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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 14 Dec 2017 14:47:33 -0800
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Subject: Re: Linux 4.15-rc2: Regression in resume from ACPI S3
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
        Maarten Lankhorst <dev@mblankhorst.nl>,
        Michal Hocko <mhocko@kernel.org>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
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        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        "the arch/x86 maintainers" <x86@kernel.org>,
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On Thu, Dec 14, 2017 at 2:36 PM, Thomas Gleixner <tglx@linutronix.de> wrote:
>
> But, because the silly firmware comes out of suspend with all PIC lines
> unmasked for whatever reason, the PIC can observe that IRQ being raised and
> the CPU not handling it. So yes, I forgot about 7 being magic, but I still
> think it's the firmware which causes it by unmasking the PIC irqs.

Yes, that sounds quite likely.

            Linus