screensaver and power manager dbus interfaces

[Holger Macht]

On Fri 02. Jun - 10:26:08, David Zeuthen wrote:
> On Fri, 2006-06-02 at 11:02 +0200, Alexander Larsson wrote:
> > Some systems also have a mode where they both save to disk and memory
> > at the same time, then they suspend, but if power goes low they power
> > down (and un-hibernate on startup). 
> 
> You may be referring to Windows Vista, that's the only place I've heard
> of this feature. For the record, I think this is purely done in software
> but I'm not aware of any free operating system (e.g. based on Linux,
> FreeBSD or Solaris) that does this yet. I've heard of hackers playing
> around with it getting mixed results though.

http://suspend.sourceforge.net does this already with good results.

> 
> It's a nice feature though and if done right I think the user probably
> won't even notice that it hibernates before suspending (suspend to disk
> can indeed be very fast but on Linux it's not unless you use suspend2).
> 
> > Wouldn't it make sense to support a mode like that too?
> 
> Of course it would make sense to support this feature in an OS but I
> don't think it's something that should be exposed in this interface as
> the Suspend(), Hibernate() methods are in the org.fd.PowerManager
> interface purely convenience for conduits used by the desktop
> environment. As an example, we use this in Fedora for the "Sleep" and
> "Shutdown" items in the System menu on the panel.
> 
> The only reason we have both Suspend() and Hibernate() is because the
> user experience of respectively Suspending and Hibernating is different
> and I'm not sure, if done right, that SuspendAndHibernate() would be
> vastly different from Suspend(). 
> 
> But then again... we probably know a lot better once this feature is
> available and if it makes sense we could add SuspendAndHibernate() to
> the o.fd.PowerManager interface. We could also add it regardless once
> the feature becomes available, I'm not opposed to adding it but my
> personal view is that it doesn't make sense to add something to an
> interface if it doesn't get used by anything.

Will be available as soon as kernel 2.6.17 is out.

Regards,
	Holger