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On 2014-10-25T22:06:38+00:00 Freedesktop-7 wrote:

Created attachment 108419
Xorg.0.log

X screen blanks after timeout, but backlight remains on forever. "xset
dpms force off" has no effect. "vbetool dpms off" does turn off the
backlight. Using nvidia proprietary driver, "xset dpms force off" turns
off backlight but then has other issues (
https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-
drivers-331/+bug/1268151 )

Curiously, and possibly related, "xset s activate" (via ssh and/or using
sleep 1) has no effect. It does not blank the screen.

Possibly related, from Xorg.0.log:

    [    27.193] (II) NOUVEAU(0): No DPMS capabilities specified

version: nouveau from kernel 3.16.6-gentoo.

Reply at: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-
drivers-331/+bug/1268151/comments/24


** Changed in: xorg-server
       Status: Unknown => Confirmed

** Changed in: xorg-server
   Importance: Unknown => Low

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https://bugs.launchpad.net/bugs/1268151

Title:
  [Dell M4800] DPMS support broken, fails to wake up the monitor after
  putting it to sleep

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