Wasted Graphics Card?

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http://askubuntu.com – I have a sony VAIO with the NVIDIA GT 1GB 640M LE. It's an optimus card, there's a button on above the keyboard that switches between using the NVIDIA card, or just Intel HD 4000 graphics to save power. I've tried unsuccesfully several times to install the NVIDIA driver instead of the native one that comes with Ubuntu, but I kept getting errors so removed it. Under system details, my graphics card is listed as "unknown". My question simply put is, how do I know if I'm using the 1GB VRAM card at all, or just the Intel HD4 000? If it is just the Intel, is there a way to change it so I can use t (HowTos)