I’m trying to create a setup where I can connect a PC and a laptop to a 2560x1440p 165hz (HDR) and 1920×1080 60hz monitor via a KVM for seamless switching of video, audio, peripherals etc. I have already bought a Delock DP 1.4 KVM and a matching DP 1.4 MST-Hub, only to realise that the MST-Hub doesn’t support framerates above 60hz even though it’s DP 1.4 compatible.
My question is:
Does the Club3D DP 1.4 KVM support these requirements, and do they have a matching 2 port MST-Hub?
Did you check that the DP 1.4 MST Hub supports DSC? I had to update the firmware of my Delock 87737 to get DSC support:
https://github.com/fwupd/fwupd/issues/1665
Also, I found that no DP 1.4 MST Hub supports DSC decompression for 10bpc.
https://www.reddit.com/r/UsbCHardware/comments/sx2ou3/looking_for_usb_c_dock_for_laptop_with_ryzen/
You need to select 8bpc or use a lower refresh rate or resolution or connect fewer displays. HDR usually requires 10bpc. Does Windows allow HDR with 8bpc?
Did you try connecting only one display to the MST Hub?
To check DSC support and DSC compression capabilities, you need to examine the DPCD registers of the DisplayPort device. I don’t know how to do that on a PC (except to dump the info from Linux or hackintosh/macOS)
https://github.com/joevt/AllRez
