I have the same issue.

My configuration:
- Ubuntu 14.04, with all updates
- EliteBook 840 G1 connected to a HP ultraslim docking station 2013.
- 1 HP z27i connected to the DP of the docking
- xserver-xorg-video-ati

When connecting the monitor to the DP of the Laptop everything works fine.
When connecting the monitor to the DP of the Docking Station, it is very ugly: 
tearing, artifacts, etc.

please help

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

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

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