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I enforced KMS by specifying radeon.modeset=1. Unity does not start at all. Metacity starts but gnome-panel kills the machine, somewhere inside radeon driver. See the last messages from /var/log/syslog: http://pastebin.com/6JLUCZXq affects ubuntu ** Affects: xserver-xorg-video-ati (Ubuntu) Importance: Undecided Status: New -- radeon driver crashes (freezing the system) on 11.04 when forcing KMS on Power G5 https://bugs.launchpad.net/bugs/790433 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