[Bug 72795] [HSW dp mst] Dell dock DVI knocks out DP when unplugged.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72795

--- Comment #19 from Christer Folkesson <christer.folkesson at digpro.se> ---
(In reply to comment #1)
> Hmm, the dock only presents a DP link, so I guess it is acting as a MST hub.
The MST hub has to be in the laptop, for solving the problem it probably don't
matter.
There are two versions of the E-series dock. One having a VGA, DVI and DP
connector and the other (bigger) having VGA, 2x DVI/DP (marked as VIDEO 1 and
VIDEO 2, so you can only choose one connection at a time).

Similar to comment #12 we had a E6410 (~3 year old model) in the same dock
(also tried with new dock) and it worked okay, running some Ubuntu 11.04.
This leads me to believe that for the two digital outputs in the dock the Dell
E-series docking connector have two distinict DP "cables".
The E7440 ultrabook can, if you connect the displays to the onboard HDMI and
mini-DP connector use 3 screens at once (2 external and the built-in). My guess
they only could have one more "output" and made a DP MST hub for them
internally.





If you guys says it can't be fixed shortly I might suggest to other users with
Dell E7x40 laptops a workaround, that some guy on the internet had created
(doing a fake xinerama) I reposted and wrote about it in the Linux Mint forum
thread I created about this problem, but I myself didn't get it to work (and
someone in that thread posted to this bug report, that's how I found it).
See the link github from this post
http://forums.linuxmint.com/viewtopic.php?f=59&t=160637&p=827906#p828440
If anyone other gets it to work I would be glad if you wrote in that thread
(let this bug report/enhancement be for DP.

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