Finally the wait is over. Android 2.3.4 firmware for SGS2 was leaked by ficeto. This reportedly solves the Android OS Battery issue.
http://www.darkyrom.com/community/index.php?threads/rom-base-sgs2-2-3-4-darkyrom2-xxkg1-base.4059/
XDA Thread: http://forum.xda-developers.com/showthread.php?t=1159920
Download Link Stock XXKG1 : http://www.multiupload.com/2EMBQMYF4V (via ficeto)
Well I'm installing it right now and will update with initial impressions!
To install via ODIN choose: (Note: This will wipe your Apps but SD Card and Internal Storage Data will remain intact)
Phone - MODEM_I9100XXKG1_REV_02_CL1034110.tar
PDA - CODE_I9100XXKG1_CL349526_REV02_user_low_ship.tar
CSC - GT-I9100-CSC-MULTI-OXAKG1.tar
There's no need to use the .pit file and do not tick mark re-partition.
To Root:
Flash with any CF Root based Kernel
Flash back to Stock KG1 to remove Yellow Triangle
Stock KG1 Kernel Link : http://www.multiupload.com/UNNM2UKPBC (via intratech)
Pass: [email protected]
Edit:
Ok so the Screen On lag is gone when you wake up via Home Button, but still there when you wake up via Power Button.
Google Talk Video support
Android OS eats up considerably less battery.
Will add more changes as I find.
Edit 2:
Well can't say that the Android OS battery hog issue has been totally fixed. Android OS still shows a lot of usage. Android System process on other hand seems to have gotten down.
Battery @ 87% (with Juice Defender running)
Apparently the Android OS Battery issue is a problem caused by Samsungs Drivers which hog the CPU even while the device is in standby mode.
More info here : http://forum.xda-developers.com/showthread.php?t=1079201 (via athulag)
http://www.darkyrom.com/community/index.php?threads/rom-base-sgs2-2-3-4-darkyrom2-xxkg1-base.4059/
XDA Thread: http://forum.xda-developers.com/showthread.php?t=1159920
Download Link Stock XXKG1 : http://www.multiupload.com/2EMBQMYF4V (via ficeto)
Well I'm installing it right now and will update with initial impressions!
To install via ODIN choose: (Note: This will wipe your Apps but SD Card and Internal Storage Data will remain intact)
Phone - MODEM_I9100XXKG1_REV_02_CL1034110.tar
PDA - CODE_I9100XXKG1_CL349526_REV02_user_low_ship.tar
CSC - GT-I9100-CSC-MULTI-OXAKG1.tar
There's no need to use the .pit file and do not tick mark re-partition.
To Root:
Flash with any CF Root based Kernel
Flash back to Stock KG1 to remove Yellow Triangle
Stock KG1 Kernel Link : http://www.multiupload.com/UNNM2UKPBC (via intratech)
Pass: [email protected]
Edit:
Ok so the Screen On lag is gone when you wake up via Home Button, but still there when you wake up via Power Button.
Google Talk Video support
Android OS eats up considerably less battery.
Will add more changes as I find.

Edit 2:
Well can't say that the Android OS battery hog issue has been totally fixed. Android OS still shows a lot of usage. Android System process on other hand seems to have gotten down.
Battery @ 87% (with Juice Defender running)

Apparently the Android OS Battery issue is a problem caused by Samsungs Drivers which hog the CPU even while the device is in standby mode.
More info here : http://forum.xda-developers.com/showthread.php?t=1079201 (via athulag)
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