Yet another update. It turns out that compositing proved not to be the culprit; things got bad faster if compositing was on, but eventually it happens anyway even if compositing was off. I was teaching recently and the display on my laptop was fine, but the display that the class saw was weaving in a slow samba dance. A bit embarassing. Had to reboot to fix it.
I now think the real culprit is kernel mode setting. I added a file /etc/modprobe.d/radeon.conf with the following line: options radeon modeset=0 Since I added this, I have not seen wiggling displays. It is back to being a bit more like my previous experiences: I frequently have to restart X if I want the monitor to be recognized at its highest resolution. However, at least the display itself works, and the machine is more stable than with KMS on. -- Modesetting fails if large screen monitor attached at boot https://bugs.launchpad.net/bugs/570011 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
