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

Takashi Iwai
2018-07-05T12:12:44Z

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@suse.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