Bug#628480: linux-image-2.6.32-5-xen-amd64: System hangs after reboot command

[Markus Schade <markus.schade@gmail.com>]

Hi Ian,

sorry for answering so late.

On Wed, Jan 4, 2012 at 12:41 PM, Ian Campbell <ijc@hellion.org.uk> wrote:
> On Wed, 2012-01-04 at 11:20 +0100, Markus Schade wrote:
>> unfortunately this is bug does not apply to Debian only.  MSI has changed some
>> ACPI tables as of BIOS Version 8.7, which lead to this result.
>
> Does this also affect native kernels?

No, they work without any problems.

> if this issue is with the ACPI
> interpreter then I would expect so since this is done by the dom0 kernel
> in a Xen system too.

You would think so. But as far as I have found, it seems that Xen does
the actual reboot itself.
So somewhere in these last moments, things differ.
We have hundreds of these boards and have spent quite some time to
narrow it down to this specifc BIOS change.
When we asked MSI, they sort of admitted, that they had indeed change
ACPI related items in the 8.7 BIOS release.

>> You can either downgrade to 8.6 or boot the kernel with acpi=ht.
>> Other common workarounds like 'reboot=b' do not work.
>
> Those are hypervisor or kernel options?

Both are kernel options.

Regards,
Markus