Ubuntu
xserver-xorg-input-evdev package

  1. Bug #1246683
  2. Comment #80

Comment 80 for bug 1246683

Revision history for this message
Dominik Gierlach (dominik-gierlach) wrote : Re: Middle button does not work for scrolling

@William:
Thanks for the info!

I read into it. Fedora 22 uses libinput as input stack:
https://fedoraproject.org/wiki/Changes/LibinputForXorg

Among the benefits:
middle top software button can be used to emulate wheel events on the trackstick (on the Lenovo *40 series and related touchpads)