[20.03] brightnessctl: Add systemd support (backport) #80215
Merged
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Motivation for this change
Backport of #79663. IMO it makes sense to backport this since 20.03 is still in the "alpha" stage, to have a consistent behavior on 20.03 and nixos-unstable, and as I already updated the Wiki page: https://nixos.wiki/wiki/Backlight#brightnessctl. But if anyone has objections we can close this, it's completely optional (both methods work).
cc @flokli
Things done
sandbox
innix.conf
on non-NixOS linux)nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
./result/bin/
)nix path-info -S
before and after)