The KDE Plasma Linux desktop environment is already a feature-rich desktop for both productivity and gaming, but the KDE development team has been hard at work adding ever more features to the DE and polishing the experience. One of the newest additions to KDE, apparently coming in Plasma 6.7 and no...
Doesn’t work. Not a Linux issue. No graphics card or motherboard maker connects the hardware correctly to support CEC on PCs. It’s an industry-wide practice.
There is the pulse eight injector which together with software can inject CEC with a USB connection with the caveat it can’t turn your computer on and it’s a hacky and imperfect solution for tinkerers rather than production ready equipment. Also it’s only HDMI 2.0 not 2.1.
A pulse 8 would actually be very good with this. You can turn the computer on with a USB remote and the pulse 8 would send a signal to turn in the TV. From that point on, everything else would be controlled with the USB remote talking directly to the computer.
Also the website says CEC will work, so maybe they have a more elegant solution already