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    SubjectRe: [PATCH 15/15] Revert "x86: default to reboot via ACPI"
    On Sun, Nov 09, 2008 at 12:11:03PM +0200, Avi Kivity wrote:
    > Matthew Garrett wrote:
    > >Hmm. But we're seeing some machines that end up very confused if
    > >rebooted via ACPI. I guess we need to run Vista on them to find out how
    > >they behave. What OSI strings did your KVM setup expose? We know that
    > >Windows changes behaviour under various circumstances depending on which
    > >OS the firmware requests, so it's almost possible that this is another
    > >of those cases.
    > >
    >
    > Isn't it the other way around? The firmware changes behavior depending
    > on how the OS identifies itself?

    That also happens, yes.

    > Reboot is a fixed feature IIRC, so it cannot change depending on
    > identification strings.

    The ID strings that the firmware requests give a good idea about which
    operating systems the machine has been tested with. If Vista uses the
    ACPI method then having the firmware request the OSI string for Vista
    gives us a good indication that it's safe to use the ACPI method.

    --
    Matthew Garrett | mjg59@srcf.ucam.org


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