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

From: Eero Tamminen eero.tamminen at nokia.com
Date: Mon Apr 21 19:14:22 EEST 2008

ext Giacomo Tufano wrote:
> On Mon, Apr 21, 2008 at 4:58 PM, Eero Tamminen <eero.tamminen at nokia.com> wrote:
>>  One possibility is a WLAN AP with broken power management, but then
>>  things shouldn't get that much worse with newer OS release.   Another
>>  possibility is some process using network often.
>>  Could you try using "Offline mode" option from the power key menu?
>>  If it helps significantly, then the issue is related to network.
> I'll try this evening/night and I'll get back tomorrow with the results...
>>  Have you enabled RSS updates?  Do you leave e.g. Browser window
>>  open when you don't use the device?
> No (I hate programs polling automatically) :-). The only program
> polling is the gmail notifier...
>>  What applets you have enabled in Home?
> Internet search, web link (no change on standard URI), Tableteer info,
> clock and Internet Radio (never used, sitting idle).

What about the Statusbar applets?  Do you have an account set up
and are you online?

>>  If you do following from SSH after screen has blanked:
>>         strace -p $(pidof hildon-desktop|cut -d' ' -f1)
>>  Is there any activity?
> I got (very fast) after the command:
> gettimeofday(whatever) = 0
> ioctl(3, FIONREAD, [0]) = 0
> gettimeofday(whatever) = 0
> poll(
> and then nothing else...

So I guess you don't have any "cpuload" applet either.
Many of them could be implemented badly i.e. polling even
when the screen turns off.

I would disable any applets that you don't use. If you reboot after
that, you've saved a bit of memory too. :-)

> To answer your question in a later email (so to try to save
> bandwidth): the device is not in R&D mode...
> It was before the upgrade, but I disabled the R&D mode after an email
> from you a week ago, or something like that explaining the problems
> with power management in this mode.
> Thinking about this, I did two things: upgraded the OS AND disabling
> R&D mode. But I think the latter can't be the problem, no?


> btw: I disinstalled Canola (the program is very complex, it is a
> candidate for problems/bugs).
> I'll try (in this order):
> leave the tablet "as is" (to test canola);
> if nothing leave the tablet with net disabled;
> if nothing I'll try to kill the metalayer-crawler (but I had no
> problem before, on N810 or on the 770 I used before this one and this
> tablet used to have power for 4 to 7 days)...
> If nothing the only other thing I can do is to reinstall OS2008 and,
> then, add an application every 2-3 days to isolate the battery
> offender...
> If there is something else I can try, feel free to suggest other
> option (I'm open). :-) If there are no other suggestion I'll post a
> success when I found the root cause...

Thanks, your effort is really appreciated!

> Thank you all for your help and support,

	- Eero

PS. This is more of a note for others.  The Nokia FM-radio applet for
N800 can currently drain the battery a bit too.  AFAIK it should be
fixed when the next release comes out.

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