Comment 16 for bug 1720438

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Daniel van Vugt (vanvugt) wrote :

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.