Power off problem

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https://bbs.archlinux.org – Any help on the following would be appreciated.When I power off my motherboard in UEFI mode I've got no error messages but the power supply doesn't power off, only the hard disk (latest linux kernel x86_64, no difference whether init or systemd boots the system).And everything is all right when the motherboard powers off  having been booted in BIOS mode.In both cases I use "systemctl poweroff" or "shutdown -hP now" commands. Kernel options acpi=off or acpi=force don't solve the problem. unixsolo https://bbs.archlinux.org/profile.php?id=51252 (HowTos)