linux-kernel - Re: Hibernation considerations

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Date:	Sat, 21 Jul 2007 12:17:41 +0200
From:	Pavel Machek <pavel@....cz>
To:	david@...g.hm
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"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>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	Al Boldi <a1426z@...ab.com>
Subject: Re: Hibernation considerations

Hi!

> >Part of the problem here is that ACPI already has its own terminology,
> >and you're trying to invent a new one instead of using the existing
> >one.
> >
> >I agree, it would be good to have a non-ACPI-specific hibernation mode,
> >something which would look to ACPI like a normal shutdown.  But I'm not
> >so sure this is possible.
> 
> why would it not be possible?
> 
> >You have to understand that the ACPI spec is weird and complex.  The
> >mere fact that you have written a system image to disk changes the way
> >ACPI regards the shutdown procedure.  Even though you may treat all the
> >devices and the rest of the hardware exactly the same, it's a different
> >operation as far as ACPI is concerned, with different requirements.
> >
> >Yes, it's bizarre.  Why do you think so many people have complained so
> >vehemently about ACPI for all these years?
> 
> so let's act as if ACPI doesn't exist and make a suspend-to-disk that 
> works without it and looks to ACPI like a complete power off/on cycle (but 
> looks to the user like a suspend/resume cycle)

...if you act as if ACPI does not exist, you'll loose AC/battery power
status upon resume, and maybe more, because ACPI handles that.
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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