linux-kernel - Re: [PATCH] preserve correct battery state through suspend/resume cycles

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Date:	Tue, 10 Oct 2006 14:10:45 +0200
From:	Stefan Seyfried <seife@...e.de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Pavel Machek <pavel@...e.cz>, Jiri Kosina <jikos@...os.cz>,
	linux-acpi@...el.com, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...l.org>, Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] preserve correct battery state through suspend/resume cycles

On Tue, Oct 10, 2006 at 12:52:09AM +0200, Rafael J. Wysocki wrote:
> On Sunday, 8 October 2006 20:42, Pavel Machek wrote:
 
> > > echo "platform" > /sys/power/disk
> > > echo "disk" > /sys/power/state
> > 
> > Maybe we should change the default in 2.6.20 or so?
> 
> Well, I think swsusp should work with "shutdown" just as well.  If it doesn't,
> that means there are some bugs in the ACPI code which should be fixed.
> By using "platform" as the default method we'll be hiding those bugs IMHO.

I'm not really intimately familiar with the ACPI spec, but IIRC those AML
methods executed by pm_ops->prepare and pm_ops->finish are mandatory for
suspending ACPI enabled machines. So using "platform" as a default seems
reasonable (assuming that on non-ACPI machines, pm_ops->{prepare,finish} will
be a noop anyway)
-- 
Stefan Seyfried
QA / R&D Team Mobile Devices        |              "Any ideas, John?"
SUSE LINUX Products GmbH, Nürnberg  | "Well, surrounding them's out." 
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