Let's see ... Unkie Bill has already publicly stated that he wants to find a way to stop linux users from benifiting from ACPI (an open standard, btw)

The BIOS in question makes MULTIPLE checks to verify what OS is loaded on the system, regardless of what is returned to it via the normal channels.

When it identifies the OS as Linux based, it direct to a table that LOOKS ok, but which causes a Linux OS to have all manner of weird ACPI related issues.

Microsoft has "certified" that the ACPI implementation on this board meets the standard, which it clearly does not.

Mate, it's not paranoia when they REALLY ARE out to get you!