Multi-touch not working using mtdev packages in Qt for embedded linux

[sachintm]

Hi,

I am following the steps specified in the mtdev installation guide for enabling multi-touch support for Embedded Qt "LINK":http://www.ptrackapp.com/apclassys-notes/embedded-linux-multitouch/

When I run the pinchzoom example provided in the qTUIO/examples on my device, I am getting only QEvent::TouchBegin and QEvent::TouchEnd, but not getting QEvent::TouchUpdate. The multi-touch events are received as multiple touch events with only QEvent::TouchBegin/TouchEnd.

After some debugging I found that, qTUIO is not getting the calls to QTuio::updateTuioCursor() function, which is responsible for sending the QEvent::TouchUpdate event to Qt framework.

How do I fix this issue ?

Device details:
ARM compiler
Qt 4.8.5 for embedded linux
mtdev, tslib libraries

Thanks and Regards,
Sachin