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>

This 2nd need to be merged to ubuntu kernel.

** Changed in: linux (Ubuntu)
       Status: New => In Progress

** Changed in: linux (Ubuntu)
   Importance: Undecided => Critical

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => AaronMa (mapengyu)

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

Title:
  Middle button of trackpoint doesn't work

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