EDIT : I just found that letting the screen be turned off when not logged at all (when I boot the computer and don't log in for example) causes no problem. The screen goes black and can be woken up by moving the mouse or by hitting a key. The problem only appear when logged in, whatever the user.
** No longer affects: xserver-xorg-video-ati (Ubuntu) ** No longer affects: gnome-screensaver (Ubuntu) -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in Ubuntu. https://bugs.launchpad.net/bugs/1577170 Title: screen cannot be turned back on after being switched off after some time of inactivity To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1577170/+subscriptions _______________________________________________ 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