PS: Actually I had most of this (Laptop-Diplay-Port & Docking-Station+VGA-Port & partially Docking-Station+Display-Port (partially because of rendering issues on DP-Port)) working in Ubuntu 14.04 (see https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1376581) and therefore I don't think this is really related to the BIOS - because at this time I had old BIOS version.
PS: Actually I had most of this (Laptop-Diplay-Port & Docking- Station+ VGA-Port & partially Docking- Station+ Display- Port (partially because of rendering issues on DP-Port)) working in Ubuntu 14.04 (see https:/ /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/1376581) and therefore I don't think this is really related to the BIOS - because at this time I had old BIOS version.