Have you tried adding
Option "RegistryDwords" "EnableBrightnessControl=1"
to your /etc/X11/xorg.conf at the bottom of the device section?
** Changed in: nvidia-graphics-drivers (Ubuntu)
Status: New => Incomplete
** Changed in: nvidia-graphics-drivers (Ubuntu)
Importance: Undecided => Low
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Can not change LCD brightness on Lenovo Y450 laptop
https://bugs.launchpad.net/bugs/540112
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