AMD Prepares Linux Driver Support For USB4 DP Tunneling

Written by Michael Larabel in Radeon on 4 October 2021 at 01:45 PM EDT. 17 Comments
The newest patch series by AMD open-source Linux graphics driver engineers worth mentioning is around USB4 DisplayPort tunneling support for next-generation AMD hardware supporting USB4 connectivity.

The USB4 specification allows for tunneling of DisplayPort 1.4 (as well as DisplayPort 2.0 Alternate Mode, but not the focus of today's patch work) and that is what this new AMDGPU driver work is about for handling DP over USB4 connections.

Right now AMD doesn't support USB4 by current-generation hardware but that is changing... There has been rumors of AMD Ryzen 6000 mobile "Rembrandt" processors supporting USB4. Indeed, with these patches one of them mentions "Yellow Carp" with that being the Linux codename for what is believed to be Rembrandt. So for next-generation AMD laptops there should be USB4 support available as expected.

AMD has been working on the Yellow Carp support openly since this summer and it's good to see them branching out on other improvements like now getting USB4 DisplayPort tunneling in place.

The initial USB4 DP tunneling bring-up for the AMDGPU kernel graphics driver is just under two thousand lines of code and for now is on the mailing list. We'll see if it's reviewed and ready in time for the 5.16 cycle.
Related News
About The Author
Michael Larabel

Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

Popular News This Week