I am curious as to exactly what USB Type-C alternate modes (and variations of those modes) are supported on the 15" 2016 MacBook Pro and later. 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.

  • 3
    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
  • 3
    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
  • I'd be curious to get an answer to this, along with any enhancements that may have happened with 16" Late 2019 MacBook Pro. – Nimesh Neema Dec 10 '19 at 4:28

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