I updated "firmware-amd-graphics" to 20190502-1 and still experience freezing.
- Bug#928146: libdrm-amdgpu1: GPU hang Tuxicoman
- Bug#928146: Acknowledgement (libdrm-amdgpu1: GPU hang) Erwan
- Bug#928146: reported on freedesktop too Jérémy Viès
- Bug#928146: reported on freedesktop too Erwan
- Bug#928146: reported on freedesktop too Tuxicoman
