[Bug 249987] Lenovo X120e touchpad failing

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249987

--- Comment #17 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: wulf
Date: Fri Nov 20 00:13:31 UTC 2020
New revision: 367854
URL: https://svnweb.freebsd.org/changeset/base/367854

Log:
  psm(4): Disable AUX multiplexer probing on all Lenovo laptops.

  Rudimentary AUX multiplexing support was added to kernel to make possible
  touchpad initialization on some HP EliteBook laptops with trackpoint.

  Disable multiplexer probing on all Lenovo laptops now as they use touchpad
  pass-through port rather than AUX multiplexer to connect trackpoint and
  at least two model (X120e and X121e) is known for getting PS/2 AUX port
  dysfunctional after switching back to hidden multiplexing mode.

  AUX MUX probing can be reenabled with setting of hw.psm.mux_disabled loader
  tunable to 0.

  PR:           249987
  Reported by:  jwb
  MFC after:    2 weeks

Changes:
  head/sys/dev/atkbdc/atkbdc.c
  head/sys/dev/atkbdc/atkbdcreg.h
  head/sys/dev/atkbdc/psm.c

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