Re: Hibernate after alarm wakes from STR

Richard Hughes
2007-07-09T08:34:11Z

On Sun, 2007-07-08 at 19:44 -0700, David Brownell wrote:
> On Sunday 08 July 2007, Marcelo Tosatti wrote:
> > On Sun, Jul 08, 2007 at 01:15:40PM -0700, David Brownell wrote:
> > > On Sunday 08 July 2007, Richard Hughes wrote:
> > >
> > > That is, we may want to provide a bit more information about the
> > > specific event which triggered wakeup. I don't believe there is
> > > such an interface, in general.
> >
> > What would be a nice interface? Perhaps an additional file under
> > /sys/devices/.../power/wakeup_fired or something (only for devices with
> > can_wakeup set).
>
> Better a /sys/power/wakeup_event (or whatever) that's more easily
> found. It could link to the device issuing the event.

Good plan.

> > > Plus, the notion seems kind of racey to me. (If you press a key
> > > right while the wakealarm fires, you don't want hibernation..)
> >
> > Then you check if the any key or other wakeup event has happened other
> > than RTC... I don't see any problem with that.
>
> It might be best not to need to re-activate the whole system from
> STR though ... it ought to be possible to just power off, having
> already written the image to disk. Right?
>
> Yes, there's all that stuff about how to quiesce the system properly,
> freezer/icebox/flamesuits/etc. Regardless, going from STR to fully
> operational and then hibernating would take time and energy that
> might not be available...

Sure, although quick-suspend on a few minutes idle, slow
hibernate-on-long idle is one of the biggest requested features of
g-p-m.

Richard.