KVMs with DisplayPort and USB over USB-C

I have a setup at my home office with two computers: a MacBook Air, and my FreeBSD work desktop. These are connected to a Dell 4K monitor in two ways: The MacBook Air is connected over a single USB-C cable that delivers power, DisplayPort, and a USB 2.0 hub for my mouse, keyboard, and webcam. I plug in one cable, and it all connects. It’s great! The FreeBSD desktop uses a regular DisplayPort cable to its discrete graphics card, because that’s all it has. This is what it looks like: ┌─────────┐ ┌───────────┐ │ FreeBSD ├─────────┤ Dell │ │ Desktop │ DP │ Monitor │ └─────────┘ │ │ │ │ ┌─────────┐ │ Internal │ │ MacBook ├─────────┤ USB hub │ │ Air │ USB-C: └─┬───┬───┬─┘ └─────────┘ • Power │ │ │ • USB │ │ │ • DP │ │ │ │ │ │ USB 2.0 │ │ │ │ │ │ ┌─────┴─┐ │ │ │ Mouse │ │ │ └───────┘ │ │ ┌────────┴─┐ │ │ Keyboard │ │ └──────────┘ │ ┌──────┴─┐ │ Webcam │ └────────┘ Keen-eyed readers may have already noticed the problem. This single USB-C cable works great for my MacBook Air, but the deskt ... Read full article.