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[Bug 762670] Re: Laptop brightness on Dell XPS not controllable

To: desktop-packages@xxxxxxxxxxxxxxxxxxx
From: Pierre Chifflier <762670@xxxxxxxxxxxxxxxxxx>
Date: Thu, 08 Sep 2011 20:44:43 -0000
Reply-to: Bug 762670 <762670@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

I can confirm the problem on a Dell XPS l702x with 3D NVidia GT 555m

I have solved the problem here by adding the following to xorg.conf:

Option         "RegistryDwords" "EnableBrightnessControl=1"

Hope this helps,
Pierre

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https://bugs.launchpad.net/bugs/762670

Title:
  Laptop brightness on Dell XPS not controllable

Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
   ERROR: Method "GetBrightness" with signature "" on interface
  "org.freedesktop.UPower.KbdBacklight" doesn't exist

  The brightness of my laptop's screen is not changed at all when using the Fn-Keys.
  Ubuntu displays the notification area with the brightness setting displayed, it even shows that the brightness value is changed - but the actual brightness of the screen remains the same at all times!

  Laptop: Dell XPS 17, Full-HD 3D display, Nvidea graphics.

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