Problem with ati driver at 2560x1600

[Wil Reichert]

Seems I'm getting some wierd issue where both text and graphics (i.e.
fonts, window decorations, etc) are pixelated & blocky at 2560x1600.
Drpoping the resolution to 1920x1200 makes everything fine.  I've
tried both 6.12.2 and git master of xf86-video-ati, both have the same
issue.    Tried various windows managers, all have the same problem.
I got a screenshot via gimp to show the problem, but it looked fine.
Attached is my x log.

Wil
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