https://bugzilla.kernel.org/show_bug.cgi?id=201957
--- Comment #29 from Matthias Heinz (mh@familie-heinz.name) --- Hi. This bug is already reported here by me https://gitlab.freedesktop.org/drm/amd/issues/953
If possible try a 5.5-rc kernel and see if it's fixed there. It's fixed - at least for me - in the drm-tree.
Best regards Matthias