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

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Message-ID: <4E415E37.2060107@ioda-net.ch>
Date:	Tue, 09 Aug 2011 18:20:07 +0200
From:	Bruno Friedmann <bruno@...a-net.ch>
To:	Ingo Molnar <mingo@...e.hu>
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

On 08/09/2011 05:02 PM, Ingo Molnar wrote:
> 
> * 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

Ingo yeap and reboot=kbd doesn't work ...
I must really be awake before writing

Once the system has synchronised the harddrive, it just stay at now rebooting ...


-- 

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

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