xfpm-power-backlight-helper(1) on Linux
The text dae573fa64bd, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it. The page shows this text now.
control the brightness from the command line
Flags it lists
-
--get-brightness -
--get-max-brightness -
--help -
--set-brightness -
-h