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I have an Intel? NUC Kit NUC8i7BEH with an Elgato Thunderbolt 3 Mini Dock and I can't make it work with three simultaneous displays. The NUC says it supports three displays and the dock says that it supports two at the same time using a DisplayPort and an HDMI port.

I can only use two displays at the same time, the integrated HDMI of the NUC and only one of the ports of the dock, when I unplug one display from the dock the other becomes active instantaneously.

I am using Ubuntu 18.04.3 LTS with Linux 5.0.0-32-generic and the latests Intel BIOS.

The ThunderBolt device is active and in insecure/legacy mode on the BIOS (Dock's USB port works OK):


Code:
> sudo boltctl list
    ● Elgato Systems Thunderbolt 3 Mini Dock
      ├─ type:          peripheral
      ├─ name:          Thunderbolt 3 Mini Dock
      ├─ vendor:        Elgato Systems
      ├─ uuid:          99999999-9999-9999-ffff-ffffffffffff
      ├─ status:        authorized
      │  ├─ domain:    domain0
      │  └─ authflags:  none
      ├─ authorized:    Mon 01 Jan 2019 02:47:00 AM UTC
      ├─ connected:    Mon 01 Jan 2019 02:47:00 AM UTC
      └─ stored:        Mon 01 Jan 2019 07:34:26 PM UTC
          ├─ policy:    manual
          └─ key:        no
Xrandr has the same output with or without the dock plugged and output DP-2 is always the active display that is connected to the dock, even if it is using the HDMI port:


Code:
> xrandr
    Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 8192 x 8192
    DP-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis) 582mm x 364mm
      1920x1200    59.95*+
      1600x1200    60.00 
      1280x1024    75.02    60.02 
      1152x864      75.00 
      1024x768      75.03    60.00 
      800x600      75.00    60.32 
      640x480      75.00    59.94 
      720x400      70.08 
    DP-2 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 509mm x 286mm
      1920x1080    60.00*+
      1600x900      60.00 
      1280x1024    75.02    60.02 
      1152x864      75.00 
      1024x768      75.03    60.00 
      800x600      75.00    60.32 
      640x480      75.00    59.94 
      720x400      70.08 
    HDMI-1 disconnected (normal left inverted right x axis y axis)
Please any hint, advice is welcomed, I searched everywhere but I can't make it work.

Thanks!!!
11-07-2019, 04:27 AM
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