If brightness keys don't work by default try adding # sudo apt-get install xbacklight
then you can manually set your hot keys to raise and lower the brightness. http://linux.die.net/man/1/xbacklight
If brightness keys don't work by default try adding # sudo apt-get install xbacklight
then you can manually set your hot keys to raise and lower the brightness. http://linux.die.net/man/1/xbacklight