rrrize

An issue appeared on the newer MacPro with the release of the 10.11.2 update, where the system would not wake up 4K displays from sleep mode. The issue is very well documented here: https://discussions.apple.com/thread/7370824?start=0&tstart=0

I have a 2013 MacPro with two 30 inch Cinema displays and a Samsung 4K display. After installing 10.11.2 I began experiencing the above mentioned problem. I can confirm today that after installing 10.11.3 the problem no longer exists. I've tested it all afternoon and finally my 4K display wakes up from sleep mode along with both Cinema displays. Before the 10.11.3, once my system went to sleep, only my Cinema displays would wake up. I would have to restart my system in order to resume using my 4k display. What a pain that was!! This is a great update for me!!