Cm2 Dongle — Support

Happy making, and may your dongle always be detected.

Here’s a helpful, practical blog post aimed at makers, retro-computing enthusiasts, or single-board computer (SBC) users. C2M Dongle Support: What It Is, Why You Need It, and How to Get It Working cm2 dongle support

At first glance, it looks like a typo for “USB-C to HDMI.” But C2M (Computer-to-Module) dongle support is something entirely different—and if you work with developer boards like the Raspberry Pi CM4 or CM5, it’s a game-changer. Happy making, and may your dongle always be detected

If you still get no HDMI, SSH into the Compute Module (or edit the SD card/eMMC boot partition) and add these lines to config.txt : If you still get no HDMI, SSH into

Why? Because most compute module carrier boards use the USB-C port in or dual-role mode, but they don’t implement the full Alternate Mode (Alt Mode) negotiation that commercial hubs expect.

Have a C2M dongle success story or a tricky setup? Drop a comment below—especially if you’ve tested it with a CM5 or a non-Raspberry Pi module like the Orange Pi CM4.

Here’s why people get stuck: A standard USB-C hub (like one from Anker or Dell) works with phones and laptops. Plug it into a Raspberry Pi CM4 carrier board… and nothing happens .