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

* [bugzilla-daemon@bugzilla.kernel.org: [Bug 213945] New: Unable to power off iMac16,2]
@ 2021-08-02 16:48 Bjorn Helgaas
  0 siblings, 0 replies; 2+ messages in thread
From: Bjorn Helgaas @ 2021-08-02 16:48 UTC (permalink / raw)
  To: linux-pci; +Cc: kevo

Thanks for the report, Kevin.

Could you also attach the dmesg log from booting with "pci=earlydump"?
The kernel really should log the BARs and windows we get from firmware
before we change anything, but we currently do not, so "pci=earlydump"
is the only way to get that.

----- Forwarded message from bugzilla-daemon@bugzilla.kernel.org -----

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

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@kernel-bugs.osdl.org
          Reporter: kevo@gatorgraphics.com
        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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