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
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