Date:   Fri, 06 Jul 2018 11:53:53 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Thomas H4nig <haenig@...ifan.de>,
        Erik Schmauss <erik.schmauss@...el.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>
Subject: Re: [REGRESSION 4.17] Spurious wakeup / reboot with power button

On Fri, 06 Jul 2018 11:40:43 +0200,
Rafael J. Wysocki wrote:
> 
> On Friday, July 6, 2018 8:55:18 AM CEST Takashi Iwai wrote:
> > On Fri, 06 Jul 2018 07:18:36 +0200,
> > Thomas H4nig wrote:
> > > 
> > > 
> > > 
> > > Am 05.07.2018 um 18:56 schrieb Takashi Iwai:
> > > > On Thu, 05 Jul 2018 18:02:11 +0200,
> > > > Rafael J. Wysocki wrote:
> > > >>
> > > >> [The Lv's address is not valid any more, so drop it from the CC]
> > > >>
> > > >> On Thursday, July 5, 2018 5:10:20 PM CEST Rafael J. Wysocki wrote:
> > > >>> On Thu, Jul 5, 2018 at 5:09 PM, Takashi Iwai <tiwai@...e.de> wrote:
> > > >>>> On Thu, 05 Jul 2018 16:00:14 +0200,
> > > >>>> Thomas H4nig wrote:
> > > >>>>>
> > > >>>>> Am 05.07.2018 um 14:12 schrieb Takashi Iwai:
> > > >>>>>> 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.
> > > >>>>>
> > > >>>>> With your new built kernel
> > > >>>>> 4.17.4-1.g6f23755-default
> > > >>>>>
> > > >>>>> the power button works again, so the revert solved the problem
> > > >>>>
> > > >>>> Thanks, that clarifies the cause.
> > > >>>> Adding Erik and Lv to Cc.
> > > >>>>
> > > >>>> I guess it's the side-effect by removing
> > > >>>>         acpi_ev_walk_gpe_list(acpi_hw_clear_gpe_block, NULL);
> > > >>>> in acpi_hw_disable_all_gpes().
> > > >>>>
> > > >>>> This function is called from acpi_power_off_prepare(), and the machine
> > > >>>> goes to power off without clearing the GPEs, hence it's woken up later
> > > >>>> unexpectedly.
> > > >>>
> > > >>> That's correct.
> > > >>>
> > > >>> We need to fix up that commit.  I'll try to prepare something.
> > > >>>
> > > >>
> > > >> Below is a patch to test that theory and maybe fix things if it is correct.
> > > >>
> > > >> What it does is to clear all GPEs after disabling them in
> > > >> acpi_power_off_prepare() which should address the issue if our theory
> > > >> about the underlying reason is correct.
> > > >>
> > > >> Please test.
> > > > 
> > > > OK, building a new test kernel package in OBS home:tiwai:bsc1099930-2
> > > > repo.  It'll appear at
> > > >   http://download.opensuse.org/repositories/home:/tiwai:/bsc1099930-2/standard/
> > > > 
> > > > Thomas, please give it a try later.
> > > > 
> > > > 
> > > > thanks,
> > > > 
> > > > Takashi
> > > 
> > > I am sorry, but with your test kernel 4.17.4-1.g76c6238-default the
> > > notebook again gets not properly powered off but restarts
> > 
> > Interesting.  The package version shows that the tested kernel must be
> > the right one.  (Though, it'd be good to double-check -- it's often
> > confusing if you have multiple same kernel versions on the system.)
> > 
> > If Rafael's patch doesn't work, we'd need to identify which change in
> > the commit 18996f2db918 has the effect.
> 
> I'd rather prefer the following modification of the previous patch to be
> tested:

OK, a new test kernel is being built on OBS home:tiwai:bsc1099930-3
repo.  The release number will be *.g3ecdf0b.
Please give it a try later.


thanks,

Takashi

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