Created attachment 851464 [details]
Xorg.0.log & dmesg after enabling IOMMU in BIOS; with radeon.cik_support=0
amdgpu.cik_support=1; without drm.debug=0x1e log_buf_len=1M
After enabling IOMMU in BIOS, no improvement was apparent. I contacted ASUS
about this via browser chat. It was escalated. I'm supposed to hear back in
24-48 hours via email.