[Bug 370773] Re: [945GM] wierd behavior of brightness control, especially with Jaunty

Geir Ove Myhr gomyhr at gmail.com
Sat May 2 15:01:14 UTC 2009


** Description changed:

  Binary package hint: xserver-xorg-video-intel
  
  This resembles Bug #312518, Bug #367309 and Bug #356510, but there is some significant difference, so I decided to file new one. I have a similar problem with flickering screen on Jaunty with my Lenovo 3000 c200 (intel 945GM). It has nothing to do with logging in. It just flickers occasionally from time to time. I think most of the times this happens right after the machine is idle for some time - moving the mouse a bit makes it flicker for a moment until it gets stable. Yet this also happens unpredictably during use.
  When flickering, screen does not get completely black, but rather gets to the minimum brightness for a short moment and then back to the adjusted level.
  
  When using Power Manager Brightness Applet to adjust brightness,
  dragging is extremely slow and accompanied by massive flickering. When
  using  "Set Display Brightness" in Power Manager Preferences, dragging
  is normal, but yet screen flickers rapidly. In both cases adjustment
  works. If trying to adjust with keyboard shortcuts (Fn key+F10 or F11),
  screen gets dimmed and flickers, and I can only adjust one step before
  it falls back to minimum brightness, so brightness cannot be adjusted.
  There is also reproducable flickering when launching Power Manager
  Preferences. Turning off "Dim display when idle" doesn't make things
  better.
  
  Previously I was using Hardy, and this problem wasn't there, not with
  the default kernel nor with custom-compiled 2.6.29. I believe this could
  be connected to another problem which I did have on Hardy and which
  remains on Jaunty: when switching video modes, brightness falls to
  minimum, for example when logging out or switching to virtual terminal
  by pressing ctrl-alt-f2 (also sometimes when playing a video file or 3D
  game). Strangely right after installing Hardy it was ok, the problems
  only started after updating bios to the most recent version. Reverting
  bios had no effect, so I decided to stick with the most recent version.
  
  When trying the proposed solution (Bug #367309):
  
  xrandr --output LVDS --set BACKLIGHT_CONTROL combination
  
  it actually gets better: the hotkeys work again and using the gnome
  applet is faster (though a bit slow yet). Also switching between video
  modes doesn't reset brightness anymore. Though now changing brightness
  gets accomponied by clicking sound, coming probably from my hard disk. I
  looked into System Log Viewer and I noticed that every little change in
  brightness, be it via applet, hotkey or Power Management Preferences,
  triggers this message in auth.log:
  
  <username> dbus-daemon: Rejected send message, 1 matched rules;
  type="method_call", sender=":1.42" (uid=1000 pid=3586 comm="/usr/lib
  /indicator-applet/indicator-applet --oaf-a")
  interface="org.freedesktop.DBus.Properties" member="Get" error
  name="(unset)" requested_reply=0 destination=":1.140" (uid=111 pid=6568
  comm="/usr/lib/policykit/polkit-read-auth-helper 1000 "))
  
  
  In addition, after the initial command to xrandr I am able to switch back to 
  
  xrandr --output LVDS --set BACKLIGHT_CONTROL kernel
  
  without any consequences, everything behaves the same way, the
  flickering doesn't occur again (until logout). Actually after initial
  switching to any type of BACKLIGHT_CONTROL but "kernel", it doesn't
  matter at all which type I select next: nothing appears to change.
  
  I'm using Ubuntu 9.04
  xserver-xorg-video-intel: 2:2.6.3-0ubuntu9
+ 
+ [lspci]
+ 00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
+ 	Subsystem: Lenovo Device [17aa:3800]
+ 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
+ 	Subsystem: Lenovo Device [17aa:3801]

** Tags removed: needs-lspci-vvnn

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Incomplete => Confirmed

-- 
[945GM] wierd behavior of brightness control, especially with Jaunty
https://bugs.launchpad.net/bugs/370773
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