[Bug 87319] [BDW] Dock with builtin DP/VGA "dongle" fails cycling through modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87319

--- Comment #20 from Gary Wang <gary.c.wang at intel.com> ---
I checked test result from customer, and they told me following test cases are
correct. For failed case, the DP1's status was disconnected and disabled.

Pass: drm DP-port (card0-DP-2) <-> Synaptic-DP-hub in docking <-> docking's DP
port <-> DP EFP
Pass: drm DP-port (card0-DP-2) <-> Synaptic-DP-hub in docking <-> docking's DP
port <-> external DP to VGA dongle <-> VGA EFP
Failed: drm DP-port (card0-DP-1) <-> Synaptic-DP-hub with built-in DP-to-VGA
converter in docking <-> docking's VGA port <-> VGA EFP

Before turn off external monitor by UI (or "xrandr --output DP1 --off"),
...
Screen 0: minimum 320 x 200, current 2944 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
309mm x 175mm
   1920x1080      60.0*+   59.9  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 connected 1024x768+1920+0 (normal left inverted right x axis y axis) 0mm x
0mm
   1024x768       60.0* 
   800x600        60.3     56.2  
   848x480        60.0  
   640x480        59.9  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
...
,
After turn off external monitor by UI,
...
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
309mm x 175mm
   1920x1080      60.0*+   59.9  
   1680x1050      60.0     59.9  
   1600x1024      60.2  
   1400x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
...

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