linux-kernel - Re: Hibernation considerations

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Message-ID: <87wswyelyh.fsf@jbms.ath.cx>
Date:	Tue, 17 Jul 2007 17:53:26 -0400
From:	Jeremy Maitin-Shepard <jbms@....edu>
To:	david@...g.hm
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Huang\, Ying" <ying.huang@...el.com>,
	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

david@...g.hm writes:

[snip]
 
>> There are NO ACPI LIMITS!  There only are things that you need to implement
>> if you're going to support ACPI, but they need not be used ALWAYS, no?

> yes there are limits. the fact that you can't remove the battery in S4 mode
> without messing things up is a limit,

You won't mess things up as long as the resuming kernel knows that it
should resume as if the system were shutdown, rather than sent to S4
state.  Maybe it is even possible to detect what type of resuming is
needed automatically.  Similarly, booting another OS shouldn't be a
problem, except that if you do it without powering off the system first,
some devices might not work under the other OS if the other OS doesn't
initialize them properly.

[snip]

-- 
Jeremy Maitin-Shepard
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