Comment 2 for bug 713877

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Bryce Harrington (bryce) wrote :

If the issue happens before X is even loaded, then that means it's not an X bug.

It sounds like plymouth (or perhaps grub or something else in the plumbing layer) put the GPU into a bad state, and so when eventually X came up, it couldn't fire up 3D on it, thus no effects.

You might try booting earlier alphas of natty to see if you can bracket when it started.