I had a similar issue and yes:

sudo apt-get remove xserver-xorg-input-wacom

changes the behaviour.  Previously, Settings>Input Devices>Trackpad
showed no devices.  Now, it shows my Wacom CTT-460.  Also, mtdev-test
still fails as above but geisttest seems to show the device working with
pinches.  (geisview fails because gtk is not installed.)

Other sources say that the kernel module named "wacom",  a *driver*,  is
distinct from the *Xorg input driver* named "xserver-xorg-input-wacom."
Also, the kernel module named "evdev" is distinct from the Xorg input
driver named similarly.  I don't understand the difference, but
/var/log/dmesg still shows a "wacom" driver being used for my device.

I am running kubuntu 12.4b.

My best guess it is an architectural issue: client vs server.  I recall
that Ubuntu is moving multitouch and gesture recognition to the client
side (the windowing system and application, more or less) from the
server side (Xorg, the X11 server.)  IOW the Xorg input driver named
evdev passes raw multitouch events on to the client (Qt) instead of
interpreting them???

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https://bugs.launchpad.net/bugs/901630

Title:
  multitouch + qt doesn't work (eg fingerpaint demo) with wacom serial
  touchscreen

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