1SYSTEMD-BACKLIGHT@.SERVICE(s8y)stemd-backlight@.serviScYeSTEMD-BACKLIGHT@.SERVICE(8)
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NAME

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

10       systemd-backlight@.service
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12       /usr/lib/systemd/systemd-backlight save [backlight|leds]:DEVICE
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14       /usr/lib/systemd/systemd-backlight load [backlight|leds]:DEVICE
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DESCRIPTION

17       systemd-backlight@.service is a service that restores the display
18       backlight brightness at early boot and saves it at shutdown. On disk,
19       the backlight brightness is stored in /var/lib/systemd/backlight/.
20       During loading, if the udev property ID_BACKLIGHT_CLAMP is not set to
21       false, the brightness is clamped to a value of at least 1 or 5% of
22       maximum brightness, whichever is greater. This restriction will be
23       removed when the kernel allows user space to reliably set a brightness
24       value which does not turn off the display.
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KERNEL COMMAND LINE

27       systemd-backlight understands the following kernel command line
28       parameter:
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30       systemd.restore_state=
31           Takes a boolean argument. Defaults to "1". If "0", does not restore
32           the backlight settings on boot. However, settings will still be
33           stored on shutdown.
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SEE ALSO

36       systemd(1)
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40systemd 249                                      SYSTEMD-BACKLIGHT@.SERVICE(8)
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