This is an almost verbatim repost of an earlier report here
The problem I am experiencing is with 12.10 running nVidia drivers. I tried 304 and 310 both with the same result, blurry text and screen. Previously I successfully used 304 and 310 drivers without any blurryness problem.
However, as of 2 days ago, all text and graphics are blurred. The appearance is similar to using a poorly calibrated VGA monitor. I am using DVI and this problem just appeared - I never had this happen before.
Everything on the screen is rendered like this. Working in DraftSight is almost impossible as fine lines are no longer visible.
I tried fixing the fonts and sub pixel rendering, but that did not help and since the graphics are also fuzzy I think that the problem lies with drivers, or as the previous poster suggested OpenGL something...