OK I have now regression tested on the latest 19.10, with the above
^^software stack. All except incrementing the kernel from 5.8.11 to
5.8.13.

I can now confirm that the old bug has also re-appeared on 19.10 too. So
it is not only exclusive to 20.04.

To myself, I really don know what to try. But I had been holding off
upgrading to 20.04 only because of this bug. Daniel - do you need me for
any more testing on 19.10? So i may be free to upgrade? Thank you for
letting me know.

My opinion would be first try rolling back the nvidia driver stack, to a
version that was latest at the time when we last confirmed this bug was
fixed.

I.e.

nvidia-driver-450/eoan,now 450.57-0ubuntu0~0.19.10.2 amd64 [installed]
  NVIDIA driver metapackage

Roll that back.

Hopefully we can do this still on 20.04? Is that older package going to
still work on 20.04? Thanks again! Please get back in touch.

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Title:
  [xorg] multiple monitors: limits the framerate of faster 120/144hz
  monitors to 60hz

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