Waking XO-1.75 with RTC
quozl at laptop.org
Mon Jul 16 08:07:12 EDT 2012
On Mon, Jul 16, 2012 at 06:34:30AM -0400, Paul Fox wrote:
> james wrote:
> > George Hunt wrote (on power at lists.laptop.org):
> > > Does anyone have experience waking up an XO via the RTC? Manual
> > > entries for rtcwake make it sound pretty easy. But there's no real
> > > substitute for experience.
> > rtcwake with a delta time works for me on XO-1.75, you can see a
> > rather technical example in /runin/runin-sus, but it boils down to
> > sudo rtcwake --seconds 60 --mode mem
> > I'm not sure if it works with an absolute time ... I doubt it, but
> > I've not had a moment to try it. We don't have a need for absolute
> > time wakeup in the OLPC OS builds.
> i'm not sure i've tried an absolute wakeup time either, but i know
> of no reason it shouldn't just work.
the reason i suspect it won't do what is desired is that the internal
RTC is not set, and holds a time since boot instead of anything close
to wall clock time.
i guess it may work fine if the absolute wakeup time is specified in
time since boot.
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