As of 5.10.3, the regression appears to remain.
I think this is the upstream issue:
https://gitlab.freedesktop.org/drm/nouveau/-/issues/14
- Bug#976788: linux-image-5.9.0-4-amd64: nouveau ... Philip Stewart
- Bug#976788: linux-image-5.9.0-4-amd64: nou... Philip Stewart
- Bug#976788: nouveau: Re: linux-image-5.9.0... proctor
- Bug#976788: more info proctor
- Bug#976788: even more info proctor
- Bug#976788: linux-image-5.9.0-4-amd64: nou... Uros Knuples
- Bug#976788: update: also affected is linux... proctor
- Bug#976788: 5.9.0-5-amd64 also affected proctor
- Bug#976788: linux-image-5.9.0-4-amd64: nou... Philip Stewart
- Bug#976788: Patch to fix: nouveau DRM time... Philip Stewart
- Bug#976788: Fixed upstream: nouveau DRM ti... Philip Stewart
- Bug#976788: Fixed upstream: nouveau DR... Salvatore Bonaccorso
- Bug#976788: marked as done (linux-image-5.... Debian Bug Tracking System
