The HDMI cable solved a lot of problems. It removed the need for a number of cables, making cable management a cakewalk. There are now versions of this cable, each iteration better than the last. This is where the confusion comes in. Last week, at CES, you saw a lot of display manufacturers talk about innovations in display technology and how this year’s modular TVs are going to be everywhere. But it is not yet as simple as bringing home a TV and playing high-resolution content on it. Even if you have the right cable for it, not all content...