AMD Ryzen 7 6800U cannot output via USB4
Brief summary of the problem:
Plug an TBT monitor to USB4 port via TBT cable, no image on the monitor.
It's TBT monitor <-> USB4 port, nothing in the middle.
The setup works under Windows./
Hardware description:
- CPU: AMD Ryzen 7 6800U
- GPU: 63:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt [Radeon 680M] [1002:1681] (rev c4)
- System Memory: 32G
- Display(s): eDP, and TBT monitor
- Type of Display Connection: TBT
System information:
- Distro name and Version: Ubuntu Kinetic Kudu
- Custom kernel: AMD's drm-next branch, top commit eec53143b7fe1ccaace434e03b5959c9117bf9c5 "drm/amd/display: fix incorrect comparison in DML"
How to reproduce the issue:
In the summary.