linux-kernel - Re: [PATCH] x86: Add reboot quirk for Dell Precision M4600

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Date:	Tue, 9 Aug 2011 17:02:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Bruno Friedmann <bruno@...a-net.ch>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Mel Gorman <mgorman@...e.de>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Add reboot quirk for Dell Precision M4600


* Bruno Friedmann <bruno@...a-net.ch> wrote:

> On 08/08/2011 06:40 PM, H. Peter Anvin wrote:
> > On 08/06/2011 10:30 AM, Matthew Garrett wrote:
> >> On Sat, Aug 06, 2011 at 08:56:35AM +0200, Ingo Molnar wrote:
> >>> Weird - ACPI is the default Windows method of reboot - how come it 
> >>> does not work on that box? Does Windows work around this specific 
> >>> machine (unlikely), or is our ACPI boot sequence not 100% compatible 
> >>> with the Windows method (more likely IMO)?
> >>
> >> The ACPI reboot method on these machines hits the keyboard controller 
> >> rather than PCI, which is unusual. What I suspect is that the write 
> >> triggers some SMM or EC code that's making assumptions about system 
> >> state, and we're not quite identical. Bouncing on the keyboard 
> >> controller from userspace with init=/bin/bash wedges in the same way.
> >>
> > 
> > I have a vague suspicion that Windows might have a meta-quirk for this
> > class of machines, i.e. if the ACPI reboot method, say, points at the
> > keyboard controller or points at the "PCI" reboot port then it actually
> > uses its own special-purpose routines rather than general routines.  It
> > would be extremely interesting to know if "reboot=kbd" works on these boxen.
> > 
> > 	-hpa
> > 
> 
> Test done with reboot=pci and unfortunately doesn't work.

Didn't hpa suggest reboot=kbd?

Thanks,

	Ingo
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