Tested:
1) Deleted contents of /lib/firmware/amdgpu , populated it with the 12 dimgrey firmware files, "sudo update-initramfs -c -k all", rebooted. System started, FPS are high (OK).
2) Reinstalled 20220329.git681281e4-0ubuntu3.4 from Synaptic. Updated the 12 dimgrey firmware files, "sudo update-initramfs -c -k all", rebooted. System started, FPS are high (OK).
Tested: amdgpu , populated it with the 12 dimgrey firmware files, "sudo update-initramfs -c -k all", rebooted. System started, FPS are high (OK). git681281e4- 0ubuntu3. 4 from Synaptic. Updated the 12 dimgrey firmware files, "sudo update-initramfs -c -k all", rebooted. System started, FPS are high (OK).
1) Deleted contents of /lib/firmware/
2) Reinstalled 20220329.