[email protected](8) [email protected] [email protected](8) NAME [email protected], systemd-backlight - Load and save the display backlight brightness at boot and shutdown SYNOPSIS [email protected] /usr/lib/systemd/systemd-backlight DESCRIPTION [email protected] 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 udev property ID_BACKLIGHT_CLAMP is not set to false value, 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. 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. SEE ALSO systemd(1) systemd 219 [email protected](8)