Video connectors on the Librem mini

Hardware
1

I received my Librem mini yesterday. Installation went very smoothly, all is working fine, but I’m perplexed by the xrandr output. I currently have the mini connected to my screen over HDMI and xrandr tells me:

Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 16384 x 16384
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 546mm x 352mm
   1920x1200     59.95*+
   1920x1080     60.00    50.00    59.94    59.99  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1366x768      59.79  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

This brings 2 questions:

  1. Why does xrandr say that my screen is connected to DP-2 while it’s connected to the HDMI port?
  2. What are all those other connectors about? The Librem mini only has two video connectors that I can see (one HDMI and one DP).
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2

  1. because internally the HDMI output is routed via one of the the GPU’s DP outputs, then to a DP->HDMI converter (a LSPCON) in order to offer HDMI 2.0, which the GPU doesn’t support natively

  2. xrandr is listing the internal GPU output ports, not the physical connectors on the board

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