Unable To Complete Login With New GPU

GPU recently died. Used APU for a couple of weeks.
New XT6700 GPU arrived yesterday, should be supported by 5.14 Kernel.
Seems to complete luks decryption than hangs not moving to user login.
Assume this isn’t a hardware issue but Qubes having issues with the PCI lane/device specification/assignment? Login via APU still works.
Does anyone have some ideas what might cause this and how to fix it?

Try this

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Thanks but I’m not sure this is the correct guide for my situation.
Ideally I would want the new GPU to work like my old one without having to hide it and switching cables when booting into windows.

Also, the guide states: Move the file to /etc/X11 and rename it as xorg.conf :
mv /root/xorg.conf.new /etc/X11/xorg.conf

I currently only have a /etc/X11/xorg.conf.d directory with a 00-keyboard.conf file.

To edit the xen.cfg file using the nano editor:

sudo nano /boot/efi/EFI/qubes/xen.cfg

I have no directory in /boot/efi/

I’v temp added this via grub. F10>reboot, now the APU connected monitor is used but hangs again on decryption complete, not moving to user login.
When I press power down it switches to terminal on the GPU connected display with the same message as in initial screenshot.

Any other ideas please? I’m quite desperate to get my new GPU working without reinstall and I’m happy to make a donation to whoever can come up with a working solution.

Try installing the kernel-latest version (Qubes-20221203-kernel-latest-x86_64.iso): Index of /qubes/iso/

These weekly builds are referenced here: QubesOS 4.1 Signed Weekly Builds