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.
systemd-backlight understands the following kernel command line
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.
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
page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2016-09-01. If you dis‐
cover 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
systemd 231 SYSTEMD-BACKLIGHT@.SERVICE(8)