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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

Status in The Dell Project:
  Confirmed
Status in HWE Next Project:
  New
Status in Accelerated Xorg driver for nVidia cards:
  Confirmed
Status in OEM Priority Project:
  New
Status in X.Org X server:
  Confirmed
Status in “nvidia-graphics-drivers-331” package in Ubuntu:
  Confirmed
Status in “nvidia-graphics-drivers-331-updates” package in Ubuntu:
  Confirmed
Status in “xorg” package in Ubuntu:
  New
Status in “xserver-xorg-video-nouveau” package in Ubuntu:
  Confirmed

Bug description:
  Also affects nvidia-graphics-drivers-319

  The effect is identical to https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/958279
  but with Nvidia instead of AMD/ATI drivers.

  HW is Dell Precision M4800 with GK106GLM [Quadro K2100M] and QHD+
  display

  Once the display shuts off, it will not be woken up anymore and the screen stays dark.
  Only a restart of the Xserver will bring back the display at that point.

  A cycle of
  xset dpms force off; sleep 30; xset dpms force on
  will leave the display dark.

  At the moment I help myself by not allowing DPMS to switch off the display:
  neuffer@charion:~$ xset dpms 0 0 0

  neuffer@charion:~$ xset -q -d :0.0
  Keyboard Control:
    auto repeat:  on    key click percent:  0    LED mask:  00000000
    XKB indicators:
      00: Caps Lock:   off    01: Num Lock:    off    02: Scroll Lock: off
      03: Compose:     off    04: Kana:        off    05: Sleep:       off
      06: Suspend:     off    07: Mute:        off    08: Misc:        off
      09: Mail:        off    10: Charging:    off    11: Shift Lock:  off
      12: Group 2:     off    13: Mouse Keys:  off
    auto repeat delay:  500    repeat rate:  20
    auto repeating keys:  00ffffffdffffbbf
                          fadfffefffedffff
                          9fffffffffffffff
                          fff7ffffffffffff
    bell percent:  50    bell pitch:  400    bell duration:  100
  Pointer Control:
    acceleration:  2/1    threshold:  4
  Screen Saver:
    prefer blanking:  yes    allow exposures:  yes
    timeout:  0    cycle:  0
  Colors:
    default colormap:  0x20    BlackPixel:  0x0    WhitePixel:  0xffffff
  Font Path:
    /usr/share/fonts/X11/misc,/usr/share/fonts/X11/100dpi/:unscaled,/usr/share/fonts/X11/Type1,/usr/share/fonts/X11/100dpi,built-ins
  DPMS (Energy Star):
    Standby: 0    Suspend: 0    Off: 0
    DPMS is Enabled
    Monitor is On

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: nvidia-331 331.20-0ubuntu9
  ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.1-0ubuntu1
  Architecture: amd64
  Date: Sat Jan 11 12:06:30 2014
  InstallationDate: Installed on 2014-01-07 (3 days ago)
  InstallationMedia: Xubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016)
  SourcePackage: nvidia-graphics-drivers-331
  UpgradeStatus: No upgrade log present (probably fresh install)

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