I'm on 19.8.2 now. Just after writing yesterday's post above Radeon informed me of another update, which I bravely installed. 🙂 Everything's looking good so far. At least no black screens or any other erratic behaviour. But I am not a gamer nor am I using the graphics adapter heavily with any other application. This is my workplace computer, hence I cannot tell if it would work for anybody else.
Even until 19.9.1 (not installing 19.9.2 and above yet), OBS still doesn't want to use my primary GPU. Even the encoder hates the discrete GPU.
Guys!! Its fixed, (well for me atleast)
Install the latest 19.7.1 optional drivers. Everything works well now! Finally!
I did a clean install so would recommend that.
Thanks a lot man it worked for me i was having the same problem