Comment 8 for bug 743352

My /sys/class/backlight/ directory has no further items such as a mbp_backlight subfolder:

$ sudo ls -aFl /sys/class/backlight/
total 0
drwxr-xr-x 2 root root 0 2011-04-23 02:21 ./
drwxr-xr-x 49 root root 0 2011-04-23 02:21 ../
$

I tested it and the hack doesn't work for me. I modified /etc/X11/xorg.conf, rebooted, and the F1-F2 keys are still unresponsive:

$ cat /etc/X11/xorg.conf
Section "Screen"
 Identifier "Default Screen"
 DefaultDepth 24
EndSection

Section "Module"
 Load "glx"
EndSection

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