Developer uses DDC/CI protocol to switch monitor inputs without buying hardware

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A developer avoided purchasing a $10 HDMI switch by leveraging DDC/CI, a decades-old protocol embedded in HDMI, DisplayPort, and USB-C cables that allows computers to send commands directly to monitors. The setup involved a MacBook Air and a headless ASUS Linux laptop sharing a single LG 32-inch 4K display, with the main challenge being how to switch inputs without repeatedly pressing physical buttons. Standard DDC/CI commands initially failed because the LG monitor requires an alternate addressing scheme, which the developer discovered using the BetterDisplay tool on macOS. Once the correct LG-specific input codes were identified, software tools on both macOS and Linux could switch the monitor's active input programmatically. The project cost roughly $4 in AI assistant usage and eliminated the need for additional hardware, dongles, or remote controls.

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