Accelerometer question [preliminary report]

Fox Mulder Quakeman1 at
Fri Oct 10 20:04:59 CEST 2008

Andy Green wrote:
> The issue is "what does idle mean".  Suspend for Freerunner should last
> a week.  Sitting there with CPU up even with backlight down is 60-90mA
> on battery, suspend is 5 - 10mA and that's why you get battery life
> reduced accordingly if you stay out of suspend.  That's a kernelspace
> issue on the one hand (suspend is not entirely reliable) but also a
> userspace issue (there have been bugs negotiating entry to suspend
> instead of sitting there with CPU up at 400MHz and backlight down).

Since suspend/resume works again i did a little test how much power my
neo uses when in suspend. :)

The starting situation was that i used debian with [1] as kernel and had
wlan+gsm activated and only zhone and openmoko-panel-plugin running.
Than i plug off the power cradle at 100% battery level, suspended my neo
and let it sleep for 6 hours. After i woke ip up it only had 24% battery
left. This means ~3/4 of the 1200mAh accu drained. 900mAh in 6 hours
means that it used 150mA in average all the time while in suspend. This
is really bad because it only needs ~100mA when idle and backlight is
off. I don't know what draws so much power that the average usage is
higher than in active idle mode.

It's nice that suspend/resume works but this little test shows that
there are still some issues left. :/


[1] testing-om-gta02-20081008.uImage.bin

More information about the community mailing list