The release in question is OpenBSD 4.8 with GENERIC.MP kernel. The main problem here is the acpitz device which shuts down the machine, reporting a very unusual (and innacurate) temperature: 255C/5282K.
I got around this by disabling the device, but the underlying problem still remains and I suspect it is related to acpiec which fails to load. Furthermore, as acpitz, acpibat and acpiac all rely on acpiec it stands to reason that they wouldn't work - and they don't. At least not as expected. The problem with acpitz is the most obvious, however apm also fails to get proper readings of A/C and battery state. Though, cpu frequency scaling and suspend/resume work properly and hw.sensors.cpu0.temp0 readings are correct. I tracked down the problem as far as I could but my understanding of ACPI is superficial at best so any and all help would be highly appreciated. Included is the link to a zip file containing the following: dmesg (with acpitz enabled) dmesg (with acpitz disabled) acpidump pcidump uname http://www.speedyshare.com/files/25064353/download/logs.zip
