[hafqa] [hafqa] [Bug 2602] Battery drain low or empty overnight

[From: bugzilla-daemon at maemo.org]

https://bugs.maemo.org/show_bug.cgi?id=2602


eero.tamminen at nokia.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  BugsThisDependsOn|                            |2787




------- Comment #36 from eero.tamminen at nokia.com  2008-11-03 17:27 GMT+3 -------
(In reply to comment #35)
> (In reply to comment #34)
>> You could disable all the Home and statusbar applets that you don't need
>> (I think CPU meter statusbar applets for example read /proc/ pretty often
>> and the banner applet uses network).
> 
> The CPU meter status bar applet doesn't seem to be a problem since even if it
> is present, the battery usually last several days before a recharge is needed
> (does the CPU meter still read /proc when the tablet is locked?).

I haven't used it, but it's easy to check, just ssh to the device and strace
hildon-desktop (the process using more memory, the smaller one is
maemo-invoker).


> > The lock + press button keeping the screen undimmed could indeed be one
> > factor.
> 
> In fact, there's a bug already open about that: bug 2787.

Thanks, added as dependency.


>> Some card models use more power than others, as a rule larger cards use more. 
>> That should happen only when they're being accessed though.  You could try
>> "lsof|grep /media/" to see whether something like metalayer-crawler is
>> accessing the card.
> 
> As the battery doesn't always drain, I don't think the card is a problem
> (unless the tablet does something about it I don't know).
>
> > If the FAT file system on the memory card is corrupted (MicroSoft FAT file
> > system is so primitive that it can get easily corrupted, but it's needed for
> > compatibility reasons), it can cause processes to access it constantly, but
> > usually you should see this in "top".
> 
> If it is corrupted, I suppose I should get error messages or something in
> dmesg output.

Yes.

The card contents may also affect how long it's used, but "lsof" and "top"
should tell it though.


> > If you want Wifi off (instead of just not connected to some specific access
> > point), use the "offline" mode listed in the Power (button) menu.
> 
> This is bad design. If wifi is not used, then it should be completely turned
> off by the system (note that I don't use autoconnect). Ditto for the other
> radios (which I don't use).

Unless the device is in offline mode, applications needing network will
activate it automatically to do their updates.  There can be quite a few things
doing that in computers nowadays: IM, E-mail, RSS etc...


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