Mageia 2 on Macbook Pro: how to enable brightness keys with nvidia driver

Here's how to make brightness keys (eg. F1 and F2) to work on Mageia 2 on Gnome 3.

Add this line to the Device section of the xorg.conf (after you configured the proprietary drivers under Mageia control center):

Option "RegistryDwords" "EnableBrightnessControl=1"

Here's the page that helped me.

Edit: note that this configuration may lead to X11 crashes as well as the same configuration with noveau (which does not need any Option in x.org.conf).