From owner-freebsd-stable@freebsd.org  Thu Apr 29 22:11:42 2021
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From: Antony Uspensky <uspensky@x-art.ru>
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To: parv/freebsd <parv.0zero9+freebsd@gmail.com>
cc: Guido Falsi <mad@madpilot.net>, freebsd-stable@freebsd.org
Subject: Re: Updated to 13-STABLE in VirtualBox; on shutdown stuck after
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On Wed, 28 Apr 2021, parv/freebsd wrote:

> Solved the issue via ...
>
>  % sysctl hw.efi.poweroff=0
> ... after that shudown went on as expected. Got that from  ...
>
> https://forums.freebsd.org/threads/freebsd-13-does-not-shut-down-my-laptop.79853/

Well, this also solved my problem described in a message to this list:

Date: Thu, 1 Apr 2021 18:58:01 +0300 (MSK)
From: Antony Uspensky <uspensky@x-art.ru>
To: freebsd-stable@freebsd.org
Subject: ACPI poweroff is not working on 13.0
Message-ID: <alpine.BSF.2.00.2104011807560.82747@gw-old.x-art.ru>

I was wrong: it was EFI poweroff that did not work, not ACPI one.
I was too lazy to do a bisection, now I am OK.
Thank you for the tip!

Seems, this problem (non-working shutdown in EFI environment) is a POLA 
violation in 13.0. 
A.