linux-kernel - Re: [PATCH 15/15] Revert "x86: default to reboot via ACPI"

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Message-ID: <20081106232419.GA8007@srcf.ucam.org>
Date:	Thu, 6 Nov 2008 23:24:19 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Andrey Borzenkov <arvidjaar@...l.ru>, Ingo Molnar <mingo@...e.hu>,
	Eduardo Habkost <ehabkost@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...l.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, kexec@...ts.infradead.org,
	kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 15/15] Revert "x86: default to reboot via ACPI"

On Thu, Nov 06, 2008 at 05:17:25PM -0500, Len Brown wrote:
> > Does Windows default to using the ACPI method now?
> 
> That is my guess, based on the fact that we've seen
> newer machines that don't reboot w/o using the ACPI reset reg.

We've seen machines that won't reboot for a variety of reasons in the 
past. In some cases this has seemed to be due to hardware being in a 
state that the BIOS didn't expect. Hitting the SMI trap behind the ACPI 
register might work around this, but I suspect that in many cases we 
could achieve the same effect by spending more time trying to work out 
whether there's any common themes in the failures.

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