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[Chow Loong Jin <hyperair@xxxxxxxxxx>]

By the way, I use this config with my Trackpoint:

hyperair@thinkpwn:/etc/X11/xorg.conf.d% cat 50-trackpoint-acceleration.conf
Section "InputClass"
        Identifier "trackpoint"
        MatchProduct "TPPS/2 IBM TrackPoint"
        Option "AccelerationProfile"  "2"
        Option "AccelerationNumerator" "25"
        Option "AccelerationDenominator" "10"
        Option "VertScrollDelta" "8"
        Option "HorizScrollDelta" "8"
EndSection

Section "InputClass"
        Identifier "trackpoint-usb"
        MatchProduct "Lite-On Technology Corp. ThinkPad USB Keyboard with TrackPoint"
        Option "AccelerationProfile"  "2"
        Option "AccelerationNumerator" "25"
        Option "AccelerationDenominator" "10"
        Option "VertScrollDelta" "8"
        Option "HorizScrollDelta" "8"
EndSection

Note that HorizScrollDelta is set in this.

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https://bugs.launchpad.net/bugs/1439948

Title:
  Horizontal scrolling on Thinkpad USB Keyboard with Trackpoint

Status in xserver-xorg-input-evdev package in Ubuntu:
  Confirmed

Bug description:
  I have a Lenovo ThinkPad Compact USB Keyboard with TrackPoint - this
  is an external USB keyboard with integrated TrackPoint that is based
  on the keyboard from the Thinkpad X230/T430/T530.

  Lenovo part number is: 0B47190

  Vertical scrolling works fine out of the box on Ubuntu 14.04 (fully
  updated), but horizontal scrolling does not work.

  I have it connected to a Thinkpad X200, also with integrated
  Trackpoint, where horizontal works fine.

  If I run xev, vertical scrolling up / down outputs button 4 / 5 as
  expected, but horizontal scroll has no output.

  I have an open thread about it here: 
  http://ubuntuforums.org/showthread.php?t=2270926

  Here is an Amazon reviewer on Archlinux (likely more knowledgeable than me) with the same issue: 
  http://www.amazon.com/review/R2Z5HAU91QRW7S/ref=cm_cr_dp_cmt?ie=UTF8&ASIN=B00F3U4TQS&nodeID=541966&store=pc

  On a Windows machine horizontal scroll worked fine using the same
  device.

  gdi2k@x200:~$ lsb_release -rd
  Description:	Ubuntu 14.04.2 LTS
  Release:	14.04

  gdi2k@x200:~$ apt-cache policy xserver-xorg-input-evdev-lts-utopic
  xserver-xorg-input-evdev-lts-utopic:
    Installed: 1:2.9.0-1ubuntu2~trusty1
    Candidate: 1:2.9.0-1ubuntu2~trusty1
    Version table:
   *** 1:2.9.0-1ubuntu2~trusty1 0
          500 http://ph.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          100 /var/lib/dpkg/status

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