Comment # 28 on bug 1174278 from Adam Reichold

(In reply to Adam Reichold from comment #27)
> At this point, I suspect something SUSE specific being the root cause here:
> While downgrading the firmware package did help and upgrading to
> kernel-firmware-20201005-337.1.noarch.rpm from
> https://build.opensuse.org/package/show/home:tiwai:branches:Kernel:HEAD/
> kernel-firmware did also work, just using the plain upstream amdgpu folder
> from
> https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git
> and dumping it into /lib/firmware/updates works as well. (I used
> firmware_class.dyndbg=+p to check that the update files I fetched directly
> via Git are loaded).

I am sorry for spamming this bug report, really. But this is getting weirder
still: I have no revert to a clean Tumbleweed 20201011-722.1 and everything
still works. So booting into the old firmware once seems to restore the system
until something unknown happens that breaks the new firmware?!