Can you try adding this line:
Option "RegistryDwords" "EnableBrightnessControl=1"
to your /etc/X11/xorg.conf at the bottom of the device section?
** Changed in: nvidia-graphics-drivers-180 (Ubuntu)
Status: Triaged => Incomplete
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no backlight support for laptop (hal depreciation regression)
https://bugs.launchpad.net/bugs/385723
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