[Bug 253279] kern/atkbdc/psm: Synaptics Touchpad detection fix when connected to both PS/2 and SMBus.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253279

            Bug ID: 253279
           Summary: kern/atkbdc/psm: Synaptics Touchpad detection fix when
                    connected to both PS/2 and SMBus.
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: tomek at cedro.info

Synaptics Touchpad is not detected correctly when connected both to PS/2 and
SMBus at the same time over multiplexer - by default it is detected as simple
PS/2 mouse and no gestures work. This affects Panasonic Toughbook laptops.

This issue is detailed here:
https://github.com/wulf7/iichid/issues/53

The review is here:
https://reviews.freebsd.org/D28502

Credits for this fix goes to Wulf - Big Thank You :-)

Best regards :-)
Tomek

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