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

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Message-ID: <4E41197D.30209@ioda-net.ch>
Date:	Tue, 09 Aug 2011 13:26:53 +0200
From:	Bruno Friedmann <bruno@...a-net.ch>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, Ingo Molnar <mingo@...e.hu>,
	Mel Gorman <mgorman@...e.de>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Add reboot quirk for Dell Precision M4600

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.


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Bruno Friedmann
Ioda-Net Sàrl www.ioda-net.ch

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