Thank you! 
Can you explain from where did you get those possible values? 
Just if someone would read the thread later and wonder about other dell models.

For DDM 1.x. These should be self-explanatory:

• "OFF"
• "PIP-SMALL" or "PIP"
• "PIP-LARGE"
• "PBP" or "SPLIT" or "PBP-5050"
• "PBP-FILL"
• "PBP-3070"
• "PBP-7030"
• "PBP-2080"
• "PBP-8020"
• "PBP-2575"
• "PBP-7525"
• "PBP-2674"
• "PBP-7426"
• "PBP-3367"
• "PBP-6733"
• "PBP-QUAD"

These not so much:

• "PBP-2V" = 2 partitions, split vertically
• "PBP-3A" = 1 partition on the left, 2 on the right
• "PBP-3B" = 2 partitions on the left, 1 on the right
• "PBP-3C" = 1 partition on the top, 2 on the bottom
• "PBP-3D" = 3 partitions, split horizontally
• "PBP-3E" = 2 partitions on the top, 1 on the bottom
• "PBP-4B" = 4 partitions, split horizontally