[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx: [Bug 213945] New: Unable to power off iMac16,2]

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----- Forwarded message from bugzilla-daemon@xxxxxxxxxxxxxxxxxxx -----

Date: Mon, 02 Aug 2021 16:02:47 +0000
From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx
To: bjorn@xxxxxxxxxxx
Subject: [Bug 213945] New: Unable to power off iMac16,2
Message-ID: <bug-213945-41252@xxxxxxxxxxxxxxxxxxxxxxxxx/>

https://bugzilla.kernel.org/show_bug.cgi?id=213945

            Bug ID: 213945
           Summary: Unable to power off iMac16,2
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.0
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: PCI
          Assignee: drivers_pci@xxxxxxxxxxxxxxxxxxxx
          Reporter: kevo@xxxxxxxxxxxxxxxxx
        Regression: No

Created attachment 298155
  --> https://bugzilla.kernel.org/attachment.cgi?id=298155&action=edit
dmesg

I believe this bug is very similar if not the same to
https://bugzilla.kernel.org/show_bug.cgi?id=103211.

I have managed to work around it and have the computer power off by using the
two setpci commands from comment 298 in bug report 103211 in a systemd shutdown
script placed in /lib/systemd/system-shutdown.

#!/bin/sh

case $1 in
        poweroff)
        setpci -s1c.0 0x20.l=0xf011f001
        setpci -s1c.0 0x24.l=0xf031f021
        ;;
esac

Without the script the computer will just hang at shutdown. It also will not
suspend properly. It looks like it does, but then it will not wake up and I
have to hard power it down by holding the power button for 10 seconds before I
can turn it back on again.

I am attaching the output of dmesg, lspci, dmidecode and /proc/iomem and
/proc/ioports to aid in possibly extending the quirk fix from the previous bug
report. Hopefully the issue is similar enough that it will be a quick fix.

I do believe I am running the latest BIOS (427.140.8.0.0 06/13/2021) which I
believe was installed when I installed Big Sur.

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