I have an HDMI display. On a machine with nVidia graphics, I can simply use it as a display -- it's HDMI, it's digital, it's 1920x1080, EVERYTHING IS OKAY. On my MacBook Air, though, there is an underscan slider. This slider ranges from "off" (everything is scaled up to nocitably larger than the physical display size, and gets cut off) to "more" (everything is scaled into the middle of the display, with black borders). There is no setting for "it is a digital display, how about you try displaying 1920x1080 on it and not making this harder than it needs to be?" MacBook Air is from January of this year, HD Graphics 3000. FWIW, with Windows machines I have the same problem on all AMD/ATI cards, but nVidia cards have the option of disabling the behavior, whereupon everything looks fine, and a pixel is a pixel.