Hi

Please don't forgett to load the applesmc kernel module during
start, if you want to enable your MacBook backlight keys.

Edit the file "/etc/sysconfig/kernel" and add "applesmc" to the 
line MODULES_LOADED_ON_BOOT:

MODULES_LOADED_ON_BOOT="applesmc"

After a restart, your backlight keys should work.

You can also load this module manually as root with the command:
 modprobe applesmc
to check if everything works as expected. (Have a look into the 
logfile /var/log/messages for this.)

Have a lot of fun!