Where can I find working "modelines" for Radeon 8500?

I have a 
   radeonfb: ATI Radeon 8500 QL DDR SGRAM 64 MB

I am interested in 1024x768 and 1152x864. I have tried the defaults
that come with Debian fbset (2.1-8) but I get garbled screen upon
changing the video mode. I can 'clear' the console and work more or
less normally but the viewport will be just a part of the whole
screen.

Try using stty. I see most people will continue to use fbset so I guess I 
need to patch it up to do the right thing.




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