Ubuntu 14.04 with 3 screens and a docking station - Broadwell-U Integrated Graphics

Hello,

I just got a new Dell E7450 laptop with an Intel Broadwell-U Integrated Graphics card built in.

I wanted to set up the way I did on my previous laptop - with 2 monitors plugged into DVI ports in my docking station, and as the 3rd monitor - my laptop screen.

The problem is - Ubuntu only sees my laptop screen and 1 monitor. When both standalone monitors are switched on the signal gets cloned to both of them (so they all work, but two of them show the same image).

A collegue of mine also has the same setting, but he has the 3rd Gen Core processor Graphics Controller in his laptop, and all 3 monitors are detected by Ubuntu.

I managed to override this problem temporarily by plugging a DisplayPort -> DVI converter into the laptop directly, but that forces me to attach cables to the laptop every time i put it into the docking station, which I would like to avoid.

Does anyone have any knowledge if this Broadwell-U card can support 2 separate monitors over a docking station?

I noticed that lshw -c video shows "capabilities" for my friend's laptop which include "msi" and "pm", whereas mine doesn't. Could this be the problem?

some outputs:

lshw -c video

*-display               
       description: VGA compatible controller
       product: Broadwell-U Integrated Graphics
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:66 memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64)

uname -a

Linux 3.13.0-88-generic #135-Ubuntu SMP Wed Jun 8 21:10:42 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux