Hello – thank you for the reply and apologies for my delay. After doing some research, seems like the Samsung firmware sends junk EDID data to upstream KVMs. Rather than screw around with it some more, I’ve swapped out the Samsung for an MSI, which works better out of the box, but not perfect. I will open a separate ticket to try to work out those issues. (to directly answer your question, the cables were 3m and 6n) Thank you!