yashsingh1/xdaforums huggingface dataset:
[Galaxy S II General] Quist:
When you say "Power save mode" do you mean on the phone or on the router?

I did a factory reset and did not turn wifi back on. Left the phone over night and went from 100% to 99% after 4.5 hours.

I turned wifi during the day on to connect with my DIR-655 (using an access point not broadcasting its name and with WP2-PSK security). Android OS slowly crept up in the relative states as the battery went down. Let it run all the way down to shut down, then charged turned off.

Once fully charged, I powered it up (connected to wifi with the phone's wifi sleep policy set to never) and pretty much left it sit. This is where Android OS went nuts, dropping 10-20% of power per hour with Android OS responsible for 98% of that.

For me, wifi is definitely a trigger factor. Moreover from what I've tried, once it kicks in there's no real way to get it to stop (haven't turned data off completely, as I still need email).
[Galaxy S II General] dan13l:
@Pagnell - "I woke up this morning to see my battery was still on 100%" - was this with Wifi turned on?

@beppez82 - Cheers, I'll get that installed

@Quist - I'm assuming power save on the phone. I've never turned this on, so it's a candidate for being ruled out.

Can some others confirm that they've never enabled power save module on the SGS2?
[Galaxy S II General] beppez82:
Cool so seems a bad compiles wifi driver in that case..for who have massive discharge in 3g i dunno what can be ;@

Now for me android is is still high (not so much btw but more than it have to be) but the phone have a good battery life a fair more than my sgs1...so I'm more than satisfied...

But now we have to understand what is making suspend and event go high while connected to some wifi router...for me was dlynk dir-655

All OK on the Huawei echolife hg553 called also vodafone station in italy
[Galaxy S II General] DrGinge:
Just had a VERY frustrating support call with Samsung. I outlined the issue, told them with the phone sitting idle it is drained within 10-11 hours and they insisted I must switch EVERYTHING off, including:

All internet connections - both cellular and wifi

Must have the screen brightness set to absolute minimum

and basically told me that because its "a fast processor and big screen" I should only expect 10 hours maximum out of the phone - even with these settings (i.e. it being as useful as a £5 pay as you go special).

I tried to argue that something isn't right here, that I at least need a net connection to poll my email, otherwise why am I lugging around a smartphone, but they insisted there is nothing wrong with the phone!

They wouldn't listen/understand my argument that when the processor and screen are sitting idle the phone shouldn't consume the same power as when in full use, but they insisted they will.

What a bad experience....samsung UK support....YOU SUCK!:mad:

Unfortunately for me, I think this means I'll be returning what had promise to be a great phone.
[Galaxy S II General] earthdome:
^power save mode on the phone.

anyway, regarding wifi, i still get high android os usage with both wifi on and off
[Galaxy S II General] DocRambone:
New finding: got rid of "100% time without network" and the Android os time went down to few %... !
[Galaxy S II General] DrGinge:
After my first day, when the battery ran out in about 11 hours, I put power save to come on at 70% for the 2nd day.....no difference the 2nd day.
[Galaxy S II General] beppez82:
Yes same here, but u get 10-20% idle drain?

For who have it with wifi off, i can say to try a reset, cos greenpower caused me to get a such drai also in flight mode...so with all stock and without data killer apps, i say is ok 2% (can be less btw) max idle drain with lot of thing in sync (android os still high but never more the the display, yes also if i use the display for 10m and leave it in idle for 1h).

So what i can say u have to just use the process monitor widget app start a recording and see what happen to the phone (it also record ur logs), and start disabling thing one by one, better if u start from stock rom formatted sd etc, btw these is what i done for 2 days XD.

And than maybe report here what u find drinking ur juice
[Galaxy S II General] beppez82:
How u got rid of these Doc?
[Galaxy S II General] DocRambone:
Made 3 installs with repart, seem to wipe away some bug , but a full reset in the engineering menu should do the same. I post a guide later tonight.
[Galaxy S II General] Quist:
Yes, please, DrT, how did you do this?

I've always been a little dumbfounded by that stat ("Time without a signal" under Battery use-Cell standby).

It's always been 100% for me eventhough I have full signal on my operator with data enabled (and when wifi's been on for that matter).
[Galaxy S II General] DocRambone:
WOW, made a HUGE impact on the battery time, 10% drop in idle to less than 1 %! /h
[Galaxy S II General] beppez82:
cant wait ur guide to these in wich rom u are xwke2?

it say 0% also if u reboot?
[Galaxy S II General] dan13l:
Can't wait for that mate, if it's helped as much as you say.
[Galaxy S II General] Beefheart:
No mate, I only ever have wifi turned on when I need to use it.
[Galaxy S II General] simonk83:
Hmm, my time without signal is also at 100%. Weird, that doesn't make sense...
[Galaxy S II General] DrGinge:
can I add a "me too" - my "time without signal" is 100% - don't know what this means, as I definitely have a cell signal
[Galaxy S II General] beppez82:
+1 Doc we are waiting XD
[Galaxy S II General] kaassema:
I can confirm that WIFI indeed seems to trigger the bug for me...

When idling after charging, no bug yet, the battery drain is slow, from 100% to 96% in 4 hours or so...

Then I turned wifi on, fiddled around on the market, and turned it back off: battery keeps draining, with the batterygraph showing a clearly much steeper downslope compared to the slow drain during the first hours befóre WIFI was used.

A reset then seems to halt the bug, showing again a nice slow battery drain.
[Galaxy S II General] lgkahn:
I am not resetting my phone again. It takes hours to customize everything. The phone is never going into sleep mode. Thus the drain on ke2 firmware. Overnight the suspend process has all the CPU

back to my sgs 1.. till sorted.
[Galaxy S II General] darkalchemist:
Can confirm time without signal being 100% here as well! Question is, is it a firmware specific bug or an android one!
[Galaxy S II General] LBTaylor1984:
I'm sorry what are we talking about? where the hell is this time without signal on the phone?
[Galaxy S II General] rwc3b:
jealous!
[Galaxy S II General] darkalchemist:
http://code.google.com/p/android/issues/detail?id=13744

Seems like a known bug in Android...
[Galaxy S II General] dan13l:
Not quite the same bug though: they're saying 50% and we're seeing 100%, and they're talking about CDMA, not GSM.
[Galaxy S II General] darkalchemist:
I think it's similar enough and my SGS2 has WCDMA as well as GSM. There's a team of us debugging now, surely we'll get there in the end!
[Galaxy S II General] Danielfr:
Since I changed my network mode from GSM only to GSM/WCDMA ( auto), I don't have anymore a battery drain. My Android OS shows after 2 hours only a CPU usage of 6 minutes.

Daniel
[Galaxy S II General] CandyAndy:
Can't be the case with my battery drain since I already hjave it on auto-mode but I am losing the battery rapidly.

Sh*t sh*t sh*t. And I changed from Desire to get better batterylife..
[Galaxy S II General] earthdome:
pic 1 - without signal 0% yesterday with wifi always on

pic 2 - without signa 65% today with wifi on for 4 hours 30 minutes and off for 8 hours
[Galaxy S II General] fishton:
Have you tried the trick proposed here http://xdaforums.com/showthread.php?t=1079136 ?

just tried, I ll let you know.

This morning, after 5h using my phone, Android was 18% ... let see !
[Galaxy S II General] kreoXDA:
So you are saying "Time Without Signal" is merely how long the phone spent without WiFi?
[Galaxy S II General] earthdome:
Yes. That's what happen to me at least. Not sure is it for everyone else. Can anyone confirm it?
[Galaxy S II General] kreoXDA:
I would, but my phone is at 0% can't even turn it on now :) Will test later.

Your numbers however prove it conclusively enough. I wonder why Doc claimed removing "Time Without Network" made his phone go from 10% loss in idle to 1%. Simply having WiFi ON does that? I do not think so. Unless the wireless signal is so crappy it takes 10 times fewer power to autosync over Wifi as opposed to H+.
[Galaxy S II General] dan13l:
I don't see how that can be the case.

Time On is currently 13h 37m 9s on my device.

Midnight until 8:45 - good wifi and cell signal.

8:45 - now: wifi off while I'm in the office.

Time without signal is 100%.
[Galaxy S II General] dan13l:
Doc did say a factory reset may do the same thing as his fix. I've tried doing a factory reset from within the phone settings, but not from recovery. Maybe clearing the cache as well as the data/system partitions is important - I'm not sure on a technical level what the differences are between the two methods.
[Galaxy S II General] DocRambone:
Tried with another gmail account, still same android cpu use.
[Galaxy S II General] RyanZA:
Strange... I (and I think most others judging by the battery thread) can't duplicate it. Which firmware are you using?

I am on XWKDD (stock, came with phone)
[Galaxy S II General] rdy2go:
Samsung Account is suspect #1 -- factory reset, no more configuring automatic updates, let's see what's going to happen with "Android OS" usage
[Galaxy S II General] DocRambone:
I am on XEKE1, but had the same issue on KDD
[Galaxy S II General] RyanZA:
Not sure if you can assume that so quickly -- you only found out about the background data setting now. Background data may be the issue on XEKE1, but not on KDD.

ie. let's try keep this scientific and try to make sure we don't skip any clear data points! :D
[Galaxy S II General] DocRambone:
Yes, have to try it more. I have a feeling its google account related, did google implement any new security features in 2.3.3?
[Galaxy S II General] jimsey:
I had mine running full kdf rom from samfirmware and battery life was much better (25% a day with lots of use), fleshed back to stock uk kdd rom yesterday and the phone is eating juice. (50% with hardly any use)
[Galaxy S II General] RyanZA:
So KDF might have some of these bugs fixed already? Guess I should test it... Can anybody else on KDF confirm either

a) no delay on wake when device is not plugged in

b) no runaway android OS process or wifi sharing process
[Galaxy S II General] BoostedSR20:
I've been following along all day, trying everything listed in the thread. I'm still getting eaten up by Android OS and WiFi sharing.

Also I've never noticed any wakeup lag, plugged in, un-plugged, anywhere. I'm on KDD, stock lock screen, and ADW EX with TW frozen.
[Galaxy S II General] simonk83:
Woke up this morning to find an alert from Watchdog telling me that the Suspend process had been using 64% CPU for a time overnight.

This is the problem guys, as confirmed by Google. I'm not sure there's much we can do about it until the bug is fixed.
[Galaxy S II General] BoostedSR20:
I was able to eliminate wifi sharing using battery by freezing it and wifi manager. But android os is still a killer.
[Galaxy S II General] beppez82:
Did you tryed to freeze ota updater?
[Galaxy S II General] BoostedSR20:
No I will try that next... actually I don't see that anywhere listed...
[Galaxy S II General] beppez82:
If you have logged into it.. it work in background.. to mine seems OK now I will give a better report tomorrow
[Galaxy S II General] BoostedSR20:
I don't see it listed anywhere... and I've never checked for updates...
[Galaxy S II General] jkrestes:
I have got s2 rooted and debranded (all from xda site) and my android system consumption is somewhere around 4-6%... no apps frozen but using juice defender and advanced task cleaner pro and setted most of apps to be killed after screen off.

Hope it helps
[Galaxy S II General] Guitarfreak26:
I'm getting big battery drain too guys but mine says 42% display and 14% android os. Problem is I'm on 44 after 4hr hours! Granted I did some web browsing and 5 min navigation but still that's pretty bad
[Galaxy S II General] Guitarfreak26:
Forgot to add my brightness is on 0%!!!!
[Galaxy S II General] NIK516:
Guys try this i did it last night and my os dropped down to 19% from 76%.

Ok i drain my battery down to self shutdown0% then i charged it overnight uninturupted till it was 100%.

Will so far so good.
[Galaxy S II General] BoostedSR20:
I've done that twice since owning the phone.
[Galaxy S II General] Quist:
Weird. When wifi is on is when the time without signal is counting - i.e. if you always have your wifi on, your time without signal will show 100%, and conversely, if you never have wifi on, your time without signal will show 0%. This is kind of a misleading stat, because it's not at all time without signal that is being counted.

So unless DrT has found the root problem of this symptom, this symptom appears to only confirm what we are beginning to realize now. Keeping wifi off will keep the Android OS problem in check. Of course that's no solution in itself coz the device is meant to be used with both.

Hoping that the Doc has found a real solution here.
[Galaxy S II General] Quist:
I'll reiterate what I've said like three times here already.

A factory/hard reset "solves the problem" - until you set up wifi again.

Meaning it is just a temporary fix.

PS. A factory reset from the menus does clear the cache.
[Galaxy S II General] Quist:
Check your running services - is wifi sharing and wifi sharing management still on?
[Galaxy S II General] DocRambone:
Something to try:

Factory reset and make the initial set-up with 3g/2g data only (not wifi).

Add accounts etc with only 3g data.

Monitor the battery status "cell standby" Should show less than 100% without signal.

Leave it in idle for 10 min and the check the "android os" time
[Galaxy S II General] dan13l:
Nope, they're frozen. I double checked, and they're not in my running services.
[Galaxy S II General] Quist:
I can confirm this behavior. I was testing the claim that a hard reset coupled with denying any kind of Google backup/restore, when I did a hard reset and set everything backup WITHOUT wifi and left it run overnight.

My battery drain was under 1% per hour. Unfortunately, as soon as I set up wifi again, battery started dying much faster.

I let it go to zero charge and recharged turned off. When I restarted the phone with wifi on (still no google backup etc), Android OS went nuts again.

Today, I've tried turning off wifi, but it had no effect. Discovered that wifi sharing and wifi sharing manager were still running. If you kill these processes when wifi is on, wifi sharing comes on again, but not wifi sharing manager. With wifi turned off, killing these processes means they stay down.

Since that time, my battery drain has dropped down to 1-2% per hour. As a side effect, the "time without signal" stat is declining.

At boot, I immediately lost 8% battery charge. Then, for two hours with wifi on, it dropped another 20%. That's when I turned wifi off - continued to drop rapidly, killed the two processes, slowed - for past two hours, I've lost 4%. My "time without signal" went from 100% to about 50% and the longer I'm off wifi, the further it drops.
[Galaxy S II General] Nuhvok:
These findings sound promising! Shouldn't be very hard to fix by Samsung.
[Galaxy S II General] DrGinge:
I've been doing some experimentation of my own - I now have Spare Parts, Watchdog lite and JuicePlotter installed. About an hour and a half ago (at about 72% battery) I switched off Power Saving and put wi-fi onto the "Always" on mode...and there is a noticable slowing of the drain - down to 67% now, which is about a 2 to 3% drain an hour, where previous I was running 8 to 10% drain per hour....I'll leave these settings on for the rest of the day...if I can make it to bed time then this is an improvement.
[Galaxy S II General] sunseaker:
I don't have a GS2 yet but a couple of thoughts. Here's my 2c worth for what it's worth.

It's looking like this may be a wifi driver or wifi power management problem. Am I correct in saying that not everyone is seeing this battery drain behaviour, i.e. some phones are managing a low drain rate even with wifi and other services on? I ask because there is another thread about bad wifi / signal strength on the GS2 and again not everyone experiences that. So I'm wondering if the two are related in some way, i.e. if you are one of the unlucky ones with bad wifi signal do you also suffer from the battery drain and visa-versa?

Do Samsung even have a place where users can report bugs? I've never had a Samsung phone so am not familiar with what support or bug reporting facilities they offer for their phones. If not then perhaps alerting the prominent phone review and blogger sites may get Samsung to sit up and take notice and acknowledge there is a problem they need to fix.
[Galaxy S II General] beppez82:
THANKS DOOOOOOC

Problem solved cell standby gone to 0.

Doc No. 1 :D
[Galaxy S II General] DocRambone:
GREAT :)

Its strange but the first setup of the phone needs to be done in 3 g/2g data mode.
[Galaxy S II General] Quist:
Have you gotten the problem to stay away when you ultimately turn wifi on?

Mine was great after a hardreset, but the bug resurfaced once I went back to wifi.
[Galaxy S II General] beppez82:
Doc if u go back to wifi no signal time go up or stay down?
[Galaxy S II General] DocRambone:
No problem so far, been on wifi on and off all day, switched at least 10 times now. Total android os time 12 min 15 s ( 8 hours)

Total time on (cell standby) 3 h 30 min (rest on wifi)

Idle drain 1% /h
[Galaxy S II General] DocRambone:
No signal time stops when on wifi

Dont care about the % , only that its less than 100 ;)
[Galaxy S II General] beppez82:
can u post a screenshot of ur batttery usage stats?

to see how is android os?
[Galaxy S II General] dan13l:
Maybe I'm being dumb, but I don't quite follow when you say that first setup has to be done on 2g/3g - isn't it always done on 2g/3g because at that point you can't connect to wifi?

Also - you're saying we don't need to reflash with Odin, we just do a factory reset from settings - privacy - factory data reset?
[Galaxy S II General] RogerPodacter:
i just want to give you guys in this thread hope. i just upgraded my nexus one to 2.3.4, been unplugged for 7 hours 24 min now, still at 92% battery, and Android OS only used 48 seconds of CPU, at 2% total at bottom of the list.

not only that, but everyone is reporting that standby current draw is insanely improved now. all last night my n1 only pulled 3 mA of idle current, which is just insanity. up till now its been around 7-8mA during idle.

so i think the SGS2 just needs to be upgraded to 2.3.4 to really kill this bug.
[Galaxy S II General] Spawn_Xe:
i'm actually seeing a moderate improvement just with the latest SGS2 firmware upgrade. So.. if there's more savings to be had with 2.3.4, bring it on!! :D
[Galaxy S II General] walda:
u can search for wlan at the Setup to avoid data traffic over your Provider.

sent from my SGSII via T*patalk
[Galaxy S II General] cmd512:
It's so bizarre a few folks are having these crazy battery drain issues, when others aren't seeing it at all. My phone has been idling for most of the morning (~4 hours) with 2 pull and 2 push E-mails checking at 30 minute intervals and a handful of text messages/phone calls... still at 91% battery remaining. Compared to my SGS out of the box with a stock ROM, that's pretty damn good.
[Galaxy S II General] darkoroje:
The fix in 2.3.4 was in Nexus-specific WiFi driver. Those changes therefore do not apply to the SGS II and it would be up to Samsung to fix the WiFi driver, provided of course that that is the cause of the problem.
[Galaxy S II General] beppez82:
MMM at a certain point time without signal started increase again on 3g after a reboot and some app frozen...

same on wifi it raise can u confirm these Doc?

Cant understand really when it go down...
[Galaxy S II General] DocRambone:
What wifi router do you have?
[Galaxy S II General] beppez82:
i have a dlynki dir-655 that drain my battery in idle...dunno why but suspend and event/0 go high with these and a Huawei that is ok...but i dunno wich wifi protocoll it use is a voip modem given from my isp to call and use adsl
[Galaxy S II General] DocRambone:
Yes, i have a dir655 to, it triggers the battery drain... b/g and n bands gives same drain

Tested a netgear and linksys router without any problems!

Very strange.
[Galaxy S II General] beppez82:
AHHH ok i posted it a while ago Doc lol btw time without signal go down with 3g enebled or with wifi cant understand...

Now mine is raising in 3G btw i cant see any difference in suspend and event/0 cpu usage...and android os is more high than normal (but never more the display) so i think is not related to the time without signal....
[Galaxy S II General] DocRambone:
No, i think there is multiple causes, for me, a 3g first setup cures the high android os bug, but the dir 655 wakes it again.

After a day i have android os at 8% (14 min) with display at 56% (2 h 30 min)

Seems ok

The time without signal will be high if you use wifi, look at the Time on, should be same as the 3g network time
[Galaxy S II General] beppez82:
Im seeing same time on battery and the same time on cell standby...

mmm maybe the frozen of some app and the reboot with cache cleared didnt helped that much, also the restore with titanium of the apps maybe XD
[Galaxy S II General] darkalchemist:
I just realised my Galaxy S has 10 mins Android OS use for like nearly 4 days on battery!!! My SGS2 has 15mins for 6 hours!! I didn't realise it was so bad before!
[Galaxy S II General] airwater9:
I logged it today here if you're from the UK and Ireland. Get Samsung on the case and log it so they prioritise it. This thread is getting to be the longest and most useless that I've ever trawled through.
[Galaxy S II General] kreoXDA:
the link - it is leading to generic support web site.

is there a link to your POST directly? or you have a private support request case? I thought you posted something on some forum at samsung.
[Galaxy S II General] yhrn:
+1 with the bug and a DIR-655
[Galaxy S II General] =RBL=:
I'm sorry guys, but I don't think the problem has anything to do with Wifi. My phone is on Wifi all the time when I'm at home and I don't think battery's going down even by 1%/hour.

I have posted my battery stats before here, but will post again. See the Wifi bar? Those stats were on KE1, I'm now on KE2 with exactly the same results.
[Galaxy S II General] Quist:
Do you have a D-Link DIR-655 router?

We've discovered that most of us with the worst problem get it triggered by this router. This means something non-standard is present either in the Samsung WiFi driver or in the router itself.
[Galaxy S II General] DocRambone:
100% sure that dir-655 and sgs 2 has issues with each other
[Galaxy S II General] dan13l:
I'm using a Netgear though. So it's not exclusive to that.

Wifi definitely causes the high Android OS problem. Overnight (7 hours) at home its used nearly 6 hours of CPU time, at work (8 hours) with wifi off, twenty five minutes.

I'm now testing at home with wifi off to make sure it's not a cell tower type thing, but I'm almost certain its wifi that causes it. Whether its a bad driver or some app that's misbehaving with wifi on, I don't know, but wifi features strongly in the equation.

Finally - yes, the thread is long, yes there's no current solution, but unless we keep hammering away in this we'll never suss it out. If you don't like it, just wait until you see a thread that says it's been solved.
[Galaxy S II General] =RBL=:
I can't belive all of you with the problem have the same router :confused:

I got BeBox which is thompson router and don't have a problem with battery drain. Report your routers people.
[Galaxy S II General] Furbious:
Good call, I've added a service request about it using the site also. Maybe if we get more people to do this, they might take the hint :)