linux-kernel - Re: Hibernation considerations

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Message-ID: <Pine.LNX.4.44L0.0707151914450.28934-100000@netrider.rowland.org>
Date:	Sun, 15 Jul 2007 19:15:47 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	david@...g.hm
cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang, Ying" <ying.huang@...el.com>,
	Jeremy Maitin-Shepard <jbms@....edu>,
	Kyle Moffett <mrmacman_g4@....com>,
	Nigel Cunningham <nigel@...el.suspend2.net>,
	Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Al Boldi <a1426z@...ab.com>
Subject: Re: Hibernation considerations

On Sun, 15 Jul 2007 david@...g.hm wrote:

> >> for a pure hibernate mode, you will be powering off the box after saving
> >> the suspend image. why are there any special ACPI modes involved?
> >
> > Because, for example, on my machine the status of power supply (present
> > vs not present) is not updated correctly after the restore if ACPI callbacks
> > aren't used during the hibernation.  That's just experience and it's in line
> > with the ACPI spec.
> 
> so if a machine is actually powered off the /dev/suspend process won't 
> work?
> 
> remember that the system may run a different OS between the hibernate and 
> the resume, makeing any assumptions about what state the hardware is in 
> when you start the resume is a problem.

As I understand it, running a different OS between the hibernate and 
the resume would violate the ACPI spec.

Alan Stern

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