I have the same problem with a Radeon X1300 card and it can be fixed using the 'radeon.modeset=0' kernel option, so I guess it is related to KMS. The problem was not present in ubuntu 10.04 and started to show in 10.10. It is still present in 11.04 alpha 3.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in ubuntu. https://bugs.launchpad.net/bugs/727979 Title: Screen flicker approx. every 30 seconds _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp