http://askubuntu.com/questions/36930/is-a-nvidia-geforce-with-optimus-technology-supported-by-ubuntu
http://askubuntu.com/questions/457446/ubuntu-14-04-nvidia-prime-is-it-supported-no?rq=1
https://wiki.ubuntu.com/Bumblebee
sudo apt-get install bumblebee bumblebee-nvidia primus nvidia-331
Usage