[Bug 109340] HDMI output (DisplayPort-0) stops listing modes after using docking station DP output

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Comment # 3 on bug 109340 from
This problem also occurs when using drm/drm branch drm-next (5.0.0-rc1) with:
[PATCH v7 00/20] MST refcounting/atomic helpers cleanup
on top of it.

The only difference I've noticed is xrandr complaining about
MIT-MAGIC-COOKIE-1:
> xrandr 
Invalid MIT-MAGIC-COOKIE-1 keyxrandr: Output DisplayPort-0 is not disconnected
but has no modes
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
309mm x 174mm
   1920x1080     60.02*+  40.00  
   1680x1050     60.02  
   1280x1024     60.02  
   1440x900      60.02  
   1280x800      60.02  
   1280x720      60.02  
   1024x768      60.02  
   800x600       60.02  
   640x480       60.02  
DisplayPort-0 connected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
DisplayPort-3 disconnected (normal left inverted right x axis y axis)
DisplayPort-4 disconnected (normal left inverted right x axis y axis)
DisplayPort-5 disconnected (normal left inverted right x axis y axis)


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