Enable and disable the HDMI port on the Raspberry Pi: `rpi-hdmi on` to turn on, `rpi-hdmi off` to turn off. X is properly reinitialized when re-enabling.

rpi-hdmi.sh

#!/bin/sh

# Enable and disable HDMI output on the Raspberry Pi

is_off ()
{
	tvservice -s | grep "TV is off" >/dev/null
}

case $1 in
	off)
		tvservice -o
	;;
	on)
		if is_off
		then
			tvservice -p
			curr_vt=`fgconsole`
			if [ "$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 0

I have a standard console on VT1 and X11 on VT2. When I ran your script initially, it wasn't working. I poked around a bit and it seems that the VT numbers were getting mixed up for some reason. I added some sleeps in between the chvt commands and that seems to have fixed things. I let it burn in for a few hours running:

while true; do sudo ./rpi-hdmi off; sleep 10; sudo ./rpi-hdmi on; sleep 60; done

...and it seems to be working consistently now. Thanks for your help with this solution!

Just a note to other users, the fgconsole command must be called with sudo privileges or you will get an error:

Couldn't get a file descriptor referring to the console

@Chalta - are you saying you modified the line from:
curr_vt=`fgconsole`
to be:
curr_vt=sudo `fgconsole`

Hello
Is there a way to switch between hdmi and composite video without rebooting?

@IBKDan I found some comments suggesting vcgencmd instead of tvservice (info here). I forked this and used vcgencmd instead. So far no issues, and no need for sudo.

Hi all. I am trying to use this script to turn my raspberry pi on/off at different times depending if its a work day or a weekend.
I know how to setup the weekday AND weekend requests separate from one another. 

My requirements: 
M-F: (turn it off all day, only back on when we get home after work)
Every day during the week I want the HDMI port on at 7AM, and off at 9AM. I want it back on when we get home at work from 5:00 PM and to turn off for the day at 11PM.

Sat-Sun: (leave it on all day)
On at 7AM, Off at 11PM.

So since I have a global on and off time of 7AM and 11PM every day we could say:
00 7 * * * * /home/pi/rpi-hdmi.sh on
00 23 * * * * /home/pi/rpi-hdmi.sh off

Then for the weekdays:
00 9 * * 1–5 /home/pi/rpi-hdmi.sh off (off at 9AM)
00 17 * * 1–5 /home/pi/rpi-hdmi.sh on (on at 5PM)

My question to you is one of order — how do I know if these will be executed in this order? Is there a better way to write this?
Thanks!