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

Status in linux package in Ubuntu:
  In Progress

Bug description:
  Middle button doesn't work on several Thinkpad laptops like E570,
  E475, E470, E575 and X1Carbon.

  When middle button fails to work, logs show:
  psmouse serio2: trackpoint: failed to get extended button data

  It fails to read out ext button info via PS2 command.
  Almost all the Thinkpad have 3 buttons, so set it to 3 button when it fails 
to read button info.

  And on Lenovo X1, there is a new version of trackpoint, add this ID
  for this new device.

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