6.x acpi powerbutton
nate at root.org
Fri Apr 17 19:27:36 UTC 2009
Ian Smith wrote:
> On Fri, 10 Apr 2009, Nate Lawson wrote:
> > Andriy Gapon wrote:
> > > on 09/04/2009 23:24 Stephen Clark said the following:
> > >> Is there a reason it doesn't send and event like Linux that can be acted
> > >> upon by user space other
> > >> than signaling init? I like to have a message written in
> > >> /var/log/messages that someone pressed
> > >> the powerbutton.
> > >
> > > I think that for all suspend states except S5 userland is notified via
> > > devd mechanism and potentially can veto the suspend. S5 (soft-off) is
> > > coded to start shutdown immediately. You can try to hack on
> > > acpi_ReqSleepState in sys/dev/acpica/acpi.c.
> > >
> > > I am not sure what is the reason for this special behavior of S5. But I
> > > like it, because it sometimes allows me to perform semi-clean shutdown
> > > when X goes crazy. But I also see when it could be useful to have S5
> > > request go through userland. So this could be configurable.
> > The reason for userland getting into the loop in the first place was to
> > run programs to shut down devices and reinit them after resume. This
> > isn't necessary in the shutdown case because init already sends a
> > signal, as you mention.
> > There's already a mechanism for timing out if userland is not
> > responding, so a suspend will ultimately happen whether or not it
> > answers. However, that waits for a while (1 minute?) and devd used to be
> > optional, so I thought it best to keep the existing S5 behavior
> > (immediate shutdown).
> > It may be ok to enable this for S5 but I don't think it's very useful.
> Perhaps a silly question, but is it too late at this stage of the game
> to try logging S5 events to syslog before dying? I agree with Stephen,
> logging 'shutdown by powerbutton' surely beats what might otherwise
> resemble a spontaneous reboot? Or is something already logged here?
I'm not resisting this, but I'm having trouble seeing the importance.
What happens differently than if someone hits CTRL-ALT-DEL on a virtual
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