Re: [PATCH] x86: Add reboot quirk for Dell Precision M4600
From: Bruno Friedmann
Date: Wed Aug 10 2011 - 08:02:05 EST
On 08/09/2011 05:02 PM, Ingo Molnar wrote:
> * Bruno Friedmann <bruno@xxxxxxxxxxx> 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.
>> Test done with reboot=pci and unfortunately doesn't work.
> Didn't hpa suggest reboot=kbd?
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 ...
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