Like, #509273 this is probably also a kernel drm bug. In fact it's probably a permutation on the earlier issue that the quirk isn't accounting for.
** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu) -- frozen screen when starting unplugged from power cord with ATI graphics https://bugs.launchpad.net/bugs/561994 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