I had just recently done a clean install of Ubuntu-Mate 15.04 and after loading the Nvidia driver, again saw this issue. Following the below instructions seems to have completely fixed it for me. I had previously tried many other suggestions/recommendations with minimal to no success. (I have a Lenovo W510 Laptop)
<--- I was able to get my brightness keys working on my Lenovo W530 on Ubuntu 12.04. These days X automatically configures itself, so creating an xorg.conf file might make your system inflexible. Instead you can add a section to a file in /usr/share/X11/xorg.conf.d/ and X will include that section in the configuration that it automatically generates. So to get the screen brightness keys working with your Nvidia graphics card, create a file in the xorg.conf.d directory, e.g: sudo gedit /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf Paste the following into the file: Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "Quadro K1000M" Option "RegistryDwords" "EnableBrightnessControl=1" EndSection Log out and log back in, or reboot, and your brightness keys should now work! ---> These instructions were found here: https://askubuntu.com/questions/76081/brightness-not-working-after- installing-nvidia-driver -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/562005 Title: Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer function while using proprietary drivers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-certification/+bug/562005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs