<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [HSW dp mst] Dell dock DVI knocks out DP when unplugged." href="https://bugs.freedesktop.org/show_bug.cgi?id=72795#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [HSW dp mst] Dell dock DVI knocks out DP when unplugged." href="https://bugs.freedesktop.org/show_bug.cgi?id=72795">bug 72795</a> from <a class="email" href="mailto:christer.folkesson@digpro.se" title="Christer Folkesson <christer.folkesson@digpro.se>"> Christer Folkesson</a> <pre>(In reply to <a href="show_bug.cgi?id=72795#c1">comment #1</a>) > 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 <a href="show_bug.cgi?id=72795#c12">comment #12</a> 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 <a href="http://forums.linuxmint.com/viewtopic.php?f=59&t=160637&p=827906#p828440">http://forums.linuxmint.com/viewtopic.php?f=59&t=160637&p=827906#p828440</a> 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.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>