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

From: Ryan Pavlik abiryan at ryand.net
Date: Thu May 1 12:33:25 EEST 2008
Glad to hear you worked it out - good to know those items in any case.  
I suppose the next step would be to file a bug with those projects, 
possibly with an strace (I think?) result to find out what they're doing 
when not being used.

I have not yet had the same good luck as you and get about 1-2 days even 
if I turn the thing to offline mode when I don't want to use the 
internet.  I'm suspecting the continually breaking email (it must not 
like my imap server or something) might be affecting it, since I already 
removed the fm radio and load meter bits.

RE: battery estimates, I remember reading not too long ago on some 
really clever analysis of battery discharges in some GNOME software, 
possibly Gnome Power Manager?  It might be useful/interesting to see if 
that logic can be ported, because from at least a theoretical math point 
of view it seemed pretty sensible.


Giacomo Tufano wrote:
> Battery problem has been solved. I had 1 critical issue and 2 minimal
> ones on battery life.
> First  and worst was pidgin. The software is very aggressive when the
> net goes down. RTComm beta is more 'quiet'. I use it ever 'on'
> autoconnecting when network is up. Pidgin, apparently, don't like this
> approach.
> Gnotifier also seems to be a battery eater, much less than pidgin.
> Last problem in my home network. I have 2 apple ap in a wds network
> (concrete building). If the tablet is left in the middle between the
> two ap, this seems to hamper battery life. No special ideas on the
> why. Just noticed it.
> I'm now happy again, with ca. 4 days standby with moderate use. I was
> just willing to share my findings in case someone else is hit, many
> thanks for your support in debug this.
> Tx, gt
> ps: the last strange thing is that the battery applet says: '8 days',
> goes down one day per day up to 4 and, then, the day after is empty.
> Not a big problem, in reality. Battery indicators are, in my
> experience, not more reliable in other cases (phones or notebook).
> On 4/21/08, Giacomo Tufano <gt at iltofa.it> 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).
>>>  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...
>> 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...
>> Thank you all for your help and support,
>> gt
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Ryan Pavlik

#282  +  (442) -  [X]
A programmer started to cuss
Because getting to sleep was a fuss
As he lay there in bed
Looping 'round in his head
was: while(!asleep()) sheep++;

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