Dongle Support — Cm2

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 .

Happy making, and may your dongle always be detected.

Remember the golden rule: . Get the order right, and you’ll save hours of frustration. cm2 dongle support

Let’s break down what C2M support means, why your dongle might not be working, and how to fix it.

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 Here’s why people get stuck: A standard USB-C

dtoverlay=disable-bt # optional, frees up UART if needed hdmi_force_hotplug=1 hdmi_group=2 hdmi_mode=16 # 1080p 60Hz, change as needed The hdmi_force_hotplug=1 is the key—it tells the GPU to output HDMI even if no display is detected at boot.

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 : Remember the golden rule:

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.

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.