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I just installed elementary OS 5.1.5 Hera on my mac mini (mid-2011). However, I am not getting any video output on my HDMI out port. Only the DP output works. Here is the output of xrandr:

Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 8192 x 8192
VGA-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 526mm x 296mm
   2560x1440     59.95*+
   1920x1200     59.88  
   2048x1080     60.00    24.00  
   1920x1080     60.00    50.00    59.94    24.00    23.98  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.95  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
HDMI-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)

Here is the output of lspci | grep -i graph

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

I have tried plugging in/out the HDMI cable. It does not work. Both displays work fine when I run macOS or Windows.

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