Comment 35 for bug 728923

I have the same problem. Ubuntu 11.04 64bit, clean installed, fully updated. Linux media 2.6.38-11-generic #48-Ubuntu SMP Fri Jul 29 19:02:55 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux . I have configured auto-login at unity on boot.

Some times (not always but quite frequently) upon bootup, screen flickers in a rate once in about 10sec, while screen contents are partially rendered with various artifacts and distortions. Mouse and keyboard have very slow or no responsiveness.

Pressing ctrl+alt+F1 repeatedly until I manage to get to the text console, and then loggin in and runnig sudo /etc/init.d/gdm restart solves the problem.

My VGA is 01:00.0 VGA compatible controller: ATI Technologies Inc RV710 [Radeon HD 4350] and X use the opensource RADEON driver.