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For laptops which use muxless Nvidia Optimus, there's a new way to support officially on Ubuntu 12.04 LTS.
sudo apt-get install nvidia-319-updates nvidia-prime xserver-xorg-lts-raring
The command will upgrade
* kernel to 3.8 ,
* X server RandR to 1.4
* Install Nvidia driver version 319.
After reboot, it will use nvidia driver by default.
There is no need to upgrade to 13.10 if you prefer 12.04 LTS.