Originally Posted by Apple v. Samsung
Apple just put a damn hdmi on your computer its getting old now.
DP is royalty-free. DP supports USB and ethernet. DP is a VESA standard to replace VGA and DVI.
HDMI is more common because it was first to market. HDMI was designed to replace s-video and component video.
The main problem with HDMI is incompatibility between versions. DP has always just worked with previous digital equipment. The HDMI standard also fails to explain what are the maximum cable lengths at what resolutions, which DP does. Not a problem for most, but it means getting HDMI to work is a trial-and-error experience. This was especially problematic with the first HDMI devices (remember the PS3? blu-ray fiasco?)
Video card manufacturers want DP to succeed, but due to everybody wanting HDMI ports, that's what they're offering. It's another first-to-market problem. VESA kinda dropped the ball, and Apple joined far too late to be a player.