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I'm having a laptop with nvidia 520mx graphics card with nvidia optimus technology running Ubuntu 14.04. I've installed nvidia graphics driver version 331.38 and nvidia-prime. What I want to do is to switch the Intel graphics card with Nvidia. Running Nvidia X server setting is not showing me any option to switch between two graphics card. Below images show which driver I'm using and what am I missing.

Nvidia Driver that are available

enter image description here

Why the option to change graphics card is not present in Nvidia X server setting in my case ? Any help is appreciated.

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