How to make HTPC display fit on a HDTV screen

[pochartrand]

I have a Panasonic PZ800 plasma tv (1080p) and recently built a HTPC plugged on that tv. The problem I have is that i can't seem to make the display fit properly on the tv. Even after setting the resolution to 1920x1080, i am stuck with black "padding" around the picture. I looked in the tv manual but found nothing.

What am i doing wrong ?

thanks

 

[pochartrand]

Nevermind, just found it. Underscan feature in catalyst control center; which was not very intuitive to find...

 

[Katsushiro]

I would like to maim whoever at ATI decided to make that the default setting. I don't even understand why someone would ever want that to be a feature.