Public bug reported:

TrackPoint's middle button is not detected, so TrackPoint scroll didn't
work either.

$ xinput list-props 12
Device 'TPPS/2 IBM TrackPoint':
        Device Enabled (140):   1
        Coordinate Transformation Matrix (142): 1.000000, 0.000000, 0.000000, 
0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
        Device Accel Profile (266):     0
        Device Accel Constant Deceleration (267):       1.000000
        Device Accel Adaptive Deceleration (268):       1.000000
        Device Accel Velocity Scaling (269):    10.000000
        Device Product ID (260):        2, 10
        Device Node (261):      "/dev/input/event13"
        Evdev Axis Inversion (306):     0, 0
        Evdev Axes Swap (308):  0
        Axis Labels (309):      "Rel X" (150), "Rel Y" (151)
        Button Labels (310):    "Button Left" (143), "Button Unknown" (305), 
"Button Right" (145), "Button Wheel Up" (146), "Button Wheel Down" (147), 
"Button Horiz Wheel Left" (148), "Button Horiz Wheel Right" (149)

"Button Unknown" seems to be the TrackPoint itself.

This is a ThinkPad E470 and a 16.04 fully updated fresh install.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-input-evdev-hwe-16.04 1:2.10.2-1ubuntu1~16.04.1 
[modified: usr/share/X11/xorg.conf.d/11-evdev-trackpoint.conf]
ProcVersionSignature: Ubuntu 4.8.0-39.42~16.04.1-generic 4.8.17
Uname: Linux 4.8.0-39-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Mar  6 22:16:21 2017
SourcePackage: xserver-xorg-input-evdev-hwe-16.04
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xserver-xorg-input-evdev-hwe-16.04 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1670492

Title:
  no "button middle" detected

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