DG2/A770 FW not ready / unexpected reset, GPU hang

Using a kernel from the 6.3 release candidates series, starting with rc5 (the first I've tested), as late as rc6, or using drm-tip 6.3.r1172410.766ccc538115, the system will fail to boot to a usable desktop at least 3 times out of 4. It may succeed the first time, but soft rebooting the system will fail to boot back to a usable desktop.

• System architecture: x86_64
  • Kernel version: 6.3.0-rc6-1-drm-tip-git-g766ccc538115
  • Linux distribution: Arch
  • Machine or mother board model: MSI B450 Tomahawk
  • Display connector: HDMI, DP
  • A full dmesg with debug information and/or a GPU crash dump: dmesg.txt
• Other attachments if relevant:
  • intel_reg_dumper output (see the guide) and VBIOS dump (see the guide) for display issues: (I am not authorized to view either of these guides, but Google found them elsewhere)
    • intel_reg_dumper:
      • GDM: regdump.1.txt
      • VT: regdump.2.txt
    • VBIOS dump: vbios.dump.gz
  • for GPU hang, get the last batch buffer (see the guide): I am not authorized to view this guide (403 error)

Futher commentary, this seems to be happening even if I cold reboot to a stable kernel (6.2.11) and then a forced cold reboot later, it will suddenly work again with whichever kernel I am using. This may be faulty hardware, though I am inclined to blame the motherboard and not the GPU, as this board has had problems with resetting GPUs in the past, especially when doing IOMMU detach/reattach.