I usually leave the N810 in flight mode and muted at night. Twice in a month (or so) I awake to find the battery completely dead. I've read some threads here -- most solutions say something along the lines of "do not leave any app open" (I don't), "check if your wifi ap support psm" (flight mode), "reflash" (already done it, but I cannot spend a month with the tablet in a useless state to fully test it).

Since it may also be one of my little helper applications I've coded for it, I tough I may give it a try and try to debug the cause.

First step: a program which regularly dumps raw battery voltage (kcbatt) and 15 minute average load:

On a "good" night (snippet):
On a "bad" night:
As you can see, the average load on a "bad night" is never 0. At least, I can confirm this is not a "kernel crashes and tablet spends rebooting the whole night", which I suspected (since I'm using custom kernel).

So right now I need an application which can tell me who or what is causing the extra load, and I was wondering if someone has done something similar already. Or some idea of what to log to identify the culprit application (periodic top? ordered by current cpu usage, used cpu time?).

As I said, it happens hardly often so trial-and-error is nearly out of the question.

http://talk.maemo.org/showthread.php...tat#post263392