Touch screen wrong coordinates on touch

[Talei]

Hello,
I have a problem with touch coordinates for the QEvent::TouchBegin (QEvent::TouchEnd and Update is ok) I.e.:

const QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(e)->touchPoints();
            touchPoints.first().pos().x // <- == 0

const QList<QTouchEvent::TouchPoint> touchPoints = static_cast<QTouchEvent *>(e)->touchPoints();
            touchPoints.first().pos().x // <- == 0

To copy to clipboard, switch view to plain text mode 

give X always 0, Y is ok.

Any one knows the reason?