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Old 06-16-2012, 07:17 AM   #1
uboot
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Posts: 418
Karma: 75216
Join Date: Nov 2011
Location: old europe
Device: Kobo Mini, Sony PRS T1
Exclamation Battery drains over night - possible cause!

Hi folks,

I had my T1 battery drain over night occassionally and tried many things to solve this like using advanced task manager to auto-kill apps when screen off, permit apps from using wake locks via permission denied app, etc. but this didn't solve the issue.

I'm using BetterBatteryStats app to track down this issue and found the reader often not going to deep sleep, but have almost equal awake time and screen off time (select other in drop down menu to check this). Furthermore, there is a kernel module named switcher causing lots of wake ups (select kernel wake lock to check this).

Well, I didn't figure out what this switcher module is for, but it seems that the issue happens when:

1.) the reader is powered off
2.) connect charger -> reader switches on and charges
3.) disconnect charger when fully charged

From now on it seems more likely that the reader won't really go to sleep when screen is powered off.

If I do a reboot, everything is back at normal. Switcher module does not cause wakeups anymore.

I suspect that connecting the charger with reader powered off triggers some bug in the kernel.


Please fill the poll, that would help a lot to track this issue down further.

Last edited by uboot; 06-16-2012 at 07:22 AM.
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