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[Vincent Gerris <1104230@xxxxxxxxxxxxxxxxxx>]

Hi Dariusz,

I have a Dell E7440 laptop with a docking station with at the moment 2 monitors attached.
1 is using VGA, 1 DVI, but now they are mirrored again.
With the patched kernel I had, I had multiple monitors visible.
With my own kernel, they worked, with yours they just showed the screens but gave no signal.
As far as I understand, this hub support (for MST?) makes sure not 1 but 2 screens are identified.
I still do not understand which parts (kernel, xorg, videodriver) are needed to get it working.
When I have some spare time I will look in to it further.
I cannot afford to bork it, because I work on this machine :).

Greetings Vincent

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1104230

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

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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