Qubes poweroff hangs

Hello.

Desktop computer.
Hardware:

  • Asrock H81M-VG4
  • Intel i7-4770

OS:

  • Qubes 4.1.2 (R4.1) using KDE.

BIOS:

  • UEFI
  • Settings related to energy saving all set on.

Issue:
When choosing to shutdown, the display turns off but the pc led and PSU stays on. Afterward, I have to keep pushing the power button for over 4 seconds to cut the power off.
Testing a different distro (MX-linux) works as it should and the PC is powered off correctly.

Any idea about what to check ?

Thank you in advance.