[Unit]
Description=Turns off Raspberry Pi display backlight on shutdown/reboot
ConditionPathIsDirectory=/proc/device-tree/rpi_backlight
DefaultDependencies=no
Before=umount.target

[Service]
Type=oneshot
ExecStart=/bin/sh -c '/bin/echo 1 > /sys/class/backlight/rpi_backlight/bl_power'

[Install]
WantedBy=reboot.target halt.target poweroff.target