I have been trying to set up a three-monitor configuration on my laptop.
I have a Thinkpad w520 with a Lenovo Thinkpad dock station also, Nvidia card with Optimus support and nvidia-331 drivers installed, also Intel graphics card. I had the same configuration a while ago but it broke after an upgrade. I decided to reinstall version 14.04.0 and update bit by bit.
Now (without updating much), I can only get the three monitors working when turning on the laptop and afterwards connecting it to the docking station.
When restarting the laptop in the docking station, only two external monitors can be used and the built-in monitor of the laptop goes black: I can see the mouse on it but nothing more.
Any idea on what should I tweak for fixing this?