instead of disabling KMS, you can also try FN-F7 (switching to extern/intern monitor on thinkpads). Perhaps a duplicate of Bug 650425?
-- [KMS] White Screen instead of desktop after 10.10 update (ATI Mobility Radeon 7500 card) https://bugs.launchpad.net/bugs/655099 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