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Switch between Nvidia and Intel graphics
Installing nvidia-prime can get your system to boot in low graphics mode if it's not used properly so be careful. This should be considered an "expert" feature and should only be used by those who know how to fix their system in case something goes wrong!
It's also important to note that you need to use LightDM (so this won't work for Ubuntu GNOME users by default because it uses GDM - you'll need to switch to LightDM) and the proprietary Nvidia drivers!
In Ubuntu 14.04, you can switch between the Nvidia and Intel graphics from the Nvidia Settings. Firstly, install nvidia-prime:
open terminal :
sudo apt-get purge bumblebee*
sudo apt-get install nvidia-prime
(the first command makes sure all the Bumblebee packages were purged - without this, nvidia-prime won't work)
Then simply open Nvidia Settings, select "PRIME Profiles" on the left and select the graphics card you want to use:

Note that switching between CPUs requires a logout so you can't for instance run the desktop using the Intel graphics while running a game using the Nvidia graphics under the same session. For that you can continue to use Bumblebee, but unfortunately you can't use both, so remove nvidia-prime if you want to use Bumblebee.
7.2 Prime Indicator (requires the nvidia-prime package, see 7.1)
To quickly switch between the Intel and Nvidia graphics or see which graphics card is currently in use, you can use Prime Indicator. You can install it in Ubuntu 14.04 using the following commands:
open terminal :
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install prime-indicator
文章出處:http://www.webupd8.org/2014/04/10-things-to-do-after-installing-ubuntu.html
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