[expert] KwinTV @ Full Screen - How?

[Sevatio Octavio]

LM7.2 was installed and my Hauppauge wintv BT848 worked right away.  But 
when I go into "full-screen" mode, it does not fill the screen.  Instead, 
there is a large black border.  How can one get KwinTv to completely fill 
the screen?

Seve