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 at srcf.ucam.org
