My T440s /etc/X11/xorg.conf.d/99-synaptics-thinkpad-t440s.conf

99-synaptics-thinkpad-t440s.conf

# From: https://raw.github.com/ScottGarman/thinkpad_t440s/master/99-synaptics-t440s.conf
# and: http://major.io/2013/08/24/get-a-rock-solid-linux-touchpad-configuration-for-the-lenovo-x1-carbon/
# Custom xorg.conf.d snippet that assigns the touchpad driver
# to all touchpads. See xorg.conf.d(5) for more information on
# InputClass.
# Additional options may be added in the form of
#   Option "OptionName" "value"
#
Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
# This option is recommend on all Linux systems using evdev, but cannot be
# enabled by default. See the following link for details:
# http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
      MatchDevicePath "/dev/input/event*"

      # This sets the top area of the touchpad to not track
      # movement but can be used for left/middle/right clicks
      Option "SoftButtonAreas" "60% 0 0 2600 40% 60% 0 2600"
      Option "AreaTopEdge" "2600"

      # Corresponds to "Synaptics Noise Cancellation"
      Option "HorizHysteresis" "40"
      Option "VertHysteresis" "40"

      # Disable edge scrolling, I prefer two-finger scroll instead
      Option "VertEdgeScroll" "0"

      # Enable three-finger tap for middle mouse click
      Option "TapButton3" "2"

      # "natural" vertical and horizontal scrolling
      Option "VertTwoFingerScroll" "1"
      Option "HorizTwoFingerScroll" "1"
      Option "VertScrollDelta" "-75"
      Option "HorizScrollDelta" "-75"
EndSection