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

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Date:   Tue, 19 Jun 2018 08:12:57 +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: [REGRESSION] 4.17 failed to probe ACPI PnP

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

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.

Thanks!

Takashi