Comment 2 for bug 9778

The only I can think of that could be related was that I installed the
lm-sensors package.
There seem to be a few people with related problems on the forums:
http://www.ubuntuforums.org/showthread.php?p=9253

lsmod, dmesg, and lspci look OK to my (somewhat newbie) eyes.

What other info do you need?