[maemo-users] N900 consumes too much power

[From: Patrick Vranckx]

Hi,

Don't know if it can help but I had a similar problem.  It was caused by a
bug related to auto-completion. My battery lasted only a few hours...

Have a look at this thread:http://talk.maemo.org/showthread.php?p=1020718
It worked for me.


Patrick



On 08/07/2012 11:25 AM, Eero Tamminen wrote:
> Hi,
>
> On 08/07/2012 04:20 AM, ext Cedric Cellier wrote:
>> Of course offline mode is not normal. I suggested it
>> for testing :) So that whatever software is the culprit
>> it can no longer drain the battery very fast. If you can't
>> stand several days in offline mode and without top reporting
>> a process that's heavy on the cpu
>
> It doesn't need to be that heavy.
>
> Even a process that constantly wakes up just at 1s interval,
> (which shows only as 0-1% of CPU usage in top) will
> reduce device idle use-time from one week[1] to a day.
>
> This is when just CPU is used.  If also network is used,
> the wakeups can be much rarer and they still ruin the use-time
> even worse.  I'm not completely sure of these numbers, but
> if your WLAN accesspoint power management is working, I think
> even <5 minute interval wakeups are bad, with phone networks,
> the network access intervals need to be much longer for device
> to be able to save power.
>
> These kind of wakeup frequencies you don't notice with top, you
> need either strace the programs or use e.g. nethogs[3] utility.
>
> Note also that the weaker the network signal strength is,
> the more power is required.
>
> [1] A week with a full, *new* battery [2],  no services installed etc.
>
> [2] Battery capacity worsens with time, with use and higher temperatures
>     (check the manufacturing date when buying batteries!), see:
>     https://bugs.maemo.org/show_bug.cgi?id=7636#c16
>
> [3] http://packages.debian.org/squeeze/nethogs
>
>
>> then you'll be certain your  hardware is faulty.
>
>
>     - Eero
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>


-- 

---
VRANCKX  Patrick   Patrick.Vranckx at uclouvain.be
Responsable des Infrastructures de production du système d'information (LS/SGSI/SIPR)
Responsable des Infrastructures des réseaux du système d'information (LS/SGSI/SRI)
Universite Catholique de Louvain - UCL +32 10 47 38 70