[maemo-users] Battery life VERY short on N810, last OS2008...

From: Eero Tamminen eero.tamminen at nokia.com
Date: Mon Apr 21 13:47:56 EEST 2008

ext Tony Green wrote:
> On Monday 21 Apr 2008, Giacomo Tufano wrote:
>> After installing the last revision of OS2008 (I don't really know why I did
>> it, because I had no problem on startup) battery life is very, very short. I
>> go from full battery down to automatic shutdown in a night...
>> I tried reinstalling the OS, then I tried reinstalling the OS and not
>> restore backup (but Favorites, but I suppose this will make no difference).
>> No luck.
>> In system log I have *many* couple of lines saying:
>> EAC mode: play enabled, rec enabled
>> followed by
>> EAC mode: play enabled, rec disabled
>> Repeating every 5-10 seconds and never stopping...
>> The lines are starting after the MMU and omapdsp init (after ca. 20 seconds
>> from log startup) and never ends.
> It certainly sounds like it's doing a lot of work. I've found that some 
> applications hammer the battery just because they're loaded, even if they 
> aren't apparently doing anything; the Ogg Vorbis player being a case in 
> point. If I didn't close it after use in the evening, I'd wake up to a flat 
> battery in the morning.
> A good way to see what's actually causing the problem is to open a terminal 
> and run "top" - that will show you the CPU usage of the various processes.

One should note that any constant CPU usage, even 0.1%, is enough to
ruin use-time.

I would recommend running the "top" (or "htop") from SSH so that one
isn't confused about the XTerm updates. Also, applications using
maemo-launcher show up as "maemo-launcher" in top.  The real application
name can be seen with:
	cat /proc/PID/cmdline

If the application is "hildon-desktop" then it's one of the applets
draining the battery.

	- Eero

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