[Bug 409037] Re: [i815] Switching to DPMS off doesn't switch laptop's LCD backlight off

[Bryce Harrington]

** Description changed:

  Binary package hint: xserver-xorg-video-intel
  
  I am unable to switch my laptop's LCD backlight off. Whenever I switch
  my monitor to DPMS off, the screen gets black but the backlight stays
  on. Though I am currently running Karmic Koala daily build from
  2009-08-03 with xorg-edgers ppa, this problem has been present since
  Ubuntu 8.04 (and possibly even before that). The difference in karmic is
  that now gnome-power-manager doesn't even blank the screen.
  
  I have enabled dpms in xorg.conf, and according to Xorg.log.0, it is
  enabled.
  
  Running these commands (after killing gnome-power-manager):
  xset -q | grep Monitor && xset dpms force off && sleep 5 && xset -q | grep Monitor && sleep 5 && xset dpms force on && xset -q | grep Monitor
  
  provides the following output:
    Monitor is On
    Monitor is Off
    Monitor is On
   
  So according xset, DPMS should be working. That it not the case. The monitor does turn black but the backlight  stays on.
  
  My laptop is a Fujitsu-Siemens LifeBook C-6637 and it has an Intel 82815
  graphics chip (i815).
  
  My xserver-xorg-video-intel version is 2.8.0+git20090804.af45482a-
  0ubuntu0sarvatt (karmic).
  
  $ lsb_release -rd
  Description:	Ubuntu karmic (development branch)
  Release:	9.10
  
  $ apt-cache policy xserver-xorg-video-intel
  xserver-xorg-video-intel:
    Asennettu: 2:2.8.0+git20090804.af45482a-0ubuntu0sarvatt
    Ehdokas: 2:2.8.0+git20090804.af45482a-0ubuntu0sarvatt
    Versiotaulukko:
   *** 2:2.8.0+git20090804.af45482a-0ubuntu0sarvatt 0
          500 http://ppa.launchpad.net karmic/main Packages
          100 /var/lib/dpkg/status
       2:2.8.0-0ubuntu1 0
          500 http://fi.archive.ubuntu.com karmic/main Packages
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation 82815 815 Chipset Host Bridge and Memory Controller Hub [8086:1130] (rev 11)
+     	Subsystem: Fujitsu Limited. Device [10cf:110b]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation 82815 Chipset Graphics Controller (CGC) [8086:1132] (rev 11)
+     	Subsystem: Fujitsu Limited. Device [10cf:110c]

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[i815] Switching to DPMS off doesn't switch laptop's LCD backlight off
https://bugs.launchpad.net/bugs/409037
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