That was a mistake to install nvidia drivers on a optimus enabled system.It won't work.
First you need to uninstall existing nvidia driver.
Uninstall nvidia, run following in terminal
Reinstall the Mesa package for GL:
sudo apt-get --reinstall install libgl1-mesa-glx
When done, reboot with:
To turnoff nvidia graphics card and use it only when required install The Bumblebee:
Add the Stable Bumblebee Releases PPA and install Bumblebee using the proprietary NVIDIA driver:
sudo add-apt-repository ppa:bumblebee/stable
sudo apt-get update
sudo apt-get install bumblebee bumblebee-nvidia
If you have 32-bit applications like Wine, and run 11.10 Oneiric or later, you will need extra libraries:
sudo apt-get install virtualgl-libs:i386
Allow yourself to use Bumblebee by adding yourself to the 'bumblebee' group. (replace
$USER by your username)
sudo usermod -a -G bumblebee $USER
Reboot or re-login to apply the group changes
If you'd like to run a program on the nvidia card now, use the optirun program:
optirun firefox &
To test whether it is working, install mesa-utilities by executing
sudo apt-get install mesa-utils
glxgears, wait for sometimes, you will get frame rate every 5 second and it will be like 50-60 fps. It means it is using intel card.
optirun glxgears and see the framerates. It will be much higher indicating nvidia card is working.
Also you can run webgl tests with browsers.
Read more from bumblebee wiki
How well do laptops with Nvidia Optimus work?
How well will Nvidia Optimus cards be supported in 12.04?