show OSD when keyboard backlight changed through hardware
Show the brightness OSD when upower signals that the keyboard backlight changed through hardware, eg a firmware-handled shortcut (often Fn+Space to cycle brightness levels), for which so far no OSD was shown.
This is a blind fix as I don't have any device with such a shortcut; can someone who does please test this? @nicolasfella
FIXED-IN: 6.0