If your backlight is wired through Nvidia then I think you may need to
use the xbacklight interface. You can do it manually by installing:
sudo apt install xbacklight
and running xbacklight ...
If that works for you then I think the problem is that mutter/gnome-
shell isn't using/supporting/checking the X backlight interface. Only
the kernel interfaces.
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Tags added: bionic
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https://bugs.launchpad.net/bugs/1720438
Title:
brightness control broken nvidia
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