Hi, I now found bug 556232 which matches my problem. With applying the there mentioned "radeon.modeset=0" line in grub the problem is solved at the moment.
Cheers, Andreas -- [intrepid] System freezes when running xrandr with an external monitor plugged - Thinkpad T42 - radeon https://bugs.launchpad.net/bugs/270646 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
