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From:   "Rafael J. Wysocki" <rafael@kernel.org>
Date:   Tue, 11 Aug 2020 16:34:09 +0200
Message-ID: <CAJZ5v0h+n9VCz5=VixVbe_b=ZbTU3D=46stGhE9z7Y7yaUMJzw@mail.gmail.com>
Subject: Re: power-off delay/hang due to commit 6d25be57 (mainline)
To:     Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc:     Stephen Berman <stephen.berman@gmx.net>,
        "Rafael J. Wysocki" <rafael@kernel.org>,
        Zhang Rui <rui.zhang@intel.com>,
        Robert Moore <robert.moore@intel.com>,
        Erik Kaneda <erik.kaneda@intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Len Brown <lenb@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@acpica.org>
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On Tue, Aug 11, 2020 at 3:29 PM Sebastian Andrzej Siewior
<bigeasy@linutronix.de> wrote:
>
> On 2020-08-11 13:58:39 [+0200], Stephen Berman wrote:
> > him about your workaround of adding 'thermal.tzp=300' to the kernel
> > commandline, and he replied that this works for him too.  And it turns
> > out we have similar motherboards: I have a Gigabyte Z390 M Gaming
> > Rev. 1001 board and he has Gigabyte Z390 Designare rev 1.0.
>
> Yes. Based on latest dmesg, the ACPI tables contain code which schedules
> the worker and takes so long. It is possible / likely that his board
> contains the same tables which leads to the same effect. After all those
> two boards are very similar from the naming part :)
> Would you mind to dump the ACPI tables and send them? There might be
> some hints.

Do we have a BZ for this?  It would be useful to open one if not.

> It might be possible that a BIOS update fixes the problem but I would
> prefer very much to fix this in kernel to ensure that such a BIOS does
> not lead to this problem again.

I agree.

It looks like one way to address this issue might be to add a rate
limit for thermal notifications on a given zone.