On Fri, Apr 20, 2012 at 09:39:59PM +0200, Paolo Bonzini wrote:
> Il 20/04/2012 19:26, Michael Roth ha scritto:
> > Do we have a way of differentiating a guest shutting down as a result of
> > shutdown vs. suspend-to-disk? AFAIK they both have the same ending state. If
> > so I'm not sure we can say anything other than "the machine may or may not
> > resume when you start it up, depending on whether or not the suspend-to-disk
> > completed before the machine shut down".
>
> I'm not sure but I think you can differentiate S4 and S5 in the DSDT.
>
You can (not done now) but I wouldn't rely on it. Some OSes do suspend
to disk, even when bios does not report S4 support, by doing powerdown. At
least Linux and WinXP do that.
--
Gleb.
