I work a lot in Windows XP SP3 on my Air. Now I've noticed that sometimes my screen displays black letters a bit blurry, not so sharp. at other times it is completely sharp. This does not change with changing brightness. It does change: -at night. it looks better -it got better after installing Inputremapper. Unfortunately that app is a bit buggy in my experience. It also installs 4 drivers that are always running. -it changes back and forth after connecting the Air to my HDTV. So I am guessing this has something to do with the light sensors. Correct? Where are these sensors located? And is there another way to change the setting in XP?