Thanks to Alex Deucher on the xorg mailing lists I found the corresponding xorg bug and a workaround:
Bug 18397: http://bugs.freedesktop.org/show_bug.cgi?id=18397 Adding this to my xorg.conf under the "Device" section fixed it for me: Option "EXANoDownloadFromScreen" "true" ** Bug watch added: freedesktop.org Bugzilla #18397 https://bugs.freedesktop.org/show_bug.cgi?id=18397 -- Thunderbird shows graphic error after update to jaunty using radeon driver https://bugs.launchpad.net/bugs/363287 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in ubuntu. _______________________________________________ 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