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Last active July 19, 2023 05:56
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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.
#!/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
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ghost commented May 27, 2018

Hi, never done any coding whatsoever before, but thought I’d try my hand with dakboard. I’ve loaded it up and working on my monitor through raspberry pi, and followed the script above but I’m getting lost with how to complete the rest of it. Is there an idiots guide to getting this to work?
Thanks in advance

@leemcarthur
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@usafle & @wmcollins - yes I did figure it out. I wrote out the syntax here after much trial and error:

I have a whole other issue with crontab not running at all, or rather, running two processes right now:

ps -eaf | grep cron

Output is:

root 360 1 0 20:58 ? 00:00:00 /usr/sbin/cron -f
pi 1303 1294 0 20:59 pts/0 00:00:00 grep --color=auto cron

So its running as the pi user as well as root? Could this be the issue why my rpi-hdmi.sh script isn't running?

@SteveMacLowell
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@leemcarthur - not sure if you got your answer, but the second cron you see is actually capturing that the second part of your command (grep cron) is running.

@dlasher
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dlasher commented Jan 26, 2019

Couldn't make this script work right on Pi3's.. screen would go off, then never go back on, error message was "failed to set"

Searched and found:

tvservice is not the best to turn off and on the screen. Much better way to do this (found after a day of searching) is using vcgencmd command (more on this here).
vcgencmd display_power 0 turns off the screen
vcgencmd display_power 1 turns on the screen
(From Here : https://raspberrypi.stackexchange.com/questions/52042/turning-tvservice-on-and-off-leaves-screen-blank )

works perfectly.

@DonSpain
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I am a senior citizen, with the ambition to use DAKboard to coordinate daily activities between myself and my wife. We have entered the stage in life were we often forget what we are told by the other. DAKboard is perfect for the purpose to keep each other updated on what is coming up the next days. I am not at all familiar with coding, but my experience is good with cut and paste. So DIASHER (my screen also does not come back on in he morning), what would the totalt script look like? Are you able to give me a hand?

@SirCrocker
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Hi @DonSpain, in case you haven't found an answer yet I made a small script that uses vcgencmd and works with DAKboard.
(Link to it: https://gist.github.com/SirCrocker/937d06f8f2c1227a83802b9b77f60ba0)

@JMS1717
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JMS1717 commented Apr 4, 2019

@SirCrocker can you copy and paste this INSTEAD of the TV Service one or do you have to do other stuff in crontab to accommodate?

@LFAB3
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LFAB3 commented Sep 2, 2019

It works on Raspberry Pi 4, but is necessary run it twice for HDMI poweroff.
Thanks!

@manconti
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@quelleck, your fork worked perfectly on my Raspberry PI with the latest version of Rasbian as of Jan 2020. Thank you!

@jomy-matthews
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Good script. Is there a similar script to disable the SPI port at night time? I have a youtube subscribers LCD running along with the Dakboard setup and I want them both to turn off at the same time. Will the same code above also work for the SPI port? Thanks in advance.

@JeedHome44
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hello, my raspberry Pi3B + Recalbox activates my automatic HDMI switch even when the Pi has no power. So this script allows you to completely disable the HDMI port when the Pi is turned off?

@JeedHome44
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sudo vcgencmd display_power 0

Turns off video output.

sudo vcgencmd display_power 1

Turns on video output.

More easy no?

@JeedHome44
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don't work...

@macninja
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I couldn't get it to work so I rewrote it to use cec-hdmi instead.

https://gist.github.com/macninja/6c13596f06206eec162f9dce1fc4313b

I have it working on a Raspberry Pi 4. But only in HDMI port 2.

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