+Henrique Nunes da Silva
When you are playing games using the discrete video card, it becomes hotter, this is normal (because the discrete video card is working hard & the card is NOT in 'stand-by' mode). However overheating is never the intention.
Bumblebee makes it only possible to use the card, it isn't overclocking any hardware or something, so it doesn't matter if you are using Windows, Linux, Mac or....
My first guess is to clean your laptop, remove all the dust. There are special high pressure sprayers on the market for cleaning laptops/computers. Also it is possible that your laptop hardware is broken, causing overheating problems.