[Bug 71267] sna: (Haswell) X-server freezes when enabling DP at docking station

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71267

--- Comment #163 from Martin <ms at sky-watch.dk> ---
So, to my understanding MST is not supported meaning that multiple (DP)
connected monitors will become mirrored. However, it seems like also the DVI
output is mirrored - is this expected? 

I am running Ubuntu 14.04 (i.e. 3.13.0-24-generic) on a T440p attached to an
ultra dock (firmware 2.17), and attaching one DP monitor works flawlessly
together with the builtin display. However attaching an additional monitor
(occurs for both DP and DVI) simply mirrors the first DP connected display.
xrandr outputs the same in either case:

martin at martin-ThinkPad-T440p:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected (normal left inverted right x axis y axis)
   1600x900       60.0 +
   1440x900       59.9  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis)
518mm x 324mm
   1920x1200      60.0*+
   3840x1200      60.0  
   2560x1024      60.0  
   1920x1080      60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x800       59.8  
   1280x720       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  
   720x400        70.1  
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

I would expect the DVI port to be working independently of the DP port - is
this  not the case?

thanks,
Martin

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