systemd-backlight@.service, systemd-backlight - Load and save the
   display backlight brightness at boot and shutdown





   systemd-backlight@.service is a service that restores the display
   backlight brightness at early boot and saves it at shutdown. On disk,
   the backlight brightness is stored in /var/lib/systemd/backlight/.
   During loading, if the udev property ID_BACKLIGHT_CLAMP is not set to
   false, the brightness is clamped to a value of at least 1 or 5% of
   maximum brightness, whichever is greater. This restriction will be
   removed when the kernel allows user space to reliably set a brightness
   value which does not turn off the display.


   systemd-backlight understands the following kernel command line

       Takes a boolean argument. Defaults to "1". If "0", does not restore
       the backlight settings on boot. However, settings will still be
       stored on shutdown.



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