Messages in this thread | | | Date | Tue, 9 Aug 2011 17:02:24 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86: Add reboot quirk for Dell Precision M4600 |
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* Bruno Friedmann <bruno@ioda-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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