After upgrading to 10.12.4 yesterday, I'm getting a weird display sleep issue with my iMac 5K. If Energy Saver turns my displays off (set for 15 minutes), the iMac display won't come back on without a reboot. Strangely, my external Dell 4K Monitor will come out of sleep.
Super annoying. Silly bug.
iMac with Retina 5K display, macOS Sierra (10.12.4)
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.
If this follows past experience, it takes sometimes up to 2-3 days for the problem to re-surface after an OS update.
Since my iMac 5K is in production, we never update to .0 releases so we’ll be waiting for 10.13.1 anyway.
Depressing news...
Because 10.13 is a new OS release, we can post NEW bug reports so I would recommend that anyone who can reproduce this problem on 10.13 file detailed bug reports. Anyone can create a developer account for free and file a bug report.
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:
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.
Thanks for that workaround. My problem with that suggestion is I know me and I would either forget to turn off both external displays or get really annoyed with having to turn on the monitors every time.
I have this same issue with 10.12.4 on 2 identical setups, one at home and one at work; iMac 5k i7 and Dell P2715Q. I reset NVRAM and SMC on one and the problem went away and on the other the same sequence did not work?
I am really annoyed, I buy Mac's because I need to work, they are meant to work and they are do not behave like PC's. Of course this happens when I have multiple deadlines approaching ...
Apple please fix this!
OK, I seem to have fixed the issue, at least for me. I thought I had done this originally but I must have done it incorrectly (or maybe you have to do it more than once) but I reset the NVRAM and SMC (in that order) again and all my monitors seem to wake up normally including the main iMac display. I know others have stated that they tried this with no success but for the moment it seems to have worked for me. I'll keep a close eye on this to see if the problem resurfaces and report back if it happens again.
I retried resetting the NVRAM and SMC on my iMac. At first I thought maybe that did the trick, but even thought the main iMac screen has correctly resumed from sleep a few times, most of the time it does not. When this occurs on my system, occasionally the secondary Dell screen will wake up, and I can reset the Mac from the menu on that screen. Other times the screen will wake up, but no menu is displayed (only the mouse pointer). On other occasions neither screen will wake up, but I know the Mac is not hung up because the Caps Lock key still responds. So it is kind of random.
I tried using an old Acer X203W screen with a DVI to DisplayPort adapter, plugged into the same port on my iMac, instead of the 4K Dell P2715Q. So far I have NOT had the problem, the iMac and Acer screens wake up every time. When I switch back to the 4K Dell, or use the Acer and the Dell, then problem is back.
I updated my MacBook (mid 2011) to 10.12.4, with Dell P2715Q attached as the secondary screen (although obviously not running at 4K). I cannot duplicate this issue on my MacBook Air with either the Dell or Acer screens, it works every time. At least in my case, it only occurs on my iMac 5K + 4K Dell P2715Q.
So much for that. It worked for me the first 2 times I tried to come out of power saver but when I got home tonight it did it again and I had to reboot the iMac to recover. And I had such high hopes. Is there any chance that anyone from Apple is monitoring this forum?
Adding to this thread... I have been having issues with my iMac 5K since I got it, not going to say it is Apple or the iMac's fault in total. I installed 64GB of ram and then found that one of the chips was bad after hours and hours of troubleshooting and re-installing Sierra twice.
Now I am at this point, I changed to using to Thunderbolt Hub's one is the CalDigit and the other is an OWC and everything was working fine till I did updates to 10.12.4 and then whenever I would come back to my desk shake the mouse or hit enter on the keyboard the iMac would come on display my desktop for a second then go off and come back on once along with my two external 4K LG Monitors and then while the two LG monitors stay on the iMac goes off and doesn't come back on till I do a reboot.
I have disconnected everything and the iMac works as it should so it seems to be a thunderbolt, external monitors issues or something along those lines. I see a lot of people have removed Duet, honestly I never installed it or use it... unless it comes with the iMac or Sierra and I just have not seen where to delete it.
I have reset SMC and NVRAM and changed around the LG monitors and how they are connected with no help. I will set the first two times out of sleep right after I reset the SMC and NVRAM it worked and I thought I was in the clear of the issue but it came back the evening when I got home from work. I have pretty much tried everything everyone has suggested or have tried with no success. I almost want to go back to Time Machine and go back to before the update and see if it fixes things until there is a fix to this new update.
Hopefully someone sees this and fixes it in the next update.
10.12.4 display sleep bug
