I am curious exactly what USB Type-C alternate modes (and variations of those modes) are supported on the MacBook Pro (15-inch, 2016). I've done some searching on the internet, but I've been unable to find any credible source of information on the subject. I would consider a credible source of information to be:

  • Official Apple technical documentation explicitly describing all supported USB Type-C alternate modes which are supported on the device. (All I've found so far is marketing info, which isn't specific enough)
  • Analysis of USB PD traffic which might indicate supported alternate modes and capabilities.
  • Some sort of command-line utility or tool which is able to dump this information.

I already know that the USB Type-C ports on this machine support the following alternate mode configurations:

  • 4 lanes using Thunderbolt 3.0
  • 4 lanes using DisplayPort 1.2
  • 2 lanes using DisplayPort 1.2 and 2 lanes using USB 3.1

But I'm pretty sure it supports additional variations.

  • 2
    Apple is notoriously closed. You probably need a developer account to even begin to delve into their systems on such a technical level. Furthermore SIP has made it more difficult to spy on the kernel. – Hefewe1zen May 27 '17 at 18:11
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    Great question darco - someone could surely reverse engineer the PD spec and/or analyze things. Let's hope they published the results. I would expect that the supported modes will change over time based on firmware updates and OS updates, so you might have a moving target and need to ask some more narrow questions about if a specific accessory works if we don't get a wikipedia like summary of all the tested functions available. – bmike Jul 14 '18 at 17:07

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