Hey!
As you can tell from the title, for some reason, on KDE Plasma Arch (CachyOS) one of my monitors is only showing at 1024x768 and labelled as "HDMI-A-1-unkown"
This Monitor is hooked up to my AV Receiver, which then goes into the PC via HDMI.
Monitor>AMP>PC
Works just fine on windows, and I use this passthrough for my Audio too (Which also isn't being picked up due to it showing as hdmi known)