Take a look at this PDF - might be useful to figure out screen configurations on the MacPro 6,1 and how the MDP ports relate to the display order in Catalyst V5 PRO
The MDP ports relate to the 'display-index' in catalyst
So if you follow the order in the PDF attached - it 'should' match Catalyst screen order
Apple logo appears on Screen 1 (MDP4) during boot
Display Index 1 is always the primary screen
Assign the Primary Screen to the monitor connected to MDP4.
IMPORTANT: - Then you have to move the screens in system preferences to match catalyst!…
It is easier to attach the screens 1-by-1
If you arrange the screens in a line (1-6) in system preferences, it is difficult to figure out which one is screen 3,4,5 in catalyst. But if you move screen 4 down slightly in system preferences arrangement - it makes it easier to identify the screens in the catalyst
Output Display Arrangement.png
The order will remain the same unless the EDID or screen is changed/removed
NOTE - if you change or disconnect a screen, or change the EDID, you will have to re-adjust the arrangement in system preferences.
Users must assign the correct 'Display-index' to the correct Output in Catalyst output preferences:
Display-index 1 - to – Output 1
Display-index 2 - to – Output 2 (defaults to 1 for new show)
Display-index 3 - to – Output 3 (fixed)
Display-index 4 - to – Output 4 (fixed)
Display-index 5 - to – Output 5 (fixed)
Display-index 6 - to – Output 6 (fixed)
Output DisplayIndex Allocation.png
This seems to work for us.
Please test some of these configurations to see if they work on other MacPro 6,1
Let me know
Regards
MDP Screen Order v2.3.pdf
Simon