The rc1 series of 5.14 kernels do not have the lockups and failed boots.

On Thu, 15 Jul 2021 12:03:10 -0700
stan via test <t...@lists.fedoraproject.org> wrote:

> This is a custom kernel boot message series:
> 
> Jul 15 11:44:57 fedora kernel: [drm] Loading CAICOS
> Microcode Jul 15 11:44:57 fedora kernel: radeon 0000:01:00.0: Direct
> firmware load for radeon/CAICOS_pfp.bin failed with error -2 Jul 15
> 11:44:57 fedora kernel: ni_cp: Failed to load firmware
> "radeon/CAICOS_pfp.bin" Jul 15 11:44:57 fedora kernel:
> [drm:evergreen_init [radeon]] *ERROR* Failed to load firmware! Jul 15
> 11:44:57 fedora kernel: radeon 0000:01:00.0: Fatal error during GPU
> init Jul 15 11:44:57 fedora kernel: [drm] radeon: finishing device.
> Jul 15 11:44:57 fedora kernel: [drm] radeon: ttm finalized Jul 15
> 11:44:57 fedora kernel: radeon: probe of 0000:01:00.0 failed with
> error -2

The problem was that firmware is now compressed, and there is a
configuration option to allow that so it is decoded before being sent
to the device. I didn't have that option set, so the compressed firmware
failed to load because it was compressed when the device was expecting
valid binary.  No gpu device, no scan of the EDID.
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