I am trying to use swipe gesture with my application by using Qt 5.4. But I am facing with some problems.
Sample gesture application(fingerpaint, knob, etc..) working fine with Qt 4.8 but whenever I compile exactly same cource code with Qt 5.4 gesture feature stop working. I don't know why this is happining.

Note :
Touch screen (Multi-touch) is connected my laptop (Ubuntu 14.04) with HDMI and USB (External)