With Ubuntu 22.04 ARC installation guide, NUC12 NUC12SNKi72 lost its ARC 770M in run-time

[alee18x]

Hi Intel GPU people

I followed the instruction at https://dgpu-docs.intel.com/driver/client/overview.html, to enable the up-to-date A770m of NUC12 with Ubunut Linux kernel 5.19.0-46-generic, and ARC 770M is totally gone... never show up. Meanwhile, no HDMI and Display Port signal can be found either.

Earlier than this, I once used Ubuntu 20.04 with a month older i915 dkms, and it still worked properly.

Here is debug file I captured followed by the guide of installation. Very depressed and struggle with these ARC GPU desperately. I onced tried kernel command line of pci-stub.ids, i915 force_probe, turn off ACPI/UEFI PCI-E power management in NUC BIOS. Nothing can work.

debug.zip

[eero-t]

Attached "lspci" output lists only integrated ADLP iGPU [1]. Almost like your Arc is disabled in BIOS or disconnected...?

[1] This shows all GPUs that are on the PCI bus: lspci | grep -e VGA -e Display