Delay in grabbing keyboard events in qwsserver (Qt Embedded Linux)

Hi all ,

I have developed a sample Qt application to detect the keyboard events.It works fine in PC.But when i run this application in embedded Linux arm Processor ,there is some delay in grabbing keyboard events..The application responds only when there is continuous key press.For a single key press it not responding.Also Led light in USB keyboard is also getting delayed when we toggle caps lock button after Loading this qt application.Some times it works fine ,when we restart the application.There is no problem with Keyboard it works fine i have tested same the with my PC.
I think there is issue with qwsserver..i have done following things for keyboard support

1)Run the configure script to support keyboard
2)Also Export environment variable QWS_KEYBOARD

Please help me to solve this issue

thanks