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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.

** Affects: xserver-xorg-video-ati (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment xenial
-- 
screen cannot be turned back on after being switched off after some time of 
inactivity
https://bugs.launchpad.net/bugs/1577170
You received this bug notification because you are a member of Ubuntu-X, which 
is subscribed to xserver-xorg-video-ati in Ubuntu.

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