There are numerous reports online about flaky behavior with Alternate Mode USB-C HDMI adapters, ranging from complete failure (as in my case) to connect to wakeup/power-down issues to plain old flakiness. On the other hand, this adapter did work with the Dell U2415 monitor. The monitor “knew” there was something happening but it remained black. Others, like the Dell S2715H at work, were detected by macOS but did not display an image. Some, like my Dell P2715Q, were not detected at all.
I purchased the Monoprice Select Series USB-C HDMI Multiport Adapter and found that it did not work with any monitor I have encountered.
Although it looks like this Dell S2715H is connected correctly, the screen was blank So I’m very disappointed to report that HDMI cannot be trusted to work with the new Late-2016 MacBook Pro. HDMI is also the new common denominator for those of us who travel and use projectors. HDMI is everywhere, since most inexpensive monitors are just repurposed TV’s. And don’t count on 87W USB-C pass-through charging working with any adapter. TL DR: Stick to DisplayPort, which works great, and do not buy a USB-C HDMI adapter (even Apple’s own Digital AV Multiport Adapter) unless you know it works. And my experience matches that of many others.
I picked out a set of cables and adapters for my 15″ MacBook Pro with Touch Bar and found that, although DisplayPort works flawlessly, HDMI was pretty flaky. This cheap $15 Monoprice adapter ought to extract native HDMI from the USB-C port, but it doesn’t workįirst, a bit of background: The “Thunderbolt 3” USB-C ports on the Late-2016 MacBook Pro computers support native “alternate mode” HDMI and DisplayPort video, in addition to USB 3.1 and Thunderbolt (PCIe) connections. I recommend sticking with DisplayPort until Apple resolves the issues. And although USB-C ought to support HDMI monitors just fine, I’ve found that it doesn’t work all that well with my 15″ MacBook Pro. The new MacBook Pro has USB-C ports for everything – power, I/O, and graphics.
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