Comment # 4 on bug 1185516 from Robert Mahar

Created attachment 848995 [details]
Case 1: No xf86 radeon driver, kernel from Tumbleweed 20210430

For this case I had previously removed the xf86 ATI driver as recommended to
force fallback to modesetting driver, that resulted in same crash and same
result previously described: black screen on primary monitor, defunct Xorg.bin
process, console unresponsive, no pointer and second graphics card not
producing any HDMI signal.

This suggest to me its not X related.