I have 3 U2414 using the DP MST Daisy Chain. I am using a 2x ASUS Direct CU II 780GTX running in SLi
#1 (Left) connected to PC DP 1.2 ENABLED
#2 (Middle) connected to #1 DP 1.2 ENABLED
#3 (Right) connected to #2 DP 1.2 ENABLED
Everytime I restart the PC all 3 go into power saving mode. The only way to get everything back is to disconnect everything, run a hard reset on #1 and gradually bring the other two on line. Getting #1 to work again as the DP is extremely fussy and will sometimes not detect the PC even by plugged in alone.
I have reversed the screen positions several times, they are ALL having this behavior. So its not just a bad apple of the trio, there is something seriously off here.
Needless to say I am about to make a decision whether I want to keep them because this is too much it can take hours each night of configuring and testing just to get all 3 screens to work again.