I left my laptop for 20 minutes, in the mean time Ubuntu decided to turn off my screen (which I expect it to do), but when I returned and powered on the screen again, it was just like an image of noise with a thick pink bar to the right side of the screen.
The noise then began to fade away as frost on a window that is heating up, before only remaining in the side, while the pink bar remained in view.
Regardless of my keystrokes, nothing happened. Going to TTY1 or 2 did not work.
So I rebooted, assuming a hiccup. But as soon as a selected Ubuntu from the boot manager, the same visual strangeness occurred.
I feared there was something wrong with my laptop screen, but Windows 7 runs without problems. I know X cannot toggle between two graphics cards, but surely it should be able to select one or something?
It's a Dell Precision M4600 and Ubuntu 11.10 using Unity (although its failure before X even is started (I assume) makes me wonder whether Unity has anything to do with it).
 I don't know what sort of hack Ubuntu uses to make the start up loading screen.