Public bug reported:

Horizontal scrolling with the middle trackpoint button on Thinkpad X260 does 
not work as expected. 
I noticed the problem in nedit, where holding the middle button while dragging 
the cursor over the text to be copied is a fast way of copying text.  But the 
cursor does not move, so this feature does not work. In chromium, scrolling 
works with the cursor in place, but this is not the same functionality as with 
a real mouse, which is what is supposed to be emulated.  This all worked 
perfectly in Ubuntu 10.10 (what I have been using until now).  

The difference between scrolling with the middle button of a real mouse and the 
broken emulation
is that with a real mouse, xev sees a ButtonPress event (button 2) followed by 
MotionNotify events, followed by a ButtonRelease event, whereas with the 
trackpoint it sees a series of ButtonPress and ButtonRelease events (buttons 
4,5,6,7) with no MotionNotify events.  Completely different behavior from what 
an application is expecting.   Since this worked in a previous release, is 
there some 
work-around?

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

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https://bugs.launchpad.net/bugs/1597984

Title:
  horizontal scrolling with middle trackpoint button broken

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

Bug description:
  Horizontal scrolling with the middle trackpoint button on Thinkpad X260 does 
not work as expected. 
  I noticed the problem in nedit, where holding the middle button while 
dragging the cursor over the text to be copied is a fast way of copying text.  
But the cursor does not move, so this feature does not work. In chromium, 
scrolling works with the cursor in place, but this is not the same 
functionality as with a real mouse, which is what is supposed to be emulated.  
This all worked perfectly in Ubuntu 10.10 (what I have been using until now).  

  The difference between scrolling with the middle button of a real mouse and 
the broken emulation
  is that with a real mouse, xev sees a ButtonPress event (button 2) followed 
by MotionNotify events, followed by a ButtonRelease event, whereas with the 
trackpoint it sees a series of ButtonPress and ButtonRelease events (buttons 
4,5,6,7) with no MotionNotify events.  Completely different behavior from what 
an application is expecting.   Since this worked in a previous release, is 
there some 
  work-around?

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https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-input-evdev/+bug/1597984/+subscriptions

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