Starting with kernel 3.9, I get frequent messages "CPU5: Package temperature above
threshold, cpu clock throttled" followed by "CPU5: Package temperature/speed
normal" and occasionally:
kernel: mce: [Hardware Error]: Machine check events logged
mcelog[581]: Hardware event. This is not a software error.
This happens on three different Mac models, each running OS X and Fedora. They all get way
hotter, run fans much faster, running Linux than OS X. I've had one of those models
die inexplicably while it was exceptionally hot, but since it can't be booted at all
now I can't say whether there's cause-effect or it's just coincidence.
Since I'm down to just one Mac at the moment, I'm reluctant to do any further
baremetal Linux testing until I better understand what these messages mean.
https://bugzilla.redhat.com/show_bug.cgi?id=924570 ## my original bug on this from over
a year ago
https://bugzilla.redhat.com/show_bug.cgi?id=1050106 ## recent bug that has different
diagnostic info
Chris Murphy