Comment 4 for bug 746924

This may be a dup of #751689. Try running this good test from there and see if you get the same results:

stress -c 4 & watch -n 0.5 'cat /proc/acpi/ibm/thermal ; cat /proc/acpi/ibm/fan | egrep "(speed|level):" ; cat /proc/cpuinfo | grep MHz'

Does the frequency drop once the temperature rises?