Dock Compatibility: Plugable TBT4-UD5 (Thunderbolt 4)

Plugable TBT4-UD5 Dock


  • USB-C PD
  • USB-A downstream ports
  • USB-C downstream ports
  • RTL8153 USB Ethernet (2.5GbaseT)
  • HDMI port 1 (only when connected to port 2 on FW16; does not work properly when connected to port 1 on FW16)

Tested with:

  • Debian Testing (kernel 6.7.12-1, amdgpu firmware 20240410, KDE Plasma 5)
  • Ubuntu 24.04 (kernel and firmware as provided in installer, KDE Plasma 5)
  • LG 34UC88-B display
  • LG 27UK500 display

HDMI behavior when connected to FW16 port 1 (USB4/TB4) is quite strange (and both displays work fine when connected directly to FW16 using an HDMI expansion card) - sometimes the display will be detected, but with only 640x480 resolution available; other times the laptop locks up and has to be power cycled when the display is attached to the dock. The display works fine when connected to FW16 port 2 (USB3.2).

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If you can reproduce using the latest kernel (6.9-rc7) please post a bug to Issues · drm / amd · GitLab with logs and more details.

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Just updated the post: I’m not sure why I didn’t test this before, but the display works fine when connected to port 2 on the FW16.