How did you get 1600x1200 working? Could you please list the exact timings (pixel clock etc.) so I can try them? I already tried with the specs of my TFT to no avail.
Well, I did not really do anything special...
I created the mode, changed the pixel clock till I had 60 Hz in the bottom right frequency field (pixel clock was then at 172.35) and that was it.
This only worked with the GeForce of course, as the Radeon was limited to 1280x1024.
I really wish this could be adressed. If I could just get the native resolution of my monitor (1920x1200) or at least another 16:10 aspect mode, I would be one happy puppy.