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Screen / Graphics lag on ubuntu 12.10 on alienware M14x r2

I'm new to ubuntu so please forgive my ignorance. I recently bought an alienware M14x R2 with a '1GB GDDR5 NVIDIA® GeForce® GT 650M' vide card. I followed this tutorial to installed Ubuntu 12.10 ...
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Alienware m14x r2 Drivers?

So I just bought a brand new Alienware M14xR2 and I love the thing to death. I decided to install Ubuntu 12.10 64bit on it and I was surprised how smoothly the install went, but when I went to check ...
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How do I install drivers on an Alienware m11x?

I installed Ubuntu 12.04 on my alienware m11x, which has both integrated and discrete graphics. I also installed gnome-shell, but upon login it defaults to fallback mode. I'm pretty sure this is an ...