https://bugzilla.kernel.org/show_bug.cgi?id=209987
--- Comment #2 from Lee Starnes (lstarnes1024@gmail.com) --- It looks like this can be fixed by setting aconnector->num_modes to the return value from drm_add_edid_modes. At least one other place in amdgpu_dm.c sets struct amdgpu_dm_connector.num_modes to the return value of drm_add_edid_modes like this. I'm not familiar enough with AMDGPU or DRM internals to know if this will mess anything up.