handling radeon overscan

[Matthew Monaco]

My monitor, ASUS VE248H, looks horrible when the overscan is on (or is it off? 
The image on the screen is too small.)

There is an option for Full / Overscan, however it doesn't seem to have any 
effect on the image (I really wish it did).

This is all on HDMI, over DVI it looks fine; I guess the monitor gives a 
different EDID per connection.

What are my options here?