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["R. Becke" <subscribe.becke@xxxxxxxxx>]

I have the same issue.
My configuration:
- Ubuntu 14.04, with all updates (Ubuntu 3.13.0-37.64-generic 3.13.11.7)
- EliteBook 840 G1 connected to a HP ultraslim docking station 2013.
- 1 Acer B273HU connected to the DP of the docking

FGLRX: linux-amd-catalyst-14.6-beta-v1.0-jul11.zip: fglrx-14.20
(I had to install the following packages:
sudo apt-get install dh-modaliases execstack dkms lib32gcc1 build-essential xserver-xorg-dev
Before I could then finally build the package:
~/Downloads/fglrx-14.20$ sudo ./amd-driver-installer-14.20-x86.x86_64.run --buildpkg Ubuntu/trusty
And install it:
~/Downloads/fglrx-14.20$ sudo dpkg -i fglrx_*.deb fglrx-amdcccle_*.deb
)

When connecting the monitor to the DP of the Laptop everything works fine.
When connecting the monitor to the DP of the Docking Station nothing happens.

One more thing to mention is that when using the official driver: "Using X.Org X server - AMD/ATI display driver wrapper from xserver-xorg-video-ati (open source, tested)"
Then the DP of the docking station works fine (but the rendering on the external monitor is ugly: tearing, artifacts, etc.)

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https://bugs.launchpad.net/bugs/1376581

Title:
  DisplayPort monitor not properly detected via HP ultraslim docking
  station 2013

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  DisplayPort monitor not properly detected via HP ultraslim docking
  station 2013

  My configuration:
  - Ubuntu 14.04, with all updates (3.13.0-36.63-generic 3.13.11.6)
  - EliteBook 850 G1 connected to a HP ultraslim docking station 2013. 
  - 1 Dell 2209WA connected to the VGA port of the docking
  - 1 Dell P2414H connected to the DP of the docking

  Currently I have the lateste fglrx (14.301.1001), but if was the same
  with the version from Ubuntu repo.

  This is the output from xrandr:
  Screen 0: minimum 320 x 200, current 1680 x 1050, maximum 8192 x 8192
  eDP1 connected (normal left inverted right x axis y axis)
     1920x1080      60.4 +   59.9     40.3  
     1680x1050      60.0     59.9  
     1600x1024      60.2  
     1400x1050      60.0  
     1280x1024      60.0  
     1440x900       59.9  
     1280x960       60.0  
     1360x768       59.8     60.0  
     1152x864       60.0  
     1024x768       60.0  
     800x600        60.3     56.2  
     640x480        59.9  
  DP1 disconnected (normal left inverted right x axis y axis)
  HDMI1 disconnected (normal left inverted right x axis y axis)
  DP2 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
     1680x1050      60.0*+
     1280x1024      75.0     60.0  
     1152x864       75.0  
     1024x768       75.1     60.0  
     800x600        75.0     60.3  
     640x480        75.0     60.0  
     720x400        70.1  
  HDMI2 disconnected (normal left inverted right x axis y axis)

  There is some scrambled image displayed on the DP monitor like in the
  attached image.

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