[qtmoko] flight mode power consumption / turning gsm back on
neilb at suse.de
Tue Aug 28 14:55:54 CEST 2012
On Tue, 28 Aug 2012 08:21:20 -0400 Benjamin Deering
<ben_deering at swissmail.org> wrote:
> On 08/28/2012 07:44 AM, robin wrote:
> > hi ben,
> > could you please give some more detail on how do you set it in woods mode?
> > and does the gsm power on afterwards correctly or do you have to restart the
> > phone?
> > thanks
> > robin
> > ps: here is the link to the paper on powerconsumption of the freerunner:
> > http://www.ssrg.nicta.com.au/publications/papers/Carroll_Heiser_10.pdf
> > _______________________________________________
> > Openmoko community mailing list
> > community at lists.openmoko.org
> > http://lists.openmoko.org/mailman/listinfo/community
> I use SHR most of the time, but the same thing should apply. I just
> meant to change the GUI to call 'airplane mode' 'woods mode' because my
> phones go in the woods and I don't fly very much at all. I suspect
> something is wrong with airplane mode on both qtmoko and SHR for gta04
> if airplane mode doesn't use less power. Transmitting would be the
> biggest power draw and even if the modem remained powered up power
> consumption should drop unless it is transmitting.
> On gta02, I could turn 'airplane mode' off and on and it usually
> worked. I never spent a lot of time watching power consumption on
> gta02, but I did keep track of battery life. On gta04, we are still
> figuring out power management and I had some charging issues so I was
> dumping 'current_now' once a second in various configurations. A
> somewhat unrelated thing I noticed and should report is that the 'idle
> dim' state of fsodeviced actually uses more power. The process of
> smoothly dimming the display wakes up the CPU and by the time it settles
> back down, it is time to turn off the display anyway.
> I didn't mean to steer this away from qtmoko, but I think most of the
> power related issues we are seeing are happening at a low level and
> apply to all distros.
On a GTA02 you power off the GSM chip by writing
AT at POFF
to the modem. This definitely reduces power usage quite a lot.
You then typically write '0' to the 'power_on' and 'reset' sysfs files,
but that isn't so important I think.
If you are using gsm0710muxd, it will do all that for you when you tell it to.
You need to use some D-Bus command that I'm not familiar with.
bus-send --system --print-reply --type=method_call \
--dest=org.pyneo.muxer /org/pyneo/Muxer \
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