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


Hi Dariusz,

I have a Dell XPS 12-9Q33 and two U2414Hb Dell displays, all DP 1.2 MST 

Using your instructions, I installed the new kernel and intel driver.

Daisy chaining the two displays to my laptop DOES NOT work. With this 
kernel no external display works anymore.

Moreover, my wireless network controller is now no longer working. Even 
though it's listed in lspci as a 'Network controller: Intel Corporation 
Wireless 7260 (rev 6b)', rfkill list shows nothing.

Also, the touchscreen of my laptop stopped working with this kernel. 
It's no longer in the output of xinput list, which should show 
'ATML1000:00 03EB:842F'.

Lastly, my brightness keys don't work anymore.

When I reboot with official kernel 3.13, everything works again. Of 
course, except for MST.

Can you perhaps explain what's going on?

Kind regards,


Op 20-10-14 om 17:02 schreef Dariusz Gadomski:
> Hi Elvis,
> Looks like you have the perfect setup to test this case.
> Please make sure you have ppa-purge installed so you can revert the
> package updates if anything goes wrong.
> Please follow these steps:
> 1. sudo add-apt-repository -y ppa:dgadomski/linux-mst
> 2. sudo add-apt-repository -y ppa:xorg-edgers/ppa
> 3. sudo apt-get update
> Make sure that the output of:
> 4. apt-cache policy linux-image-3.16.0-19-generic
> states
> Candidate: 3.16.0-19.26~14.04hf71858v20141008b1
> 5. sudo apt-get install linux-image-3.16.0-19-generic
> 6. reboot to use the new kernel
> 7. sudo apt-get install  xserver-xorg-video-intel
> 8. reboot to use the new intel driver
> Assuming that you are connected to Monitor #1 and it is daisy-chained to
> Monitor #2 you should see 2 monitors available in the Ubuntu display
> settings panel.
> I would appreciate your feedback.
> Thanks,
> Dariusz

Wouter van der Graaf
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You received this bug notification because you are a member of Desktop
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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