On Thu, 27 Apr 2006, Patrick Mochel wrote:

> > According to David this shouldn't matter.  During swsusp the system is
> > supposed to be completely off, with no suspend power available.  Hence all
> > the power sessions are guaranteed to be interrupted, and the boot kernel
> > doesn't have to worry about destroying any of them.
> 
> Not necessarily. x86 hardware implementations of suspend-to-disk retain some 
> power during suspend. Not many (if any) devices will retain context, but the
> system is definitely not completely "off". Actually, the same is true for
> soft-off on x86 (aka ACPI S5). Some power may be drawn to support various 
> power
> on events. The only time a system is truly off is when it is unplugged from
> the wall (and/or the battery taken out, if applicable). 
> 
> I don't think it matters much in this particular context, but it's important
> to keep in mind when making assumptions about "off-ness".

I'm perfectly happy to let you duke this out with David!  :-)

Either way, there is one important observation: You can't use swsusp if 
your root filesystem is on a USB disk.  Not until some sort of persistent 
storage manager is available...

Alan Stern



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