[solved] Radeon driver broken by recent firmware updates ...

Immediately after recent Mageia 6 radeon firmware updates, I am experiencing video problems with my FireGL card. The greeter screen is flashing erratically and ksmserver is taking segfaults on launch. After multiple attempts is eventually succeeds and there are no further problems until the next login attempt from the greeter. This problem surfaced immediately after the firmware updates were installed and has never occurred prior to those updates, so I am pretty confident they are the source of the problem. I am also hesitant to go for a new video card until this whole meltdown spectre problem is fully addressed. I don't know whether it affects GPUs but I am not sure I want to spend any money until that mess gets resolved. Is anyone else having this problem? Any suggestions as to how to deal with it?