Cm2 Dongle Support ●

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 :

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. cm2 dongle support

It hardwires the connections without complex negotiation, so the compute module sees a simple HDMI signal and USB data lines. If you still get no HDMI, SSH into

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 . Plug it into a Raspberry Pi CM4 carrier

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.

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