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 Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/1577170 Title: screen cannot be turned back on after being switched off after some time of inactivity Status in unity package in Ubuntu: New Bug description: I did a fresh install of ubuntu 16.04 on my old dell computer in which there is an ati radeon X1300 graphics card. Whenever the screen turns off due to inactivity, it cannot be woken up by moving the mouse or by hitting a key. The same ubuntu 16.04 installed on a laptop with intel graphics card doesn't show this problem, so I first guessed it was related to the radeon driver. But as there is no problem waking the screen when I type "xset -display :0.0 dpms force off" in a terminal, it looks like the radeon driver is not the culprit. Oddly enough, invoking : gnome-screensaver-command -a in a terminal turns my screen off and after typing this line, the screen can be woken up by moving the mouse or by hitting a key. I'm confused. It seems not related to gnome-screensaver, but rather to the way ubuntu turns the screen off. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1577170/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

