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[Timo Aaltonen <tjaalton@xxxxxxxxxx>]

** Also affects: linux-oem (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: linux-oem (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Invalid

** Changed in: linux-oem (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1746002

Title:
  TrackPoint: middle button doesn't work on TrackPoint-compatible
  device.

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Incomplete
Status in linux-oem package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Invalid
Status in linux-oem source package in Xenial:
  New

Bug description:
  Lenovo introduced 4 new TrackPoint compatible sticks those only
  support the minimum commands described in the spec, which has been
  used in the current Windows driver.

  Legacy TrackPoint: 0101 – 0E01

  ALPS: 0102 – FF02

  ELAN:0103 – FF03

  NXP: 0104 – FF04

  TrackPoint (ID: 01/02) report 0 button when reading the EXT_BUTTON
  command.

  Setting middle button enabled to make it work.

  Upstream patch:
  commit f5d07b9e98022d50720e38aa936fc11c67868ece
  Author: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
  Date:   Fri Jan 19 09:43:39 2018 -0800

      Input: trackpoint - force 3 buttons if 0 button is reported
      
      Lenovo introduced trackpoint compatible sticks with minimum PS/2 commands.
      They supposed to reply with 0x02, 0x03, or 0x04 in response to the
      "Read Extended ID" command, so we would know not to try certain extended
      commands. Unfortunately even some trackpoints reporting the original IBM
      version (0x01 firmware 0x0e) now respond with incorrect data to the "Get
      Extended Buttons" command:
      
       thinkpad_acpi: ThinkPad BIOS R0DET87W (1.87 ), EC unknown
       thinkpad_acpi: Lenovo ThinkPad E470, model 20H1004SGE
      
       psmouse serio2: trackpoint: IBM TrackPoint firmware: 0x0e, buttons: 0/0
      
      Since there are no trackpoints without buttons, let's assume the trackpoint
      has 3 buttons when we get 0 response to the extended buttons query.
      
      Signed-off-by: Aaron Ma <aaron.ma@xxxxxxxxxxxxx>
      Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=196253
      Cc: stable@xxxxxxxxxxxxxxx
      Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

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