linux-kernel - Re: Linux 4.15-rc2: Regression in resume from ACPI S3

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Date:   Thu, 14 Dec 2017 14:47:33 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Maarten Lankhorst <dev@...ankhorst.nl>,
        Michal Hocko <mhocko@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Andy Lutomirski <luto@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: Linux 4.15-rc2: Regression in resume from ACPI S3

On Thu, Dec 14, 2017 at 2:36 PM, Thomas Gleixner <tglx@...utronix.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