I have a wacom build-into my fusitsu t-900.
I also have experienced the loss of finger input when upgrading to Xenial.
However the issue was not the kernel itself, but the fact that on the previous 
version of ubuntu (15.10) I had to run from my /etc/rc.local:

/usr/bin/inputattach --always -w8001 /dev/ttyS4

In order for the wacom to work.
Now this actually is messing things up. Now It just works without the 
inputattach thing.

Can you reproduce the bug on a brand new (live dvd) installation?

my xinput without the inputattach running.

$ xinput
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PS/2 Generic Mouse                        id=14   [slave  pointer  (2)]
⎜   ↳ SynPS/2 Synaptics TouchPad                id=15   [slave  pointer  (2)]
⎜   ↳ Serial Wacom Tablet FUJ02e7 stylus        id=16   [slave  pointer  (2)]
⎜   ↳ Serial Wacom Tablet FUJ02e7 eraser        id=17   [slave  pointer  (2)]
⎜   ↳ Serial Wacom Tablet FUJ02e7 touch         id=18   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Fujitsu FUJ02E3                           id=7    [slave  keyboard (3)]
    ↳ Video Bus                                 id=8    [slave  keyboard (3)]
    ↳ Fujitsu FUJ02B1                           id=9    [slave  keyboard (3)]
    ↳ Fujitsu FUJ02BF                           id=10   [slave  keyboard (3)]
    ↳ Power Button                              id=11   [slave  keyboard (3)]
    ↳ CNF8248                                   id=12   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=13   [slave  keyboard (3)]

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https://bugs.launchpad.net/bugs/1613134

Title:
  wacom touch screen does not recognize finger touch

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