SYSTEMD-BACKLIGHT@.SERVICE(8)emd-backlight@.serviceEMD-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

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 2018-02-02.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2018-02-02.)  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 234                                    SYSTEMD-BACKLIGHT@.SERVICE(8)

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

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