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

 

Hi Dariusz,

Thank you very much for your quick reply.
I was about to do this, but what caught my surprise this morning, I rebooted and suddenly got mulit monitor support!
I am not sure why, I do not seem to use xserver-xorg-video-intel know, so not sure why it works now.
It might be because I used the intel installer before and there was a patch enabling my patched kernel to work.
I tried the original ubuntu kernel and with that it doesn't.
I am happy to be using it now (with one VGA, one DVI and the internal laptop screen, running my own compiled 3.14 kernel).
Thank you and let's hope Ubuntu will put those patches in the current kernel or in proposed or something.
cheers!

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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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