Re: [REGRESSION] 4.17 failed to probe ACPI PnP

[Rafael J. Wysocki]

On Wed, Jun 20, 2018 at 10:20 PM, Takashi Iwai <tiwai@xxxxxxx> wrote:
> 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@xxxxxxx> 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@xxxxxxx> 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!

Will do tomorrow, thanks!