[Bug 90501] New: DP MST not working as expected

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90501

            Bug ID: 90501
           Summary: DP MST not working as expected
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.19 rc2
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: stephan.schultchen at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

I am running a Dell XPS 13 which is connected to a Club3D CSV 5300 DP hub,
which is connected to two DELL Display via DP.

The Problem is that the two displays are recognized as one big display. The
same hub + displays connected to a Nvidia 660 Ti is recognized as zwo seperate
displays.

The second problem is that when connected to the Dell XPS everything displayed
on the upper left of the left screen is "shaking" and vertical lines are
popping up & disapearing. Here is a video:

https://drive.google.com/file/d/0B7B7mko4lq6cUmxmaU5BYVY3b2M/view


Here is a the output of xrandr from my Dell XPS 13 with the attached DP hub and
displays. With the hub connected to my Nvidia, i see two displays that have
been identified as DP1.1 and DP1.2

schlitzer at schlitzer-XPS-L322X:~$ xrandr
Screen 0: minimum 8 x 8, current 5760 x 1200, maximum 32767 x 32767
eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 294mm x
165mm
   1920x1080      60.0*+   59.9     40.0 
   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 
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 connected 3840x1200+1920+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 
   1280x960       60.0 
   1024x768       60.0 
   800x600        60.3 
   640x480        60.0 
   720x400        70.1 
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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