table of contents
- bookworm 252.30-1~deb12u2
- bookworm-backports 254.16-1~bpo12+1
- testing 256.7-2
- unstable 256.7-2
SYSTEMD-BACKLIGHT@.SERVICE(8) | systemd-backlight@.service | SYSTEMD-BACKLIGHT@.SERVICE(8) |
NAME¶
systemd-backlight@.service, systemd-backlight - Load and save the display backlight brightness at boot and shutdown
SYNOPSIS¶
systemd-backlight@.service
/lib/systemd/systemd-backlight save [backlight|leds]:DEVICE
/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. 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¶
systemd-backlight understands the following kernel command line parameter:
systemd.restore_state=
SEE ALSO¶
systemd 252 |