CPU Temp Warnings

[Matthias Schojohann]

Hey all,
i have a FreeBSD10.1-RELEASE on my iBook G4 1,41GHz and every once in a
while i get an error on the terminal that says:
WARNING: Current temperature (CPU BOTTOMSIDE: 255.0 C) exceeds critical
temperature (80.0 C); count = 1

sysctl dev.adt746x.0.sensors.cpu_bottomside.temp however gives me temps
like 50.0 C so where does my system get the 255 from? Apart from the fact
that i don't want to see my CPU on that temperature, it's pretty annoying
when i have systat running on that machine.

Cheers, Matt