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The confusion is that most people don't understand how USB, TB2/3, and DP work (not saying they should either!). TB3 is an "alternate mode" signaling over USB-C. As such, every TB3 port is a USB-C port, but not every USB-C port is a TB3 port. Same goes for DisplayPort over TB2. Every TB2 "native" port allows DP, but not every DP port does TB2. TB3 doesn't however carry DP signaling as before though because a cable is either TB3 over USB-C, or DP over USB-C, not both. TB3 and DP both use the "same" alternate-mode signaling. This was my only complaint with the 12" rMB, having only one port, you couldn't plug in a hub, then hub to monitor, because the hub wouldn't kick in the alternate mode signaling required. This required the monitor to always be first device. Now with the rMBP having multiple ports, not a problem anymore. As mentioned before, USB-C also has an alternate mode for DisplayPort. That's how your LG 27UD88 (fantastic monitor btw!) gets the monitor signal. Buying a TB3 to TB2 adapter is the wrong way to adddress hooking up a DP monitor, despite it being a semi-logical conclusion for even most tech geeks. The right combo is to get a USB-C to DP adapter. I don't know what the USB-IF folks were thinking, but clearly we need some of whatever they were smoking as this is going to be a mess for years to come i bet. As to your last point about 60W vs 85W USB-PD, technically you are very correct, but in real life not exactly. The distinction comes to play with how hard you are working the machine. If CPU/GPU are maxed, you'll drain a little battery, but under normal load you'll see a very very slow charge. Same thing happened before with Magsafe2 when you used a 65W power cord on a 15" MBP (that normally used an 85W adapter). |