[REGRESSION] 4.17 failed to probe ACPI PnP

[Takashi Iwai]

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