Hi,
Their is a workaround, it is to remove and install psmouse driver, please open 
your Terminal(Ctrl+Alt+T) and run:

sudo rmmod psmouse
sudo insmod /lib/modules/`uname -r`/kernel/drivers/input/mouse/psmouse.ko

Did that work for you?

** Package changed: xserver-xorg-input-synaptics (Ubuntu) => linux
(Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Low => High

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/978807

Title:
   'Cypress Trackpad' incorrectly detected as 'ImPS/2 Generic Wheel
  Mouse' in 'Dell XPS 13 Ultrabook''

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