Problem with Dell P2715Q and Mac Pro connection

I have a Mac Pro 2013 with AMD 500, 64 GB RAM graphic card.  I just bought a pair of monitors Dell P2715 Q 4 K after using my 30 "Apple Cinema Display for many years.  Monitors properly function while I actually use and I can manually put the system to sleep (using the option-command-eject) and I'm able to wake the system by pressing the keys on the keyboard.  They work in 60 Hz mode UHD (3840 x 2160) and are connected with the display port (Thunderbolt) mini display port cables with that monitors came.  They are connected to two of the three bus TB. The problem is that when I restart the computer (or stop and start up), the monitors will automatically in their 'power save mode', and the Mac Pro does not seem to recognize that they are there, trendy, so I get two blank screens... no way to connect, because there is no current login screen.  The only way I can actually connect and begin using the computer is to connect an old 23 "Cinema Display, connect, and then connect the two valleys and unplug the 23". Yes, I can leave the computer and he just put the system to sleep, but when I need to close for a software update or the failure, I won't have to drag another monitor comes to start using the Mac Pro.  I have 27 days to return if necessary Dells.  Anyone have any ideas on how to solve this problem?

That Mac has made recognition of the display for a long time consists of sending a query to display at certain times, by asking, "what is your name, and what are your skills? If these screens are asleep, they fail, and then they stay dark.

These times are:

shortly after the market.

upon awakening from sleep

When inserting the cable end Mac

Since the Option-(detect poster) button in the display panel.

Perhaps there is another way, you can arrange to have the display be awake when the Mac it sends the request?

Tags: Mac

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