Blender not recognizing GPU I am using blender 2.66.1 and I have a gtx 580 installed. I am using Zorin OS 7, which is based on Ubuntu 13.04. I am in the blender preferences and for 'Compute Device' I only have the CPU. Whats wrong here?
Okay. It seems the problem was not blender related. JUst run these lines of code and restart and update to the newest driver and you should be good.

sudo apt-add-repository ppa:xorg-edgers/ppa

sudo apt-get update

sudo apt-get install nvidia-current nvidia-settings