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I want to find a way to turn on and off a HDMI connected display with simple command. In past it used to be something with xrandr, but due to linux forever evolving, it is not working anymore.

i tried : sudo xrandr --output XWAYLAND0 --off > not working sudo vcgencmd display_power 0 > not working sudo xset dpms force off > not working

sudo or non sudo is same result... what it seems is that instead of something like HDMI-0, there is XWAYLAND0 as name of display

talking to chat gpt and searching the internet... like forever. This is second day i am trying to figure this out... Every time i am looking for a simple answer to a simple problem i am getting reminded why i hate linux so much... there just cannot be a simple solution, everything need to be overcomplicated. (rant)

dingo27mobile
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  • I feel your pain. OTOH, you could be dealing with a system like macOS - controlled by the world's largest corporation which *actively limits and denies* documentation to its users. Which one do you think works best for "people like us"? – Seamus Dec 26 '23 at 22:25

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As you're no doubt aware, Wayland is new. In LinuxWorld, new often equates to poorly documented. I wonder if you might have better luck using the older, but better-documented graphics system: X??

I run all of my systems headless, but AIUI you can switch from Wayland to X using the raspi-config utility. Start raspi-config from the command line by entering the following:

sudo raspi-config

When the menu presents, select 6 Advanced Options, and the sub-menu will list more options including A6 Wayland Switch between X and Wayland backends. Switch to X, and your older commands should (may?) work.

There are also a couple of "lower-level" solutions that may allow you to keep Wayland if you're inclined:

vcgencmd display_power 0  # `0` turns OFF; `1` turns ON

alternatively, install cec-utils & use that:

sudo apt update
sudo apt install libcec3 cec-utils
echo 'standby 0' | cec-client -s -d 1    # turns OFF
echo 'on 0' | cec-client -s -d 1         # turns ON
REFERENCES (all obtained via search engine `raspberry pi HDMI interface`):
  1. How to automatically turn off and on your monitor from your Raspberry Pi
  2. Using HDMI-CEC on a Raspberry Pi
Seamus
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  • Thanks Seamus, i will try both later and write if it worked. Seems not using the latest everything in Raspberry OS is better choice for common users. I can only wish RPI foundation would not push buggy ( = not battle and time proven ) software onto its users. – dingo27mobile Jan 02 '24 at 09:28
  • @dingo27mobile: That's why I run headless. – Seamus Jan 02 '24 at 18:52
  • I am somehow loosing comments here all over the stackexchange... strage. Anyways, i want to srite again that i usually use it headless too but i borked the system and can see only standard debian wallpaper (debian logo in middle), even mouse cursor stopped working and i cannot start anything via menu. At least i was able to dowload everything from pi via samba, so yeah, currently i "love" linux so much. I will reinstall whole system once again when i feel like it, probably after few months... – dingo27mobile Jan 02 '24 at 20:36
  • @dingo27mobile: Did this answer solve your problem? – Seamus Jan 02 '24 at 22:19