Per the Thunderbolt FAQ [1]

> What is Thunderbolt 3?

> Computer ports with Thunderbolt 3 provide 40Gbps Thunderbolt – double the speed of the previous generation, USB 3.1 10Gbps, and DisplayPort 1.2.

I'm curious: which active cable did you use that didn't support DP?

[1] https://thunderbolttechnology.net/tech/faq

What you quote is not related at all to what Thunderbolt cables support beside Thunderbolt. It just states that you can use Thunderbolt to transmit DisplayPort signals. By that you're utilizing the Thunderbolt alternate mode to tunnel DisplayPort signals, instead of using the DisplayPort alternate mode [1]. Using Thunderbolt to transmit DisplayPort signals only works with devices which support Thunderbolt, not with screens supporting "just" DisplayPort. To make confusion even worse: All existing Thunderbolt controllers also support the DisplayPort alternate mode, so a lot of people who believe they're using Thunderbolt are probably just using the DisplayPort alternate mode instead. Afaik Thunderbolt cables usually support both, but I'm not sure if that's mandated somehow.

[1] https://en.wikipedia.org/wiki/USB-C#Alternate_Mode_partner_s...

Thanks for the clarification.

What a clusterfuck of a standard.

Note: This cable does not support native DisplayPort 1.2 or Thunderbolt 3 connections to a DisplayPort monitor. https://amazon.com/StarTech-com-Thunderbolt-Cable-40Gbps-Cha...

Regular USB-C monitor is not support, USB 3.1/3.0/2.0 and USB-C is not support https://amazon.com/Thunderbolt-Certified-Nekteck-Compatible-...

USB 2.0 ️[check], USB 3.0 [ ], DisplayPort [ ] https://amazon.com/Belkin-Thunderbolt-Cable-Feet-Meters/dp/B...

Can you point me to any 2-meter thunderbolt@40GHz cable that does support USB 3 and/or DisplayPort? None of the ones in this chart can do it: https://docs.google.com/spreadsheets/d/1vnpEXfo2HCGADdd9G2x9... Only the 1-meter active cable can.

Well shit, I stand corrected. Thanks for the links!