linux-kernel - Re: Hibernation considerations

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Message-ID: <20070718111016.GA18716@srcf.ucam.org>
Date:	Wed, 18 Jul 2007 12:10:17 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	david@...g.hm
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jim Crilly <jim@....dont.jablowme.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	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 Tue, Jul 17, 2007 at 08:54:24PM -0700, david@...g.hm wrote:
> On Wed, 18 Jul 2007, Matthew Garrett wrote:
> 
> >On Tue, Jul 17, 2007 at 08:19:32AM -0700, david@...g.hm wrote:
> >>On Tue, 17 Jul 2007, Matthew Garrett wrote:
> >>>Powering off rather than using S4 means you lose most wakeup device
> >>>support. That would be a functional regression compared to the current
> >>>code.
> >>
> >>only if the kexec isn't able to initialize those devices.
> >
> >If you aren't using ACPI, you probably don't know how to.
> 
> the current kexec patch to allow you to move back to the original kernel 
> requires ACPI be disabled to work.

Which means it isn't putting the hardware into S4, which means that you 
don't get the platform wakeup events.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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