Ubuntu
xorg-server package

  1. Trusty (14.04)
  2. Bug #1307701
  3. Comment #10

Comment 10 for bug 1307701

Revision history for this message
Stephen M. Webb (bregma) wrote : Re: Unity does not get touch events when QML apps running

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.