I’m sorry, I only now saw that you’re on a brand-new Ryzen 5900, those are only supported by kernel 5.10+. You’ll have to install that manually:
You will need 4 packages
linux-headers-XX
linux-headers-XX-generic
linux-image-unsigned-XX-generic
linux-modules-XX-generic
from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.10.14/
Afterwards, please check if the correct AMD graphics is displayed
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