Not getting XIDeviceEvent data in X11EventFilter

Hi,
I'm having problems getting data for touch events redirected to my application window using X11EventFilter.
I've used

Code:

---

XISelectEvents(QX11Info::display(), viewer->winId(), &eventmask, 1);

---

to select Events for my window. In my X11Eventfilter function

Code:

---

bool MainApplication::x11EventFilter(XEvent *event)
{
 
    XEvent ev = *event;
    if (ev.xcookie.type == GenericEvent)
    {
        std::cout << "Extension" << ev.xcookie.extension;
        XIDeviceEvent* evData = (XIDeviceEvent*)(ev.xcookie.data);
        int id = 0;
        if(evData != 0){
            id = evData->detail;
            printf("Success\n");
        }else{
            printf("Device Event data not coming\n");
        }
        ....

---

everything seems to be in order except that `ev.XCookie.data` field is zero.
This is happening on Debian 8 OS, on Ubuntu the same code works fine.

Any Ideas on where I might be going wrong or if it has something to do with the OS?

Thanks.