I have a Lenovo T430 with Intel HD 4000 and the Lenovo Mini Dock Plus. I have connected two identical displays using the DisplayPort connectors on the dock and would like to keep the laptop's internal display also active.
I've tried various combinations, but no matter what I choose, I can only have two displays active at any given time in Windows 8 (64-bit). The Intel website shows a third display option will appear in the control panel, but I have yet to see it appear. I even tried updating to the latest driver available on Intel's website without any improvement.
What's very odd is this same laptop and configuration works fine in Ubuntu 11.04 with all three displays enabled. It seems very odd to me that the Windows driver is limited, yet the Linux driver is not.
Is there any trick to force the third display to enable? Is this a problem with Windows 8 or a limitation of the driver?