New information : typing "xset -display :0.0 dpms force off" in the terminal makes my screen to turn off. Then I can wake it up just by moving the mouse. So the problem seems related to the "screen saver" of ubuntu rather than Xorg.
** Package changed: xorg (Ubuntu) => gnome-screensaver (Ubuntu) ** Description changed: I did a fresh install off ubuntu 16.04 on my old dell computer in which there is an ati radeon X1300 graphics card. - Whenever the screen goes off due to inactivity, it cannot be woken up + Whenever the screen goes off due to inactivity, it cannot be woken up by moving the mouse or hit a key. The same ubuntu 16.04 installed on a laptop with intel graphics card - doesn't show this problem, so I guess it is related to the radeon - driver. + 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, I think the problem + is rather related to gnome-screensaver. -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1577170/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
