NAME

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

SYNOPSIS

       systemd-backlight@.service

       /usr/lib/systemd/systemd-backlight save [backlight|leds]:DEVICE

       /usr/lib/systemd/systemd-backlight load [backlight|leds]:DEVICE

DESCRIPTION

       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. The percentage can be adjusted by
       specifying a percentage (needs to be suffixed with "%", e.g.  "30%") to the property ID_BACKLIGHT_CLAMP.

KERNEL COMMAND LINE

       systemd-backlight understands the following kernel command line parameter:

       systemd.restore_state=
           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.

           Added in version 209.

SEE ALSO

       systemd(1)