[Bug 83600] [HSW] HDMI monitor does not work via active DisplayPort adapter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83600

--- Comment #29 from Chris Cheney <chris.cheney at gmail.com> ---
Looking closely at my dmesg output it appears that when xrandr probes (eg
running vlc) the driver disables the non-existant (on my system) HDMI-A-3 which
is likely using HDMI-D DDC GPIO pins and it ends up disabling my DisplayPort
connector. On my system the DisplayPort connecter in the VBT is EFP3
DisplayPort D using the HDMI-D DDC GPIO Pins.

I'm guessing the fix would involve not exporting non-existant devices from the
kernel/xorg driver?

My system has physically: 2 HDMI and 1 DP.

--

I didn't have the DP plugged in at the moment when this was run:

$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 510mm x 290mm
   1920x1080     60.00*+  50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1280x1024     60.02  
   1280x960      60.00  
   1152x864      59.97  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI2 connected 1920x1080+1920+0 (normal left inverted right x axis y axis)
510mm x 290mm
   1920x1080     60.00*+  50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.88  
   1280x1024     60.02  
   1280x960      60.00  
   1152x864      59.97  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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