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

[bugzilla-noreply at freebsd.org]

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

--- Comment #1 from Vladimir Kondratyev <wulf at freebsd.org> ---
As this patch disables PS/2 bytestream synchronization checks for all Synaptics
touchpads connected through the AUX MUX, we should find a better fix.

Could you:

1. Revert https://reviews.freebsd.org/D28502 patch
2. Find vendortype array in sys/dev/atkbdc/psm.c. It is located at 700-th line
and sets a probe order for different PS/2 device types.
3. Start moving of Synaptics entry from 8-th position to the top of the array
in one entry step with recompiling and testing of the kernel at each step until
touchpad becomes fixed.

P.S. Most probably, culprit is /* Microsoft IntelliMouse Explorer */, so you
can start iterating from it.

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