Would that be the HL-R5678W? Hoo-boy, that user manual has a few rough spots in its english translation. I found a few references to 1080p on page 141, but they are really not clear. It does appear to accept 1080p, but it says "To view TV in the best visual quality of 1080p, connect to a PC whose graphic output is WUXGA (1920 x 1080)." That makes me wonder if it will only accept 1080p via the VGA input, with other inputs (component and HDMI) limited to 1080i. It's weird, but the way a lot of early 1080p displays handled inputs was weird.