https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=277450
--- Comment #9 from Andriy Gapon <a...@freebsd.org> ---
When hw.efi.poweroff=1, EFI shutdown routine is invoked much earlier than ACPI,
so ACPI has no play. It seems that the system hangs in the EFI routine instead
of powering off. So it must be a problem with the EFI implementation or
something like that.
FreeBSD EFI shutdown code is extremely simple:
if ((howto & RB_POWEROFF) != 0 && efi_poweroff)
(void)efi_reset_system(EFI_RESET_SHUTDOWN);
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