At least on my case I was blacklisting quite a few kernel modules on my guest of things I didn't want supported to save some memory, in the end it resulted that one of the modules (evdev I believe, I'll check it out for sure as soon as I have access to the machines, but I'm almost sure it was that one) was needed for acpi power button to be routed to the guest's acpid.
Philipp, can you try to see if loading evdev (maybe you need to restart acpid or something, I'd rather reboot to be sure) makes a difference here and button starts working? Regards... -- Manty/BestiaTester -> http://manty.net -- To UNSUBSCRIBE, email to debian-kernel-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110409174633.ga11...@vip.manty.net