Macbook Pro 5,5 Brightness Control in Ubuntu

I have verified that the latest installment of Ubuntu 14.04 with the latest Nvidia proprietary drivers fixed the brightness controls

All you have to do is add
Option "RegistryDwords" "EnableBrightnessControl=1"
to /etc/X11/xorg.conf under the device section.

OR

If you do not see a valid xorg.conf, maybe something that looks like this "xorg.conf~", more than likely the new method for Xorg configurations files is being used which involves a conglomeration of "conf" files inside of the xorg.conf.d folder.  Make and add the following:

mkdir /usr/share/X11/xorg.conf.d/20-nvidia.conf

vim 20-nvidia.conf

paste the following:

Section "Device"
        Identifier "NVIDIA"
        Driver "nvidia"
        Option  "NoLogo" "True"
        Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

save it by hitting "esc" then ":wq" and finally "enter".


Reboot, then try the f1 and f2 keys.  Your brightness should be adjusting accordingly.