Welcome to the club. I have a Firepro 4900 and have been dealing sith the undetected GPU thing for months. Adobe broke it after 21.1.3, and decided, "We're not going to fix it. Buy a new graphics card".
Yes, that is Adobe's official answer. Buy a new graphics card.I don't recall any advance notice that this was imminent. I knew it would happen sometime, but springing it on us like this is pretty bush league.