Now i have done a aptitude update/upgrade and I've seen there is a new version of xserver-xorg-video-ati 1:6.12.191-1ubuntu2 So i wipe out xorg.conf (put on an empty one) and I have rebooted. Now everything is fine!
I think that this bug was related to #514845 ** Changed in: xserver-xorg-video-ati (Ubuntu) Status: Confirmed => Fix Released -- video problem flicker unreadable hp compaq nx9420 ati radeon https://bugs.launchpad.net/bugs/537640 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