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[Dariusz Gadomski <1104230@xxxxxxxxxxxxxxxxxx>]

Hi Vincent,

If I understand correctly your docking station performs the role of a dp
mst hub (can you please confirm this with the documentation of your
docking station or provide its model to verify this online?), so it
should be a good setup to test.

Ideally to make this working you would need 2 things:
1. Patched kernel (I am hoping the one from my ppa is sufficient)
2. MST-aware intel driver (available from the xorg-edgers repository).

Can you please confirm that both conditions are satisfied in your test
case?

Thanks,
Dariusz

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https://bugs.launchpad.net/bugs/1104230

Title:
  DisplayPort 1.2 MST support is missing in the Intel driver

Status in X.org xf86-video-intel:
  Unknown
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Confirmed

Bug description:
  I have two recent DisplayPort monitors, both supporting the 1.2
  version of the standard and one containing an MST hub (DELL 2913WM).

  I have an Intel Haswell based NUC connected over mini-displayport to
  the display containing the hub, then the second display is plugged in
  that one over DisplayPort.

  DisplayPort 1.2 is enabled on the display containing the hub and the
  second display lights up fine but just works as a clone of the first
  display, without ever showing up in xrandr, dmesg or any other useful
  logs I could find.

  My understanding of MST is that the second display should show up as
  DP2 on my laptop so I can configure it as I would any other display.

  UPDATE: Updated the bug report after it was pointed out that the
  original test hardware, a Lenovo x230 isn't DP 1.2 capable. The same
  test on hardware also fails, due to missing support for MST in the
  driver.

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