I've noticed sharing one monitor with multiple computers has always been a pain point... over most of my life.

By the way, I've always found having a dumb usb switch (for each device) and a dumb video switch to be the best way to eliminate incompatibilities. But everyone wants to get fancy and "smarten up" their kvm to use hotkeys and it screws with latency or keyboard state or just adds weirdness.

So I think the smartest place to put kvm functionality is probably at the keyboard, in the mouse and the monitor.

Or we should have an open kvm solution