Linux 5.0-rc2 had changes to amdgpu that mentioned resume changes.

"drm/amdgpu: Don't ignore rc from drm_dp_mst_topology_mgr_resume()
drm/amdgpu: Don't fail resume process if resuming atomic state fails
drm/dp_mst: Add __must_check to drm_dp_mst_topology_mgr_resume()"

https://lkml.org/lkml/2019/1/13/146

could someone please test 5.0-rc1?