A journey into DDC/CI β€” the remote-control protocol that has been hiding inside your display cable for over twenty years, and how it turned my monitor into a KVM. The desk that started it all My setup looks ordinary: a MacBook Air open on the desk (my primary machine), and an LG 32UN880K β€” a 32" 4K monitor with two HDMI ports, DisplayPort, and USB-C. The less ordinary part is behind the MacBook: an ASUS gaming laptop running Linux whose internal screen died. It now lives as a...