The problem does not occur in a Gnome Flashback (Compiz) session, so it
is evidently a result of the interaction between the XInput2 touch grabs
used in Unity 7 (through Geis), the passive Xinput touch subscriptions
in Qt, and the pointer emulation in x.org.
Multi-touch pointer emulation in XInput2 is documented as acting the way
as described in this bug when multi-touch sequences are neither accepted
nor rejected (ie pointer emulation stops when the first touch ends - see
http://who-t.blogspot.ca/2011/12/multitouch-in-x-pointer-emulation.html)
although it is unclear why the emulation does not resume when all
touches have stopped.

It sounds like the Unity touch support needs to add gesture
accept/reject.

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https://bugs.launchpad.net/bugs/1307701

Title:
  Unity does not get touch events when QML apps running

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