I've found this forum thread:
https://forums.developer.nvidia.com/t/solus-nvidia-gtx-1070-brightness-
control-not-working/54472
If I understand correctly, the OP resolved his issue by setting the
kernel boot parameter
nvidia.NVreg_EnableBacklightHandler=1
This did not solve the issue for me, however.
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https://bugs.launchpad.net/bugs/1720438
Title:
brightness control broken nvidia
Status in gnome-power:
Confirmed
Status in gnome-power-manager package in Ubuntu:
Confirmed
Status in gnome-shell package in Ubuntu:
Incomplete
Status in mutter package in Ubuntu:
Incomplete
Status in nvidia-graphics-drivers-384 package in Ubuntu:
Confirmed
Bug description:
Ubuntu 17.10 beta 2
Nvidia 310M, 340.x official driver installed with Additional Drivers program
The brightness control built into the laptop (Dell Vostro 3300) isn't
changing the brightness. Normally I can use Fn + Up/Down arrow keys to change
the brightness.
The brightness control works fine in Ubuntu 16.04 with the same driver series.
I don't know if this is a GNOME 3.26 bug but it's likely as I'm having
the exact same problem with Fedora 26 on this laptop.
To manage notifications about this bug go to:
https://bugs.launchpad.net/gnome-power/+bug/1720438/+subscriptions
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