U2415, DaisyChain sleep/wakeup issue

I recently bought 2 U2415 monitors, manufactured in Dec 2014 and daisy chained them to my laptop. I can't get them to respond after waking my laptop from sleep mode. There have been many posts on this display port sleep/wakeup issue, wasn't sure if it was affecting all monitors, or if its a cable issue,  or its a display firmware issue. I tried with different laptops and it's the same issue. I am currently using the stock cable provided by Dell.

What are the 20 digit serial numbers?
CN-0PVJVW-74261-4CP-11DL
CN-0PVJVW-74261-4CN-0FNL
Are both laptops DP 1.2 qualified?
Yes both have Intel 4400 Graphics
What specific laptops?
HP elitebook and Dell inspiron
Operating systems?
Windows 7 and windows 8.1
Video cards?
Intel HD 4400
Video card driver versions?
10.18.10.3540
DP or mDP out on the laptops?
DP out

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