I am running Windows 7, with one graphics card (Sapphire AMD FirePro W5000), running 5 monitors in a physical configuration of 2 on the top row and 3 on the bottom, but whenever I try and rearrange them either via the Windows "screen resolution" screen, or the AMD Catalyst Pro Control Center, I just get a bunch of screen flickering while it tries to accept the layout, then a bunch more while it changes them to all be on one horizontal line.
Driver Packaging Version: 12.104.2-130529a-158352C-Retail
2D Driver Version: 8.01.01.1295
OpenGL Version: 188.8.131.5238
Catalyst Pro Control Center Version: 2013.0530.352.5022
The graphics card has 3 outputs, 1 DVI and 2 DisplayPort 1.2. I've got a Club SenseVision MST Hub in one of the DP outputs that lets me run three displays off that port.
It's taken a bit of mucking around with active and passive adapters to get a picture on all the screens (I was trying to use some Dynamix active DP to HDMI adapters which were hopeless and didn't work).
I started with no MST and just tried to get three screens working off the W5000, and then found out about the Windows 7 only-two-legacy-cables limitation and got around that with an active adapter.
Then when the MST arrived, found that it didn't require active adapters - passives seem to work fine (I think the hub itself must be active).
I can arrange them in one line vertically and if I unplug one I can arrange them in a 2x2 square, but pretty much any other shape (L, 3 on top 2 on bottom, 2x2 with one extra off side, all just get reset to one line. Even just moving one of the screens in the line, up a bit gets reset.
Is this a driver issue? I've tried 3rd party multi-monitor software like UltraMon and Actual Multiple Monitors, but they are all just layers over the top it seems.