I’m using a Jetson device with an external monitor, and the brightness keys aren’t working.
- journalctl -f gives the following error:
gsd-media-keys[2641]: Failed to set new screen percentage: GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gsd_5fpower_5fmanager_5ferror.Code1: No usable backlight could be found!
- xrandr works fine to adjust brightness from the terminal.
How can I resolve this?