14.04 - Has Nvidia 331.38 support for optimus?

I'm going to install Ubuntu 14.04 on my laptop with Intel & Nvidia graphics card. Do I have to install Bumblebee or Nvidia 331.38 has support for optimus. I don't use Nvidia card I would like to use only Intel card due to lower using battery. THX in advance :-)

Battery saving does work, but I didn't notice any change of performance while using nvidia on internal display. I don't have external display so, I don't know what is the outcome.

Also in graphics details, the nvidia device is detected when on performance mode.

Simple instructions what I followed,

• Open dash by tapping Super (Windows key)



• Search additional, click on Additional drivers. Following image will open up, By default Nouveau driver will be selected. Select as shown in picture.

  
  

  




• Again open dash, search nvidia, open nvidia X server settings. Choose intel card as default. Save and logout. See below picture.