linux-kernel - Re: A minimally power-aware driver treats all messages as SUSPEND?

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Date:	Wed, 2 Jul 2008 02:08:57 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Uwe Kleine-König <Uwe.Kleine-Koenig@...i.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Andrew Morton <akpm@...l.org>,
	David Brownell <dbrownell@...rs.sourceforge.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: A minimally power-aware driver treats all messages as SUSPEND?

On Tue, Jul 01, 2008 at 05:14:15PM +0200, Uwe Kleine-König wrote:

> With that I might have to do less on SUSPEND because some state might be
> preserved after the machine comes up again.

The only hardware state guaranteed by ACPI is the contents of RAM. It's 
valid for the platform to cut the power rails to everything else, so 
from a driver point of view it's almost always equivalent to 
hibernation.

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