10.12.5 Display Sleep Bug Still

> Have all of us upgraded memory with third party modules?

Here, it reproduces with two different 2014 Retina iMac 27 units that were BTO with 32GB via Apple's online store.

BTW, for anyone running across this thread without the context of the original thread:

Re: 10.12.4 display sleep bug

This is basically the same thread except the author thought increasing the macOS version number was helpful to reflect that the issue that was introduced in 10.12.4 wasn't updated in 10.12.5.

I asked these questions in the 10.12.4 thread on this problem but for people experiencing this problem....

Are we all running iMac 5K Retina machines? I've seen posts from folks with Mac Minis and MacBooks

Have all of us upgraded memory with third party modules? I've seen posts from folks who just got their machines fresh out of the box.

Have all of us upgraded to more than 16GB of memory? If I recall, there are folks with just 16GB.

Just curious to see if there is any correlation with hardware, or whether this is just a software bug in Sierra - which if you recall didn't happen before the release of 10.12.4.

At this point, it has now been at least 2 months since Apple was made aware of this problem and we still have no solution after one OS update. People like me have businesses to run using our high-end iMac's that we so foolishly bought to upgrade from iMacs that might have been slow, but were perfectly fine.

I'm thinking that the situations where memory was pulled from machines was just like resetting SMC and NVRAM which is known to temporarily fix the problem. I'm wondering whether people who "solved the problem" by pulling memory, have had experienced a permanent solution or whether the problem came back a few days later which is what we've all experience after resetting SMC and NVRAM.

So I'm going to go back to the AppleCare folks and I'm also going to be vocal about this at WWDC.

iMac (Retina 5k, 27-inch, Late 2015)

Processor 4 GHz Intel Core i7

Memory 32 GB 1867 MHz DDR3 (all stock)

Startup Disk Macintosh HD

Graphics AMD Radeon R9 M395X 4096 MB

Secondary display - Samsung U28E590D 4K 27.5in (doesn't seem to have any issues and energy saver mode is off)

Secondary display - LG 27UD68 Ultra HD Display 4K 27in (does not come on after sleep sometimes - have tried with and without energy saver mode on)

Primary iMac display lowers resolution when LG display doesn't come on. Re-seating the display port on the LG solves the issue.

Sometimes the Primary display does not turn back on after sleep and the two secondary displays turn on at full resolution. Nothing I have tried will reset the primary display and turn it back on other than rebooting the iMac.

Issues started happening immediately after upgrading to Mac OS 10.12.4 and continue with higher frequency in 10.12.5. Never had a single issue before upgrading to 10.12.4.

This is a very frustrating bug to be dealing with on such an expensive piece of hardware.

With respect to "where" to report this bug, if you have an Apple developer account, you can log into the Apple Bug Reporter and report the bug. I met with an engineer at WWDC and he recommended doing a sysdiagnose when it is in the dark iMac monitor state and attaching that to the bug report. He took a quick look at the bug report database and couldn't find this problem so it is possible that no one has entered it (please reply if you have and have a bug report case number because I could bring that to an Engineer at WWDC today). He said that the AppleCare / Warranty channel is buffered too much from Engineering and that the best route was direct to the Bug Reporter.

The command-line utility

sysdiagnose

This issue has been resolved for me. Please read my post in the original thread:

https://discussions.apple.com/thread/7906502?answerId=31860585022#31860585022