I have the same problem. Adding radeon.new_pll=0 to the kernel command line solved the issue for me. A big thanks for this answer. I also have problems with a strange sound that come from my laptop and this problem is dissapear after I wrote radeon.new_pll=0.
My laptop: Asus F3JP ATI X1700 A big thanks for your work! Sorry, my English isn't wery well. -- [RV530] screen flickers in lucid lynx [Needs pll quirk] https://bugs.launchpad.net/bugs/543045 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