It remains interesting (maybe) that you're having problems with 10.0.1 and I
don't.

Looking at the commit, with an outside eye, it seems to be consolidating bits
of code that were split out for different cards into a single implementation.
So is it possible this bug actually arose some time back, only affecting a few
cards (eg: yours) but after the consolidation it affects more cards (eg: now
including mine too).

We're both south-islands hd7000-series cards, but not the exact same. Idunno,
just my observations.

Can you take a video like the one I did (maybe just for consistency using the
video sample I uploaded, linked in an earlier comment), so we can actually all
see and confirm it's the same problem?