Hi,
I am using the AsusNBFnKeys.kext together with the AsusACPIBackLightPanel.kext and the dsdt patch you gave on this post.
https://osxlatitude.com/index.php?/topic/2167-display-backlight-driver-for-asus-notebooks/page-4&do=findComment&comment=40719
Im using the same hardware, Asus G73SW with GTX460m. (Running El Capitan 10.11.2)
In the logs it is complaining about :
19 Jan 2016 22:02:01 kernel[0]: AsusNBFnKeys: Cannot find the dictionary brightness
19 Jan 2016 22:02:02 kernel[0]: AsusNBFnKeys: Cannot find the dictionary brightness
19 Jan 2016 22:02:02 kernel[0]: AsusNBFnKeys: Cannot find the dictionary brightness
Is there something missing?