Why is the server not shutting down?

Question

Debian

I bought myself a second-hand server for virtual machines. Mother - supermicro x8dtl-6, 32 GB samsung ddr3, 2xXeon. Here are the engineer's processors, I don't know for sure, approximately x5650.
Installed Debian 9.4. I wanted to run virtual machines on KVM. The problem is that the server does not turn off on commands from the operating system.
Tried:

# shutdown -h
# shutdown -P
# shutdown -H
# init 0

Does not work. After about 5-8 seconds, the computer freezes tightly. Then just turn off the power button. I tried to just press the power button (in debian, EMNIP, by default it should shut down) - it also freezes. At the same time, on commands to reboot, it reboots correctly.

# shutdown -r
reboot

Actually the question is, what settings to watch in the BIOS? Where to look in the logs to clarify the situation?

Answer 1

BIOS version latest? Try playing around with ACPI settings, such as different versions of "ACPI Version Features".
Well, for the company https://ubuntuforums.org/showthread.php?t=2024096