How to set underscan factor

[Daniel Klaffenbach]

Hi,

I have connected my TV via HDMI to my Radeon HD 3870. I am running the latest 
git versions of Linux 2.6 (with KMS), mesa, libdrm and xf86-video-ati.

Right now the image is either too small for the TV (black area around the 
image, underscan=on), or the image is too large for the TV (window decoration 
etc. missing, underscan=off).

For the reference, this is what I am talking about:

Image with underscan off: http://goo.gl/o8lP4
Image with underscan on: http://goo.gl/BuBVO

I experimented with the "underscan" parameter using xrandr, but there only 
seems to be "on" and "off". Is there any way to scale the image so it fits to 
the screen? The AMD Catalyst Control Center has a slider for this which works 
well, but I cannot find a corresponding option (underscan/scaling factor) for 
the OSS driver.

A while ago this was all working correctly (I needed to turn underscan off and 
the image would fit perfectly to the screen).


Regards,
Daniel
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