Comment 73 for bug 1414930

mainline kernel 4.0.0-040000rc7-generic fixed trackpoint issues for me. (on Ubuntu 12.04 LTS)

Separate issue but I also use an external "Lenovo ThinkPad Compact USB Keyboard with TrackPoint" and middle scrolling did not work out-of-the-box . set-prop "Evdev Wheel Emulation Button" to 4 fixed this. The integrated keyboard was differently set to 2.

I did not directly set this but changed the MatchProduct in /usr/share/X11/xorg.conf.d/11-evdev-trackpoint.conf to be more specific "IBM TrackPoint|DualPoint Stick" and the non-matched Compact Trackpoint Keyboard fallback defaulted to "4" for EmulateWheelButton.