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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/762670 Title: Laptop brightness on Dell XPS not controllable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/762670/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
