I have an Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (according to lspci) and get this issue just as well. The screen turns black and nothing helps except rebooting. I am using compiz. This issue did not exist under Gutsy.
Found out that I can ctrl+alt+f1 to the terminal as soon as it turns black and then trigger a reboot using ctrl+alt+del. nothing else seems to work. There have got to be more issues submitted about this... -- [hardy] Xorg freezes on 945GM to black screen with artifacts and mouse pointer, no compiz active https://bugs.launchpad.net/bugs/191281 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs