linux-kernel - Re: [linux-pm] [PATCH -mm] kexec jump -v9

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Date:	Thu, 20 Mar 2008 11:40:19 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Alan Stern <stern@...land.harvard.edu>, nigel@...el.suspend2.net,
	Kexec Mailing List <kexec@...ts.infradead.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [linux-pm] [PATCH -mm] kexec jump -v9

On Tue 2008-03-18 21:25:27, Eric W. Biederman wrote:
> Alan Stern <stern@...land.harvard.edu> writes:
> 
> > On Wed, 19 Mar 2008, Rafael J. Wysocki wrote:
> >
> >> Well, I've been saying that for I-don't-remember-how-long: on my box, if you
> >> use S5 instead of entering S4, the fan doesn't work correctly after the
> >> resume.  Plain and simple.
> >> 
> >> Perhaps there's a problem with our ACPI drivers that causes this to happen,
> >> but I have no idea what that can be at the moment.
> >
> > IMO it would be worthwhile to track this down.  It's a clear indication 
> > that something is wrong somewhere.
> >
> > Could it be connected with the way the boot kernel hands control over
> > to the image kernel?  Presumably ACPI isn't prepared to deal with that
> > sort of thing during a boot from S5.  It would have to be fooled into
> > thinking the two kernels were one and the same.
> 
> It should be easy to test if it is a hand over problem, by turning off
> the laptop by placing it in S5 (shutdown -h now) and then booting same
> kernel again.

Feel free to help with testing.

I believe ACPI is simply getting confused by us overwriting memory
with that from old image. I don't see how you can emulate it with
shutdown.
									Pavel
-- 
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