Shutdown -p now; Not Powering Off

ksolowoniuk said:
Would you know how I can troubleshoot this a little deeper before I try and report it?
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There are many things to try to exclude possible causes.
Power-off still doesn't work without anything except / mounted? This means it's not a storage device having trouble.
What happens after the physical shutdown button? In case no power-off, the PSU doesn't get a signal from the operating system. --> Is the ACPI module present and working correctly? But is NUC ATX anyway? It could be different.
Many more things...
 
I discovered that the issue with not powering off is only triggered if "hw.i915kms.enable_guc=1". It still only affects drm-66-kmod/drm-latest-kmod, drm-61-kmod still works even with "hw.i915kms.enable_guc=1". I've reported the bug but no response so far.

Bug Report
 
$ sysctl -d hw.i915kms.enable_guc
hw.i915kms.enable_guc: Enable GuC load for GuC submission and/or HuC load. Required functionality can be selected using bitmask values. (-1=auto [default], 0=disable, 1=GuC submission, 2=HuC load)
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mer said:
Interesting. What does that sysctl do?
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It's supposed to offload graphics related tasks from the CPU to the GPU directly and supposed to operate more efficiently. It can work in conjunction with HUC to help with h265 acceleration. I haven't tried to benchmark anything and honestly on my NUC 13 mpv playback is smooth and clear without it, but I did discover that it causes issues with shutdown/rebooting with newer versions of the drm kmod.
 
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