https://bugzilla.kernel.org/show_bug.cgi?id=215652
--- Comment #4 from Erhard F. (erhard_f@mailbox.org) --- No I don't use an initrd. The kernel to boot the Talos is on a boot partition, modules are loaded from root partition. Which worked in 5.16 and before. Now I am getting this "could not insert 'radeon': Unknown symbol in module".
Though this may explain the 2nd error I got when building radeon statically into the kernel. I'll add the firmware in-kernel and see if the error message changes and whether it actually works then.