Public bug reported:

e7440 Latitude / Dell Dock

Description:    Ubuntu 16.04.2 LTS
Release:        16.04

xserver-xorg-video-intel  2:2.99.917+git20160325-1ubuntu1.2

The docking station maps DP1 port of the laptop to two outputs at the
back panel mirroring the picture.

Earlier (in 14.04) it used to be two separate outputs DP2 and DP3, which
could not work at the same time with eDP(laptop screen) or DP1(laptop's
port).

The problem is very similar to described here:
https://01.org/linuxgraphics/forum/graphics-power-users/e7440-latitude/dell-dock-dual-monitors-ubuntu-14.04-fixed

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 16.04 dell dock monitors xserver

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https://bugs.launchpad.net/bugs/1686333

Title:
  e7440 Latitude / Dell Dock Fails to detect extra Display ports

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