Sapphire Radeon RX 550 2GB PCIe x16
| Functionality | Driver Required? | More Info |
|---|---|---|
| None (so far) | Yes | GitHub Issue |
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Description and Notes
The Radeon RX 550 is a slightly older graphics card that is supported by the open source amdgpu driver in the Linux Kernel.
It will require a 1x to 16x adapter, or some other means of adapting the 16x-sized card pins into the 1x slot on the CM4 IO Board. You should also supply at least 5A of 12V power to the CM4 IO Board if you’re powering the card through the IO Board itself.
amdgpu (open source) driver
To get the amdgpu driver loaded, you have to recompile the Linux kernel for Pi OS.
Go to Device Drivers > Graphics support on the menuconfig step, and select the amdgpu driver to install.
Also make sure you have the AMD firmware installed (sudo apt install -y firmware-amd-graphics) or the driver will complain about missing files.
If you want to be able to boot the Pi all the way, make sure to blacklist the amdgpu kernel module:
sudo nano /etc/modprobe.d/blacklist-amdgpu.conf
# Put this inside the file and save it:
blacklist amdgpu
Now, after a reboot, you can explicitly load the module and see what happens by following dmesg in another terminal session:
sudo modprobe amdgpu
In my case, the entire Pi locks up and requires a hard power reset. Go figure.
See the linked GitHub issue for more details on how I have been debugging this card, and the patch I’ve used to get past a bad memset() call.
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Sapphire Radeon RX 550 2GB PCIe x16