[linux-pm] Re: [RFC][PATCH] swsusp: warn about USB devices in documentation

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On Mon, 20 Feb 2006, Pavel Machek wrote:

> > Can you update the patch to fix this paragraph?
> 
> Well, this is talking about suspend-to-disk... That is expected to
> power down machine, without providing USB bus power. If box
> suspends-to-disk and leaves USB up, something is wrong with the
> machine.

Oh, sorry, I didn't realize that.

Isn't there an ACPI mode that powers down most things (including RAM) but
is able to respond to wakeup events?  I can't remember the mode's name,
except that it's almost certainly "S" followed by some meaningless number
followed by some unhelpful word. :-)  Since USB plug/unplug is potentially
a wakeup event, such a mode must provide suspend power to the USB
controller.

Does swsusp still support these not-completely-powered-off modes?

On Mon, 20 Feb 2006, Rafael J. Wysocki wrote:

> Still the filesystems will in fact be mounted but inaccessible.  Perhaps we
> should replace "they won't be mounted after resume" with
> "they won't be accessible after resume".  Would that be right Alan?

Yes, it would be a lot better.

Alan Stern


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