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Lenovo x220 high temperature and constant fan equals poor battery life

In the past three weeks I've noticed that Fedora 17 is not performing the way it used to on my Lenovo x220. It averages temperatures of 60C and htop shows the system is inactive. In the past, normal temp was around 40C in the same conditions and the fan would barely be running, if at all.

This shortens what used to be around 9 hours of battery life to about 2 :(

Any suggestion on how to troubleshoot or resolve this problem? Booting into older kernels doesn't appear to produce better results.