I was searching for the date thinking this had to be old, but it's not. It's very recent, but the author does seem to be using some older hardware. I did have a

I was searching for the date thinking this had to be old, but it's not. It's very recent, but the author does seem to be using some older hardware. I did have a problem with 4K-DCI and KVM switches at one time: https://battlepenguin.com/tech/4k-uhd-kvm-switches-the-startech-sv231mdpu2-and-the-iogear-GCS62DP/ https://battlepenguin.com/tech/4k-uhd-kvm-switches-the-start... Since then I've switch to a UDH monitor and a TESmart HDMI KVM switch. It can do 60Hz with HDR on my Windows and PS4 and 60Hz/non-HDR on Linux with the amdgpu (open source) Radeon drivers. I had no issues at all with the full resolution an refresh rate, either directly connected or with that KVM.