Messages in this thread | | | Date | Tue, 09 Aug 2011 13:26:53 +0200 | From | Bruno Friedmann <> | 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.
--
Bruno Friedmann Ioda-Net Sàrl www.ioda-net.ch
openSUSE Member & Ambassador GPG KEY : D5C9B751C4653227 irc: tigerfoot -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |