systemd-backlight@.service(8) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | KERNEL COMMAND LINE | SEE ALSO | COLOPHON

SYSTEMD-BACKLIGHT@.SERVICE(8)d-backlight@.serviceD-BACKLIGHT@.SERVICE(8)

NAME         top

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

SYNOPSIS         top

       systemd-backlight@.service

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

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

DESCRIPTION         top

       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.

KERNEL COMMAND LINE         top

       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         top

       systemd(1)

COLOPHON         top

       This page is part of the systemd (systemd system and service
       manager) project.  Information about the project can be found at
       ⟨http://www.freedesktop.org/wiki/Software/systemd⟩.  If you have
       a bug report for this manual page, see
       ⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
       This page was obtained from the project's upstream Git repository
       ⟨https://github.com/systemd/systemd.git⟩ on 2021-06-20.  (At that
       time, the date of the most recent commit that was found in the
       repository was 2021-06-19.)  If you discover any rendering
       problems in this HTML version of the page, or you believe there
       is a better or more up-to-date source for the page, or you have
       corrections or improvements to the information in this COLOPHON
       (which is not part of the original manual page), send a mail to
       man-pages@man7.org

systemd 249                                SYSTEMD-BACKLIGHT@.SERVICE(8)

Pages that refer to this page: kernel-command-line(7)systemd.directives(7)systemd.index(7)