linux-kernel - Re: [REGRESSION 4.17] Spurious wakeup / reboot with power button

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Date:   Thu, 05 Jul 2018 14:12:44 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Thomas Hänig <haenig@...ifan.de>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION 4.17] Spurious wakeup / reboot with power button

On Thu, 05 Jul 2018 12:41:03 +0200,
Rafael J. Wysocki wrote:
> 
> On Thursday, July 5, 2018 11:50:11 AM CEST Takashi Iwai wrote:
> > On Thu, 05 Jul 2018 11:34:59 +0200,
> > Rafael J. Wysocki wrote:
> > > 
> > > Hi,
> > > 
> > > On Thu, Jul 5, 2018 at 9:05 AM, Takashi Iwai <tiwai@...e.de> wrote:
> > > > Hi,
> > > >
> > > > we've got a regression report since 4.17 about the behavior of
> > > > power-off with the power button.  When a machine is powered off with
> > > > the power button on desktop, it reboots after a few seconds instead of
> > > > power down.
> > > >
> > > > The manual power down via "systemctl poweroff" works fine, so it's
> > > > possibly some spurious wakeup by the power button action, and some
> > > > ACPI-related change is suspected.
> > > > The regression still remains in 4.18-rc3.
> > > 
> > > There are only a few ACPI commits directly related to power management
> > > between 4.16 and 4.17 and none of them looks particularly suspicious.
> > 
> > OK, interesting.
> > 
> > > It looks like the power button state may not be cleared sufficiently
> > > after it's been pressed which is now visible for some reason.
> > 
> > Hmm, where can such a state remain?  Since it happens after the
> > machine turned off, some (ACPI) wakeup bits?
> 
> Basically, yes.
> 
> It looks like a GPE may remain active which then triggers wakeup after
> shutdown.
> 
> On a hunch, I'm wondering if reverting commit
> 
> 18996f2db918 ACPICA: Events: Stop unconditionally clearing ACPI IRQs during suspend/resume
> 
> (may not revert clearly, though) makes any difference.

OK, I'm building a 4.17.x test kernel with that revert, in OBS
home:tiwai:bsc1099930 repo.

Thomas, could you try later the kernel in
  http://download.opensuse.org/repositories/home:/tiwai:/bsc1099930/standard/
?  It'll take an hour or so until the build finishes.


thanks,

Takashi