Created attachment 15808 [details] xorg.0.log When the resolution of the TMDS output is set to 1600x1200 (either by xrandr (--auto) or by the Xserver itself, no modelines supplied), my monitor recognizes the signal as 1600x1198 (!) and scales the output to 1600x1200, this is clearly visible.
Created attachment 15810 [details] xorg.conf
Looks similar to bug#15370. Is this a DVI interface?
Now I really thought that I had browsed through all relevant bug reports to avoid duplication, it appears I still skipped one :-( bug#15370 is indeed almost exactly the same, even on the same laptop :-/ *** This bug has been marked as a duplicate of bug 15370 ***
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