linux-kernel - Re: Hibernation considerations

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Message-Id: <200707160938.16037.nigel@nigel.suspend2.net>
Date:	Mon, 16 Jul 2007 09:38:13 +1000
From:	Nigel Cunningham <nigel@...el.suspend2.net>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	david@...g.hm, "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>,
	Pavel Machek <pavel@....cz>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Al Boldi <a1426z@...ab.com>
Subject: Re: Hibernation considerations

Hi.

On Monday 16 July 2007 09:15:47 Alan Stern wrote:
> 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.

Well then, I know one or two people who would argue that the ACPI spec is 
faulty. :\

Regards,

Nigel
-- 
Nigel Cunningham
Christian Reformed Church of Cobden
103 Curdie Street, Cobden 3266, Victoria, Australia
Ph. +61 3 5595 1185 / +61 417 100 574
Communal Worship: 11 am Sunday.

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