Try using the Jupiter applet. This little "gold-nugget" app, written in Python, is intended to implement some power saving functionality under the Linux-kernel. After the installation is done, run the app (from Gnome menu) and switch 'Performance' to 'Power Saving' mode (through the flash icon that appear on the right-side of the panel). Also do this when your laptop is (un)plugged into/from power source because Jupiter automatically changes the power plan depending on whether is your PC plugged in or not.
After that, your laptop should not be so hot anymore :)

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