4.12.10 contains this commit:
commit 38c36f9d1fca5b5e6d2d1be13ab82d1ce714e4b1
Author: Aaron Ma <aaron...@canonical.com>
Date:   Fri Aug 18 12:17:21 2017 -0700

    Input: trackpoint - add new trackpoint firmware ID
    
    commit ec667683c532c93fb41e100e5d61a518971060e2 upstream.
    
    Synaptics add new TP firmware ID: 0x2 and 0x3, for now both lower 2 bits
    are indicated as TP. Change the constant to bitwise values.
    
    This makes trackpoint to be recognized on Lenovo Carbon X1 Gen5 instead
    of it being identified as "PS/2 Generic Mouse".
    
    Signed-off-by: Aaron Ma <aaron...@canonical.com>
    Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

This issue should be that stable-kernel lack this commit:
commit 293b915fd9bebf33cdc906516fb28d54649a25ac
Author: Oscar Campos <oscar.cam...@member.fsf.org>
Date:   Tue Jul 18 17:20:36 2017 -0700

    Input: trackpoint - assume 3 buttons when buttons detection fails
    
    Trackpoint buttons detection fails on ThinkPad 570 and 470 series,
    this makes the middle button of the trackpoint to not being recogized.
    As I don't believe there is any trackpoint with less than 3 buttons this
    patch just assumes three buttons when the extended button information
    read fails.
    
    Signed-off-by: Oscar Campos <oscar.cam...@member.fsf.org>
    Acked-by: Peter Hutterer <peter.hutte...@who-t.net>
    Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>

Please try 4.13.0 kernel, not stable branch, this will make middle
button work.

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https://bugs.launchpad.net/bugs/1715271

Title:
  Middle button of trackpoint doesn't work

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