Hi Rich!, He did NOT properly done it
1. XE driver + its
updated firmware (maybe not from TC repositories, but from kernel hub) must be loaded before anything else.
2. The
i915 must be forbid, which I think was not, because usually i915 auto-load as a stupid one itself, and then xe driver is useless.
It happened to me and then
grub boot parameters become useless. In TC i915 loads if using the provided gpu-kernel-*tcz + firmware*.tcz. From my experience with TC, for complex/cyborg APU (CPU+GPU) gen 12+, CORE.gz remaster is mandatory. YMMV.