[Unit]
Description=Turn off HDMI at powerdown
DefaultDependencies=no
Before=umount.target

[Service]
Type=oneshot
ExecStart=/bin/sh -c ' \
    killall xinit \
    && plymouth change-mode --shutdown show-splash \
    && sleep 10s \
    && /usr/bin/vcgencmd display_power 0 '

[Install]
WantedBy=poweroff.target