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Recently, most Samsung Galaxy S2 users who are already upgraded to the latest Android 4.0.3 Ice Cream Sandwich (ICS) talking about the problem of a wakelocks as caused by the Audioout_1. This has been noticed by using Better Battery Stats on the new ICS firmware with the Galaxy Nexus, causing the battery draining fast, while when listening Audio like Google Music, the Sirius/XM app or perhaps just happens when doing nothing at all. So, if you'll also newly upgraded your Galaxy S2 to the newest Ice Cream Sandwich firmware and experience this kind of issues too, this might help you to solve that problem. This reportedly occured on firmware with build number I9100XWLP2, I9100XXLPQ and I9100XXLP7, other carrier branded version like T-Mobile and Vodafone with firmware build I9100BOLPD  and I9100BULPC and on later version were not already been tested.

According to some users experience that the AudioOut_1 Partial Wakelock appears to be connected to the Touch Sounds and Screen Lock Sounds options in the phone's Sound Settings. So, to disable or shutting down the Touch Sounds & Screen Lock Sounds in Settings will fix the the battery draining problem.

What is AudioOut_1 basically?

"AudioOut_1" is a Wakelock that is basically a kernel process that funnels data from audio apps to the audio hardware. It's what processes audio from say, Pandora or Slacker Radio, and passes it to the phone's audio hardware. (from toms-world.org)

Here's how to fix the AudioOut_1 Partial Wakelock problem:

Go to > Settings > Sound
Uncheck this options:
"Keytones"
"Touch sounds"
"Screen lock sound"


I just left the "Ring and Screen Tap" vibra option" on mine.
I tried it and it happens that my Galaxy S2 went in an hour losing only 1% of the battery and the results the WakeLock percentage for AudioOut_1 goes down as I check back into BetterBatteryStats. Unlike before that I have about 10%-15% battery drain even when my Galaxy S2 is on idle mode. So, just try it out. Enjoy!

If you had experience and somehow had trouble with the rapidly draining battery of your Samsung Galaxy S2 (SII) by AT&T. In most recent reports that the new AT&T Samsung Galaxy S II had a poor battery life.
Others says that this is due to a poor system OS or some bugs issues that one of the main reason why your phone drains its battery so fast.

So, how to get your Samsung Galaxy S2 I777 improved the battery life performance?
Here's a few tweaks we gathered so far and shared by Singuy1234 who already had his Samsung Galaxy S2 battery life problem fixed.

My phone is no longer draining massive amount of battery life when idle (3-5% after 7 hours of idle), android system usage is now down to 5-15% instead of 78-97% from before.

My fixes.

1. Turn off data syncing
2. Turn off wifi while on the road (so wifi doesn't constantly look for signals).
3. Clear memory

Yes, att installs a lot of bloatware that constantly update for changes.

If killing those services AND disabling data syncing doesn't help your problem, then you have a kernel problem (like myself).
If this is the case, do the following:

1. Take phone back to AT&T and get a replacement
OR
2. Re-flash your android with the STOCK kernel found here

http://forum.xda-developers.com/show....php?t=1286432
OR
3. Reflash with cognition x2 (reported to solve a member's problem, I didn't try this myself).

You can read the whole story at XDA-developer. We'll hope that Samsung will release a  new firmware update that fix for this battery draining issue a soon as possible.