Jonas Ådahl de2d19e882 gdctl: Support showing and setting output luminance
`gdctl show` now prints "monitor preferences", which currently consists
of only the luminance setting.

`gdctl prefs` is introduced, where one can run e.g. `gdctl prefs
--monitor DP-1 --luminance 80.0` to set the output luminance of the
monitor connected to DP-1 to 80%.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/4271>
2025-02-27 13:13:42 +01:00
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