linux-kernel - Re: [REGRESSION] 4.17 failed to probe ACPI PnP

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Date:   Wed, 20 Jun 2018 11:11:17 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Noah Davis <noahadvs@...il.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [REGRESSION] 4.17 failed to probe ACPI PnP

On Wed, 20 Jun 2018 09:28:40 +0200,
Rafael J. Wysocki wrote:
> 
> On Wed, Jun 20, 2018 at 8:37 AM, Takashi Iwai <tiwai@...e.de> wrote:
> > On Tue, 19 Jun 2018 10:38:50 +0200,
> > Takashi Iwai wrote:
> >>
> >> On Tue, 19 Jun 2018 10:28:42 +0200,
> >> Rafael J. Wysocki wrote:
> >> >
> >> > On Tue, Jun 19, 2018 at 8:12 AM, Takashi Iwai <tiwai@...e.de> wrote:
> >> > > Hi,
> >> > >
> >> > > there seems a regression regarding the probe of ACPI PnP devices.
> >> > > The detailed logs are found in openSUSE bugzilla:
> >> > >   https://bugzilla.opensuse.org/show_bug.cgi?id=1098074
> >> >
> >> > But that's on this particular machine, not in general, right?
> >> >
> >> > At least I don't see this on any of the systems in my office.
> >>
> >> Yes, it looks so.  4.17 and later works on my several machines, too.
> >>
> >> >
> >> > > In short, since 4.17, the laptop keyboard is lost on ASUS K501UW.
> >> > > Comparing the kernel messages and other logs indicates that the
> >> > > complete lost of ACPI PnP devices:
> >> > >
> >> > > On 4.16:
> >> > > [    0.390244] pnp: PnP ACPI: found 9 devices
> >> > >
> >> > > On 4.17:
> >> > > [    0.263266] pnp: PnP ACPI: found 0 devices
> >> > >
> >> > > ... and this leads to the failure of PS/2 keyboard detection due to
> >> > > the missing PNP030b entry as a result.
> >> > >
> >> > > Any hints for debugging this are appreciated.
> >> >
> >> > It looks like this may be related to the ACPICA changes that went in
> >> > during the 4.17 cycle.
> >> >
> >> > I would try 4.18-rc1 as there is an ACPICA fix in it that may be
> >> > related to this in theory.  If that doesn't help, I'd focus on the
> >> > ACPICA changes.
> >>
> >> OK, Noah, could you test later the kernel in OBS Kernel:HEAD repo?
> >> Now 4.18-rc1 kernel is being built there, and hopefully will finish
> >> soon later.
> >
> > 4.18-rc1 was confirmed to work, so something had fixed it.
> 
> Please check this commit
> 
> 5088814a6e93 ACPICA: AML parser: attempt to continue loading table after error
> 
> None of the other ACPICA commits that have gone in since 4.17 should
> affect the behavior at hand.

OK, I'm building a test kernel with this backport.  Stay tuned.


thanks,

Takashi