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[Bug 1104230] Re: DisplayPort 1.2 MST support is missing in the Intel driver



I tried your kernel + updated intel drivers with a MST Hub connected to
my Dell XPS 13 (Intel® HD graphics 5000).

Both monitors continued to be mirrors of each other, and I could not see
the two monitors in Ubuntu Display's settings or in xrandr.

Distributor ID: Ubuntu
Description:    Ubuntu 14.10
Release:        14.10
Codename:       utopic

Kernel: 3.16.0-23-generic

  Installed: 3.16.0-23.31hf73386v20141028b1
  Candidate: 3.16.0-23.31hf73386v20141028b1
  Version table:
 *** 3.16.0-23.31hf73386v20141028b1 0
        500 http://ppa.launchpad.net/dgadomski/linux-mst/ubuntu/ utopic/main amd

  Installed: 2:2.99.916+git20141016.6b98f162-0ubuntu0sarvatt
  Candidate: 2:2.99.916+git20141016.6b98f162-0ubuntu0sarvatt
  Version table:
 *** 2:2.99.916+git20141016.6b98f162-0ubuntu0sarvatt 0
        500 http://ppa.launchpad.net/xorg-edgers/ppa/ubuntu/ utopic/main amd64 Packages

I am very time constrained at the moment so I was not able to build  David Airlie's branch to test.

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Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.

  DisplayPort 1.2 MST support is missing in the Intel driver

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

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

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