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

 

I tried again and used the intel installer after which I could only boot in fallback graphics mode with both your and my custom kernel.
Before I used the installer I could see the screens with your kernel, but there was no signal going to them.
No I do not know how to fix this and why it worked in the first place.
Fortunately the original 3.13 kernel still gives me a working desktop :).
Any clues?
Maybe some dkms stuff, not sure. It would be great if someone could explain exactly which components are responsible, then I can test in a more structured instead of hackish way :).
Thank you

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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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