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)

systemd 255                                                                        SYSTEMD-BACKLIGHT@.SERVICE(8)