Enable and disable the HDMI port on the Raspberry Pi. Uses cec-hdmi. Works on Raspberry Pi 4 as well.

rpi-hdmi.sh

#!/bin/bash

# Enable and disable HDMI output on the Raspberry Pi

# The script uses the cec-hdmi command to manage the hdmi interface.
# https://pimylifeup.com/raspberrypi-hdmi-cec/

# On a Raspberry Pi 4 i could only get this to work if i used the hdmi 2 port.

# To setup the script run "echo 'scan' | cec-client -s -d 1" to identify the adress of the HDMI unit.

_CEC_="0.0.0.0"

_LOG_="/home/pi/rpi-hdmi.log"

is_off() {

        if [ "$(echo "$(echo "pow $_CEC_" | cec-client -s -d 1)" | awk '/power/ { print $3 }')" != on ]
        then
                return 0
        else
                return 1
        fi

}

turn_on() {

        echo "on $_CEC_" | cec-client -s -d 1
        
        sleep 5

	if is_off
	then
		# If TV did not turn on exit functin with error
		return 1
	else
		echo "$(date +"%b %d %T") TV turned on" >> "$_LOG_"
	fi

}

turn_off() {

        echo "standby $_CEC_" | cec-client -s -d 1
        
        sleep 5

	if is_off
	then
		echo "$(date +"%b %d %T") TV turned off" >> "$_LOG_"
	else
		# If TV did not turn off exit functin with error
		return 1
	fi

}

case $1 in
        off)

		while ! turn_off
		do
			echo "$(date +"%b %d %T") waiting for tv to turn off" >> "$_LOG_"
			sleep 5
		done

        ;;
        on)
                if is_off
                then
                        while ! turn_on
			do
				echo "$(date +"%b %d %T") waiting for tv to turn on" >> "$_LOG_"
				sleep 5
			done

                        curr_vt=$(fgconsole)
                        if [ "$curr_vt" = "1" ]
                        then
                                chvt 2
                                chvt 1
                        else
                                chvt 1
                                chvt "$curr_vt"
                        fi
                fi
        ;;
        status)
                if is_off
                then
                        echo "off"
                else
                        echo "on"
		fi
        ;;
        *)
                echo "Usage: $0 on|off|status" >&2
                exit 2
        ;;
esac

exit $?