Comment 4 for bug 371432

I can confirm, too. The driver from Debian seems to work as a workaround (no problems after two days of using the computer, watching the Youtube, using media players with xv output etc.).

By the way: did you get the bulletproof X- warning about Ubuntu being in low graphics mode, and an offer to troubleshoot X? I didn't: the gdm just tried to start, then showed a black screen, and the computer restarted after a few minutes. No warnings, no offers.