I am affected by the bug without having upgraded from trusty to xenial.
I simply upgraded from kernel 3.13 to kernel 4.4 maintaining the Trusty
release.

After the kernel upgrade the touchpad of my Dell XPS 13 ( version 9333 -
2014 ) is no more recognized as a valid input source for the xserver.

It is useful to point out that I also own a newer Dell XPS 13 ( version
9350 -2016 ); the machine came with a more recent trusty version (
Ubuntu 14.04.5 LTS ). After upgrading from kernel 3.19 to kernel 4.4 the
touchpad is still working without a glitch.

I guess that something has gone wrong when upgrading the kernel in the
older machine.

I tried to install package xserver-xorg-input-synaptics with the
following result:

sudo apt-get install xserver-xorg-input-synaptics

The following packages have unmet dependencies.
 xserver-xorg-input-synaptics : Depends: xorg-input-abi-20
                                Depends: xserver-xorg-core (>= 2:1.14.99.902)
E: Unable to correct problems, you have held broken packages.

It is likely that the actual origin of the bug lies in the above
mentioned broken packages ...

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1629613

Title:
  [Dell XPS 13] SynPS/2 Synaptics TouchPad not recognized after upgrade
  from 14.04 to 16.04

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  * Touchpad doesn't work at all (No response from the Touchpad)
  * Tried using external mouse and it works fine
  * Cannot find "SynPS/2 Synaptics TouchPad" in "cat /proc/bus/input/devices"

  
  OS:           Ubuntu 16.04.1 LTS
  kernel version: 4.4.0-38-generic
  Laptop Model:   Dell XPS 13 - 93333

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