I have fixed this by changing my xorg.conf file from this:
Section "Device"
Identifier "Default Device"
Option "NoLogo" "True"
EndSection
to this:
Section "Device"
Identifier "Default Device"
Option "NoLogo" "True"
EndSection
Section "Screen"
Identifier "Default Screen"
Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-power-manager in Ubuntu.
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.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/762670/+subscriptions
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