10.12.4 display sleep bug

I too have seen the messy splash of yellow mixed with a few other colors for a brief second but I'll take that over a complete reboot each time. It's odd that Apple has this issue in the first place and does not have a much cleaner wake. It's just not the old Apple I guess.

If anyone is interested I started another thread with the title "10.12.5 Display Sleep Bug Still". If you just do a search for that title I'm sure you'll find it. Just in case everyone was a little tired of adding to the 10.12.4 issue since it still exists with 10.12.5.

Has anyone found a real fix for this or has Apple made any attempt to correct this issue?

Thank you for your bravery! Given APFS and all the rest, I suspect that most of us are going to wait until 10.13.1 to wade in but this is the first positive glimmer of hope we’ve had in months!

That is certainly good news! I updated last night, everything went well although I have not had time to fully test I should know in a day or two. Fingers crossed!!!

Issue continues on High Sierra for me (iMac 5k connected to Dell 4k monitor) 😢

unfortunately, my issue has not gone away. My system still does not go to sleep, and when I manually pu tit to sleep, does not wake up so I have to reboot.

Those of you who have a Retina iMac and who have upgraded to High Sierra: Is anyone still having the issue?

It sounds like others with MacBook Pro might still have a different, similar issue.

Same issue.

Late 2014 iMac 5k with an external Monoprice 4K display.

AMD Radeon R9 M295X graphics card.

On 10.12.4. I don't know if the problem existed before 10.12.4 as I didn't install Sierra until 10.12.4 was released.

Sometimes just the iMac display fails to come back on. Sometimes both displays fail (in which case I have to remote in to the machine to restart it).

When looking at System Information when this happens the iMac display isn't listed at all. I haven't checked System Information when both displays have failed, but will try to next time. I'd imagine both will be missing.

I've also noticed that when this happens my Bluetooth device(s) disconnect.

Once this happens I've tried switching the port the external display is plugged in to, and tried putting the display to sleep again (it's on a hotkey) while it's not working nothing brings it back up. I've tried resetting PRAM (NVRAM), no luck.

In an effort to help troubleshoot, someone else mentioned some apps they have start from Login. Really, the issue would be any services that stay running all the time. So here is my list, maybe we all have one (or some) in common.

For me these are:

• Little Snitch
• Dropbox
• Divvy
• Moom
• Keyboard Maestro
• SteerMouse
• EvernoteHelper
• TimingHelper
• TransmitMenu

I can confirm that I am experiencing the exact same issue, with what sounds like the same setup (iMac 5K + Dell 4K monitor). This never occurred prior to 10.12.4 update. If I leave the external monitor disconnected, I do not experience this issue.

I have a similar problem with 2015 MacBook Pro Retina, macOS Sierra 10.12.4. The lid would be closed with an external monitor connected via Thunderbolt/MiniDisplay port. Everything is running fine - I can sleep my laptop and wake it up - the external monitor would be turned on right away. I have not tried using the external monitor and my laptop's screen at the same time. However, if I disconnect my laptop from the external monitor and open up the lid, then the screen remains black. I can hear music playing from my laptop, I can pause it, etc. The laptop seems to be running, however the screen remains black. The only way to turn on the laptop screen is to reboot the system. This is far from ideal. I had no problems with 10.12.3. This is a huge regression in my opinion.

I'm also having this issue with my 2015 Retina iMac attached to a Dell 4K display. Everything was working fine until I upgraded to 10.12.4.

In my case, I sometimes (but not always) run into an issue where neither display will wake up. When this problem shows up, I've been remoting into my iMac from another device and choosing Restart from the Apple menu.

I tried resetting the PRAM, which didn't help. I'm also planning to reset the SMC, but don't think this is likely to help.

I've also uninstalled Duet Display and turned off Night Shift to see if this makes a difference.

At the risk of just sounding like I'm "piling on", I too have had this issue. I installed 10.12.4 on Wednesday (03/29) and ever since when I come out of power saver (display off but computer running) the iMac screen stays dark. Well, almost. The screen comes on for a split second and then stays off. I have 2 4K monitors hooked up and they both come on like normal. At first I just rebooted the computer since I was able to access the menu from either of the other monitors but after having to do this every time I started looking for answers and came across this site. My iMac was working perfectly prior to the update and the only thing that changed was the update. I don't have the Night Shift option enabled and I have never used Duet Display. I also do not have any of the other apps installed that I have seen on other forums. So until this gets fixed I have disabled my display power settings ("never" in energy saver settings). Hopefully this will be addressed soon.

I am seeing it as well with configuration (iMac 5K - 27" Late 2015 + Dell 4K monitor P2715Q). I have been able to initiate a reboot via the Dell monitor desktop but haven't found a way to wake up the iMac display.

I have the same problem with a Dell P2415Q 24" 4K. I have found a temporary workaround is to turn off the Dell screen before putting the iMac to sleep. Then after you wake up the iMac, turn the Dell monitor on. Everything should go back to where it was. Unfortunately, I don't always remember to turn off the Dell 1st before sleeping and then I have to power down the iMac and restart. Hopefully a new macOS update fixes the issue soon.