SYSTEMD-B...@.SERVICE(8) systemd-backlight@.service SYSTEMD-B...@.SERVICE(8)
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-B...@.SERVICE(8)
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