This environment is not operational:

Dell Latitude e7440 (Gen4 HD Graphics 4400)
Docking station Pro3X with a single DisplayPort 1.2 port
Two Dell U2414H DisplayPort 1.2 capable monitors
Daisy Chain connections from Docking station to Mon1 then to Mon2

Xubuntu 14.10 64 bit
uname -r:  3.19.4-031904-generic
Intel Graphics Installer for Linux 1.0.8 for Ubuntu 14.10 64 bit.

Problem: The external monitors are not recognized, only the laptop
monitor.

Am I doing something wrong, or does this environment continue to not be
supported?

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https://bugs.launchpad.net/bugs/1104230

Title:
  DisplayPort 1.2 MST support is missing in the Intel driver

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