I tried this as well; here's a snippet from my xorg.conf:
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 660M"
Option "NoLogo" "true"
Option "RegistryDwords" "EnableBrightnessControl=1"
Needless to say, that doesn't work on the ASUS G75.... Also, this issue still
persists in 12.10 as of today. Sad...
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https://bugs.launchpad.net/bugs/1046088
Title:
No Brightness Control on ASUS G75VW Notbook (304.43)
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