Thinkpad Trackpoint on Debian Wheezy

After install Debian Wheezy, Thinkpad X61 trackpoint can not scroll well.
Add a device configuration about trackpoint in X.org.

Step:
1. Create a directory under /etc/X11
    >> mkdir /etc/X11/xorg.conf.d
2. Create configuration
    >> touch /etc/X11/xorg.conf.d/20-thinkpad.conf
3. Add description for Trackpoint device
    /etc/X11/xorg.conf.d/20-thinkpad.conf
    

    Section "InputClass"
      Identifier "Trackpoint Wheel Emulation"

      MatchProduct "TPPS/2 IBM TrackPoint|DualPoint Stick|Synaptics Inc. Composite TouchPad / TrackPoint|ThinkPad USB Keyboard with TrackPoint|USB Trackpoint pointing device"

      MatchDevicePath "/dev/input/event*"

      Option "EmulateWheel" "true"

      Option "EmulateWheelButton" "2"

      Option "Emulate3Buttons" "false"

      Option "XAxisMapping" "6 7"

      Option "YAxisMapping" "4 5"

     EndSection

Reference:

  1. InstallingDebianOnThinkpadTrackpoint