Most likely the source of heat is not CPU, but video card. You notebook has 2 video cards, with the idea that slow but cool HD400 works by default, switching to hot and powerful one when needed. (which one do you have by the way? They vary in this model). In Linux, this does not work out of the box, and you always have both video cards on, resulting in maximum heat.
If you are OK to go without big GPU, you can just disable bigger video card altogether. Intel HD4000 is a rather tough guy itself - it can handle HD video and all 2010 games quite well. Otherwise, search for instruction on how to tweak NVIDIA Optimus if you have NVIDIA, or PowerXPress if you have Radeon. These are the names of technologies that use 2 video cards to save power.