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

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Date:   Wed, 20 Jun 2018 22:20:55 +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 11:11:17 +0200,
Takashi Iwai wrote:
> 
> 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.

The result looks positive, things seem working with the backport.

Care to send it to Greg for 4.17.x stable?  Thanks!


Takashi