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       #Post#: 2092--------------------------------------------------
       How to Disable HDMI on the Raspberry Pi
   DIR By: WB3IHY
       Date: December 12, 2019, 2:10 pm
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       For those of us who use Pi-Star on the Raspberry Pi, the HDMI
       port on the Pi board is basically of no use to us.  Yet on some
       models/configurations, the port remains active, drawing a little
       bit of power and generating a little bit of heat, even with
       nothing connected to it!
       Luckily, there is a way to disable that port if you want (and
       how to reactivate it later on if you need it).
       First, determine see of your version of Pi-Star has the code
       installed that you need.  SSH into Pi-Star and enter
       which tvservice
       If you get a response like "/usr/bin/tvservice" then you've got
       the code.  If you get nothing in response, then you need to
       install it by putting your Pi into RW mode with
       rpi-rw
       And then install the code with the command
       sudo apt-get install libraspberrypi-bin
       Now you can control the HDMI port and see what state it's in.
       The commands are:
       What's the current status of the port?
       tvservice -s
       Turn the port off:
       tvservice -o (that's a lowercase "o," not a zero!)
       Turn the port on:
       tvservice -p
       Note that some editions of Pi-Star version 4 automatically
       "ship" with the port disabled.  So, if you find that it's off
       when you first test it...congratulations, there's nothing more
       to do.
       If you do find that it's on and want to make sure it stays off
       after a reboot, you'll need to edit a file to make it "stick."
       So, enter the following command:
       sudo nano /etc/rc.local
       And add the following code to the end of the file:
       # Turn off HDMI
       /usr/bin/tvservice -o
       Write the file, exit Nano, and voila: Enjoy a little bit of
       power saving and slightly less heat from your Pi.
       73,
       Joe, WB3IHY
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