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KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.

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Trying to find a solution to a use case where I need to disable certain display outputs or focus one single display temporarily. (lemmy.world)

submitted 1 month ago* (last edited 1 month ago) by [email protected] to c/[email protected]

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I have a use case where I would like to play games on the TV in my living room.

For this I have purchased a HDMI KVM Extender which allows me to have an HDMI signal connected to my TV. This is working great, but the only problem is that i would like to disable the other outputs when I am not using them, mostly for ease-of-use with windows not opening on the monitors in the office while I am in the TV Room.

I have tried using kscreen-doctor with the command "kscreen-doctor output.HDMI-A-1.disable" which works, but wreaks havoc on the display configuration in KDE Plasma on my desktop.

One solution I have found is to simply pull out the display connectors that I don't need on the PC, which works as intended. Only problem is that its a bit brute force. I had hoped to find something with similar functionality but controlled from the system. IE. a script, shortcut or similar.

Asking here in hopes that someone can suggest a way to get this to work!

System info:

Operating System: Fedora Linux 40
KDE Plasma Version: 6.1.4
KDE Frameworks Version: 6.5.0
Qt Version: 6.7.2
Kernel Version: 6.10.8-200.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 24 × AMD Ryzen 9 5900X 12-Core Processor
Memory: 31.3 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX

EDIT: OMG, this solution was so simple, but completely just worked. Just mirrored the main display and fixed individual refresh rates, even works when turning the extender on and off. Major thanks to @pandapoo for the idea

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[–] [email protected] 2 points 1 month ago* (last edited 1 month ago)

Haha nice, I'm glad I threw that in at the bottom lol.

If you do end up needing to do something physical, and can't find a prefabricated item, look at getting 2 female HDMI breakout boards/connectors.

I believe there's 19 wires in total, but only two deal with power (+/-) and 1 that deals with clock signal (tmds?). Could probably move those over to 3 pin on/off toggle switch, directly wire the rest, and then flip the switch as needed.

Or even just the TMDS wire 1 pin toggle switch, might even do the trick.

Those pinouts might be different based on the HDMI version you're using, and I cannot stress this enough, I pulled that idea mostly out of my ass. I have some experience with this type of DIY, but none of it was with HDMI signals.

It is not intended as a final blueprint, just a starting point you figuring out a DIY toggle.