with 10.11.2, Mac Pro 2013 will not wake up 4k displays after sleep like before.

I am having this issue as well. I have a Dell UP3017 hooked up with HDMI and a DELL U2417H hooked up with thunderbolt. I have them configured in different bays like apple suggest. I am running Sierra 10.12.2 (16C67). When machine goes to sleep UP3017 does not wake up and says USB port lost connection. U2417H wakes up immediately. I will have to unplug HDMI and plug back in for it to sometimes re-establish a connection. I tried the "Check un-check mirrored displays" That did work.

I am also having issues with shutting down the machine. I gets stuck and never actually shuts down. I will have to do a hard restart in the morning.

Hi.

same problems here :-(

MacPro 2013 with D300

4k Displays: Samsung 28e590d and Asus PA328Q.

Can help anyone? This problem is very annoying !

Andi from germany.

Same problem here with Mac Pro (Late 2013) also with D300.

I have 2x Apple Thunderbolt Display (27-inch) which are working fine when waking from sleep, but Samsung U32D970Q 4K won't wake up.

Started directly after installing 10.11.2.

Nobody else affected by the problem ???

I am having this issue as well:

Details Here

I have had this problem with every version of 10.x since I bought my Dell UP2414Q (24" 4K) in June of 2014.

It has always been intermittent without regard for the version of the OS. I have given up on sleeping it at all. I leave it on all day (w/ screensaver) and then push the power button once at night and once again in the morning. I leave my MacPro (late 2013) awake 24x7.

Unfortunately if I power off my monitor and power it back on, it doesn't come back any more as of 10.11.2. It used to before that 😟

I hear you. These 4K issues are a big mess and a headache for all of us unlucky MacPro owners. What really irks is that some of these displays are listed by Apple as "supported", but obviously aren't.

I originally bought my MacPro because I wanted desktop retina -- had I known that Apple was going to release the iMac 5K, I probably would have gone with that, seeing as I don't really need the brute power portion of the MacPro, but instead we are stuck out here floating in a "half-supported" world. Whose fault are these problems? Apple's or the display manufacturers or maybe even a poorly written spec. Who knows?

Ugh...

If it makes you feel any better, it does it on my 1440p monitor as well, not just 4k.

I have seen the first method work, but not all of the time.

I'll give the second solution a try!

The power button did not work 😟

I have filed a bug...

Bug ID: 23828902