to do with Wifi whatsoever.
[Galaxy S II General] Azch:
hmm i think it's just normal I mean, well you know that there's so many apps that eats away battery life. Ya know' you can search google for battery presever guide or something.
[Galaxy S II General] balenax:
i have the dir-615 and it's the main suspect for my battery drain. i will be replacing it on monday with some other router and see how things work out.

on the other hand, i had android os around 35-40 % on stock fw and after upgrading to ke7 it went up to 60%. i now reflashed and did a factory reset after, removed the unwanted bloat with titanium backup, rooted and so far after almost 2 hours is at 10%... i'll be watching it closely...
[Galaxy S II General] Tsapper:
Yes. Yesterday my android os process started to use like

30% of battery when it was something like 10% before. I have wifi sleep set to never. Still watchdog started to alert about suspend and io processes. So it is not jusg about wifi.
[Galaxy S II General] otacon888:
I never use wifi and my android os is super high.
[Galaxy S II General] $omator:
anyone suffering from draing can post bugreport? ;)

i would like to commare it to mine
[Galaxy S II General] NIK516:
We are all waiting for the 2.3.4 update, hope it all even out soon because when this device isnt eating up juice it is very good.
[Galaxy S II General] janldl:
thought id share my experiences as I've gotten so much help from you Guys on this forum.

i have tries almost everything possible to improve my battery life previously.

updated to ke2 then to ke7

freezing and unfreezing all different combinations of apps

playing around with every single permutation of wifi data auto sync gps on and off which all didn't really help.

in particular i felt watchdog and android booster weren't helping my battery life at all so i deleted those

was still experiencing ridiculous drain while phone was awake and idle with android.os sapping all my battery and suspend and event/0 the main culprits

i decided to take the plunge and buy juice defender ultimate and the results are fantastic. i did have juice defender free previously and found that pretty rubbish bit that's just my experience.

as you can see its pretty good and i am very happy with it. seems jd has managed to halt and stop whatever misbehavior processes were using up battery.

the big drops are when i was using it as a Sat nav with gps and data.

fyi I've frozen most standard apparently as people have done

have auto sync and background sync on wifi on

all i can say is jd ultimate rocks!

happy to share my setting answer setup if needed
[Galaxy S II General] balenax:
i am now sure that the culprit is wi-fi, mostly becouse of my router . yesterday i went to visit some friends and was away from my router for like 6 hours. i was on 3g on the road and on wifi at my friend's house, on a crap zyxel router. while i was away, the andoid os was registered for like 2-4 minutes/ hour cpu usage. i came back home, it jumped to 45-50 mins/ hour and battery went down in no time, without using the phone.

today i charged the phone to 100% and started to monitor it. after 2 hours on my d-link, android os was registered for 1:39 mins of cpu time and battery went down to 92% with just 3 mins of talking and 2 sms + ckecking out fb for like 1 max 2 minutes. turned off wifi and 2 more hours later : battery was down with just 1% and android os was at 1:42 ( so just 3 minutes used).

will try a different router tomorrow, but its 100% wi-fi related, at least with my phone.
[Galaxy S II General] Vash:
Well, your usage in that screenshot is quite low, I'm pretty sure I can get the same results without JuiceDefender if I leave the phone alone for so long...
[Galaxy S II General] djet:
Same for me, two eaters: Android OS and WiFi sharing. Stock KE7.
[Galaxy S II General] rdy2go:
Ke7 stock, factory reset, android usage much lower than before.

Try before complaining...
[Galaxy S II General] nkj:
XWKE7 , getting horrible battery life even when not in use.

tried the factory reset does not seem to do much.

background data / auto sync enabled

accounts syncing

whatsapp

exchange1

gmail

exchange2

wifi set to never turn off (was recommended in one of the other threads)

almost tempted to switch back to the iphone 3gs
[Galaxy S II General] SBS_:
Turn off WiFi and see if you get the same drain. There are some problems with certain routers (namely a D-Link model)
[Galaxy S II General] $omator:
-first of all killing system processes is useless, could make more dammage to be honest

-second of all you will never have good battery life with wifi set to be always on - phone uses over five times more battery when wifi is on (that does not mean you will get 5 times more time on battery - but you will save much more energy while screen is off) - so use wifi sleep policy to turn it off when screen is off

-i have not seen a single usefull screenshot or log in here ;) and from my personal experience with drain on sgs1 i can tell you that it is probably caused by you and your not professional upgrades ;] (hate me now i know but its true)
[Galaxy S II General] Arthur Hucksake:
My phone has been idling for 11 hrs, only lost 3% battery and I have a terrible signal. It shows no visible bars, so its like half a bar or something because I can text.

All looks normal to me.
[Galaxy S II General] Seade:
Bet'cha can't replicate this battery graph! =/

Sent from my disappointing GT - I9100
[Galaxy S II General] $omator:
tell me how can you be helped if you post such screenshoot only ;)
[Galaxy S II General] Seade:
This can probably not be helped. It's merely an illustration of what some crashes can cause. Can someone confirm this by turning on the flashlight and let the screenlock engage and see if their phone crashes?

Sent from my disappointing GT - I9100
[Galaxy S II General] $omator:
thats a badly flashed phone mate ;)
[Galaxy S II General] dryspuri:
could you please guide us with proper method of flashing please!!
[Galaxy S II General] tameracingdriver:
Is that with wifi on or mobile data? I do find mobile data does increase use.

Mine drained 38% in 2.5 hours before, equivalent of 15% / hour :eek:

Thankfully since I restart its more like the level you said. I just wish I knew enough to investigate what is causing it.

Is there a tool the alerts you that something is draining CPU usage abnormally? Even if it alerts me so i know to restart that would help.
[Galaxy S II General] RyanZA:
Looking at my battery graph, when I have wifi on the bar is much more horizontal than when on mobile data, so looks like wifi on does help battery life. No sign of wifi sharing services though, since I tried a new thing:

After rebooting my phone yesterday, I went to applications->manage services and stopped the wifi sharing service, and wifi sharing manager service. It doesn't seem to have started back up since then (?).

Trying to avoid finding fixes that require root, and that one might be one to try if you have the wifi sharing issue. Freezing the app should do the same/better if you're rooted. ;)
[Galaxy S II General] tameracingdriver:
I have seen the Wifi sharing appear in my list but its never been a huge consumer of power.... yet.

I did see one called "AP Mobile" though, which I originally thought could be the same thing, but looks like something to do with "Associated Press", but I don't remember installing any such thing :confused:
[Galaxy S II General] rdy2go:
LOL I've got the same strange observations.
[Galaxy S II General] simonk83:
I'm just going to post this again so that people are aware that Google realise the issue is there, and what causes it. This is from a Google employee over at Google Code (check the first post for links):
[Galaxy S II General] RyanZA:
Yeah we know that, what we don't know is why some people's phones have good battery life and some have bad. If we could find a workaround it could help a lot. :D

Looking like it's going to be very hard to track down anything like that though...
[Galaxy S II General] simonk83:
The good news is that Google appear to have pushed through a fix to the 2.3.4 update (at least on the Nexus phones), so hopefully that'll sort us out.

http://www.google.com/support/forum/p/Google+Mobile/thread?tid=3812c1acf93b482f&hl=en

One thing I've been doing, which seems to work (but it's definitely just a temporary band aid:

I have Watchdog Lite installed, and I have it sell to alert me whenever a process uses over 30% CPU. This it does, and it's always either Suspend, or Event/0. Anyway, when I get the alert, rather than rebooting the phone, I find that if I check the Real Time CPU button (which basically makes Watchdog refresh instantly rather than every minute or so), that tends to calm down the rogue processes and sends them back to normal. Then I uncheck it. Might just be coincidences (maybe they just spiked for a second and calmed down themselves), but it seems to be working so I'm not complaining :)

Still, a hassle, and I hope it gets fixed ASAP.

From experience guys (this is my first android phone), how long does it generally take for the Android updates to be released for other phones, or is that up to the manufacturer (Samsung in our case).
[Galaxy S II General] BoostedSR20:
I've had Watchdog running for a couple days now (after seeing it mentioned here) and had it set to moderate (40%) and have never gotten an alert. I just switched it to 30%.

After freezing wifi sharing and manager my battery life has improved a decent amount, but I'm still not getting close to what my SGS1 was, setup identically.

Here is where I'm at now, only after pretty moderate usage. Still getting killed by Android OS. (which is why I don't understand why I never got an alert from watchdog) I would guess I am gonna get about 9hrs of life.
[Galaxy S II General] DocRambone:
Try disabling background data, made huge impact for me.
[Galaxy S II General] BoostedSR20:
I will do that tonight before bed so I can judge the change on a fresh charge.

Question though, won't this turn off push mail for the Gmail account? Then there is noway to setup gmail to check every so often?
[Galaxy S II General] anklud:
Maybe it's a different problem but i see a huge improvement in battery life when I disable wifi completely. (like 8 hours vs 19 hours).

If I watch at the screen with the available networks I can see that the phone is continuously scanning for new wifi even if I am already connected to one..

I also noticed that the percentage of android os stays low after a reboot until I turn wifi on. After that it became to increase no matter what.
[Galaxy S II General] NIK516:
I can also confirm this, tried it this morning, i rebooted and reset my phone to stock, the os was at 8% left it like that for an hour then turned on wifi and it started rising slowly but it is at 34%.

Before i rebooted the phone got up to 90% usage, this is just stupid do you think i can send the phone back as a defect?
[Galaxy S II General] NIK516:
Sorry to post again but i have added a thread on google code and would like users to submit info on the thread to grow awareness to the issue.

I have contacted gizmodo and endgadget via email hopping they will also post something on the issue..

http://code.google.com/p/android/issues/detail?id=16721&colspec=ID Type Status Owner Summary Stars

Thanks guys please post info about fone like i have and screen shot.
[Galaxy S II General] virussnake:
i ve been kepping an eye on the battery usage menu since this thread started and android OS has never been over 14%. i reboot my phone every 24 hours.
[Galaxy S II General] BoostedSR20:
Its crazy that some phones are suffering from this and some aren't. When I put mine on the charger android os was at 77%
[Galaxy S II General] robstunner:
Is it running on wifi when the screen is off? What does it say under the advanced wifi menu? Just a guess.
[Galaxy S II General] simonk83:
It's not the phone, it's Android. This affects a whole multitude of different phones.
[Galaxy S II General] BoostedSR20:
I've done this now, and rebooted. I'll take it off charge tomorrow and see what it does for my battery life.
[Galaxy S II General] jonrwg:
Updated my DHD to gingerbread but android os showing 3% while my SGS II 30%. both wifi on, background data on. Surprisingly my DHD drain faster than my SGS II. :rolleyes:
[Galaxy S II General] simonk83:
There's no way in hell I'm turning background data off. Defeats the purpose of having a smartphone! :D
[Galaxy S II General] sewe:
it didn´t crach it just turn off the led
[Galaxy S II General] Seade:
Yes but after it turns off the led it doesn't respond and goes completely dead.

How can I fix this if it's a bad flash? I followed the guide posted here to root and flash to XWKE2.

Sent from my disappointing GT - I9100
[Galaxy S II General] rdy2go:
Factory reset helped in my case.

Changed wifi to turn off when screen off.

Nothing frozen, ke9 stock
[Galaxy S II General] AndyCr15:
This is not always the case, no. On most Androids I've had, 3G burns much more battery than WiFi. If I had a day at home on my Nexus One for example, it would use 1% per hour, while connected to my home WiFi. If I went to work, at least 4% per hour as it was on 3G. I had the same experience if I left it on 3G at home. This means, WiFi off when screen off would give me worse battery life.
[Galaxy S II General] CandyAndy:
After updating to KE7 and doing factory reset I still get pretty lousy batterylife. Yet, Android OS takes only 10%, Android system 4% and Android core apps 3%. All together those 17%. Not so bad.

I have frozen wifi sharing, so it doesn't take anything. Display currently eats 57% which is very high although I haven't been using the phone for that long.

I just don't understand how in some reviews this phone is supposed to last for a whole day with moderate to heavy usage when I can kill the battery completely in less than 6 hours.

This is worse than my HTC Desire had and even that wasn't that great. Such a disappointment, especially because I was first supposed to buy Sensation but changed to this because has bigger battery. Now I am reading that Sensation battery life is pretty ok (better than SG2?)

F**k you Samsung..
[Galaxy S II General] godutch:
I wonder if the browser could be modded to display white on black, should save quite a bit of battery
[Galaxy S II General] rdy2go:
cyanogen mod

Not available for sgs2 at the moment
[Galaxy S II General] dryspuri:
are u on KE9, i did not see that is that newest firmware!!
[Galaxy S II General] dryspuri:
get your handset exchanged, i got mine exchanged & now i m happy!!
[Galaxy S II General] guigs91:
sorry for my english,i just want know if this it is normal for display:

display use 50% and

display:50mn

brightness autobrightness disabled because brightness is minimum
[Galaxy S II General] aurelm:
Meh.

Tested again, with all the bloatware removed and a fresh factory reste (ke7).

The android OS did not go beserk but today wi-fi sharing service went beserk. SO I removed it and it seems to be gone after it dreopped at least 10% of battery.

The line with no drop in usage is night time with wi-fi and data off. SO it should be good.

This morning I opened both wi-fi and data and it seemed ok until the wi-fi sharing thing.

so 2 hours of heavy usage (browsing with 3g, 3d games) and 18 hours total time should not be bad. the battery is 33% wich may give me another extra hour of usage.

That makes it 24 hours and 3 hours of heavy usage out of which 18 hours (daytime) with 3g and wi-fi on.

If the damn Android OS bug does not come back or the wi-fi sharing one I think it is ok

ps : what does wi-fi sharing do anyway ? After removing it and closing the process wi-fi tethering still worked. Is it another samsung crapware ?
[Galaxy S II General] NIK516:
I was told tendering also but if you say it still works then i got no idea im just wwaiting on a fix or cm7
[Galaxy S II General] fleischen:
It's an dlna feature to stream videos and photos to (Samsung) tv's.
[Galaxy S II General] rdy2go:
KE7 - my fault, sorry
[Galaxy S II General] aurelm:
so why does it pop up like that ?

Why do all (most ) apps keep services into memory, many of them prone to go wrong.

I look in processes and I see :

media hub

games hub

music hub

social hub

the god damn digital clock widget wich I don't use anyway. Why does it have a process opened ? Why would an unused widget do that ?

All of them went to garbage. I got 30-40 MB of ram mem just by removing everything that was bloatware.

I see that "android system" is made up of 20-30 processes. Maybe I should take a deeper look and see what I can remove from there. I bet once again the DRM process is useless.
[Galaxy S II General] RogerPodacter:
Now you understand why many people prefer to use only stock android like nexus phones. Its just inherent to manufacturer skins.
[Galaxy S II General] floyd0815:
I think you need the process if you are using the stock lockscreen.

Other question:

My HTC Desire needed a few seconds to active the ukw-radio, but the SGSII does it instantly. Was this on the SGS as well? Is this normal?

EDIT: Does this eat no battery?
[Galaxy S II General] wackyD:
Flashed back to KE2 and froze all the crap that came on the phone. Battery draining 10% every 6 hours in standby. Only thing that chews battery is the delectable screen.
[Galaxy S II General] floyd0815:
@wackyD

With the market-app "screen filter" you can set the brightness lower than normal.

Made a widget to set it to about 50% for indoor use.

Great app!
[Galaxy S II General] aurelm:
Why ? Ain't the screen dark enough ? I bought an amoled device for bright colors and enjoyment of watching photos and movies. The screen by default is darker than sgs1, has an odd gamma that dosn't let me see any details in the dark areas of a photos (compared to sgs 1 or pc screen).

The only thing that app is good for is reading at night in bed. I have not even noticed any difference in battery usage with brightness to minimum or maximum, the software mentions display as a main resource consumer because while screen is on it exists sleep mode and apps become active.
[Galaxy S II General] floyd0815:
IMO the auto-brightness is too bright for indoor use and it's only possible to set it manually (i know, you can long press on the title-bar...) but I want it automated - since I'm Tasker user.

I always wanted to be able to set the auto-brightness relatively (darker) and that's possible with screen filter! (+ auto-brightness with e.g. 50% off)

EDIT: but maybe it's only me, because of my glaucoma...