https://bugzilla.kernel.org/show_bug.cgi?id=204683
--- Comment #12 from Matthias Heinz (mh@familie-heinz.name) --- My last update, because I have no way to go forward from here on.
This bug seems to go way back longer than I initially thought. I'm currently at "drm-fixes-2018-08-31" in linux-drm and it's already in there, so it's probably pretty old.
I can't use any older kernel, because I need steam to run the games to test this. But steam wont work with anything older than 4.19.
BUT I found a game that almost instantly triggers this bug on startup: Insurgency.
Just start it and if that doesn't trigger it immediately, quit the game and start it again. It can take two to three times, joining a match helps, too, but it takes less than 5 minutes for each test.
So, please go ahead and fix this already, it's annoying.