Sleep transition timed out after 180 seconds while notifying clients about upcoming system capability changes.

Just heard back from apple support, they said they're aware of the issue. They provided me some stopgap fixes to try:

• disable prevent computer from sleeping automatically when display is off
• disable power nap on battery and power
• unplug power cord before sleeping computer
• shut down computer before not using

I have the same issue, I've got all the crash logs here. I also had an issue where the Mac would not wake from sleep without using the power button. I managed to get around that by disabling the screensaver.

My Mac was a fresh install, nothing brought over from an old Mac.

The stop gap fixes suggested by Apple (i.e. shutting down every time) are not good enough for a £3k machine.

I am having this issue as well. New 2019 MacBook Pro 16. Trying the workarounds but I hope this means they're trying to fix it.. Is it a hardware issue or software? Does anyone know what is Apple doing about it?

Have tried the same thing and it works, however it's not practical for me when I need to charge overnight. Have found that plugging it in to charge does not affect system if I have fully shut down my MBP.

Was told to try:

Reset NVRAM or PRAM on your Mac 

How to reset the SMC of your Mac 

How to use safe mode on your Mac  

I even reinstalled the OS, but realised after a few days of monitoring that the error only occurred when I plugged it in and left in sleep mode.

I have tried the following, it's working fine so far for 2 days

• Disable power nap
• Unplug power Adapter if I'm not using the MBP
• Set the "Turn Display Off after" to 2 hrs with Power Adapter

Basically, not allowing it to turn on sleep mode with Power Adapter. May be good to take this approach before the bug fix is available.

I have the same problem, reboots everyday on my new MBP 16"

So, have you tried just unplug power cord before sleeping computer? Would it solve the problem ? Other mentioned options seem not practical.

Same issue here, on a brand new MBP. Happens every day: I close the lid on the evening, and then open it in the morning and the computer reboots (saying a crash occurred). I'll try disabling Power Nap for now, while Apple doesn't come with a fix for the issue

I turned off "Enable Power Nap" and "Prevent computer from sleeping" in the Power Adapter settings and that worked for me. Not sure if it's one or the other or both, but that works for me for now.

Would be nice to not have such an issue on my brand new, very expensive computer though.

My brand new 2019 MacBook Pro 16" running macOS Catalina 10.15.4 is having the exact same problem. This happened straight out of the box and happens every single time it tries to go into Sleep mode. It happens when the computer is unplugged from the power source as well as when it is plugged in. I have not deleted any of the pre-installed Apple apps.

The beginning of the Problem Reports usually says:

"panic(cpu 2 caller 0xffffff8006c91b2c): Sleep transition timed out after 180 seconds while notifying clients about upcoming system capability changes. Suspected bundle: com.apple.iokit.IOGraphicsFamily. Thread 0x74.

Backtracing specified thread

Backtrace (CPU 2), Frame : Return Address"

This is followed by a long string of what look to alphanumeric addresses.

Would be great if Apple could address this quickly.

What should I do? As I said before I had kernel panic panic(cpu 0 caller 0xffffff8011291b2c): Sleep transition timed out after 180 seconds while notifying clients about upcoming system capability changes.

Had because after disable power nap and prevent monitor.... everything works fine. One disadvantage is that after hibernation I can turn on Mac only with power button. Anyway that’s fine for me. I can work with these settings. Anyway I have still opportunity to send it back. Time till Friday. What would you do? Return or not?

One month later . . . I am also having this problem. I am running a 2019 16" MBP on Catalina 10.15.4. Would like to hear an update from Apple about this issue! I have to restore my browser tabs and reopen any programs I have running every morning.

I have disabled power nap after reading this thread. We will see if it works.

Here is my error:

panic(cpu 4 caller 0xffffff8004291b2c): Sleep transition timed out after 180 seconds while notifying clients about upcoming system capability changes. Suspected bundle: com.apple.iokit.IOGraphicsFamily. Thread 0x74.

I have the same problem, bought a brand new MBP 16" i9 on the 15th of may. I really hope apple are working hard on fix for this. It should not happen on such an expensive macbook pro. It happens several times every day for me. Then I found this thread. I have taken the same action as suggested here and disabled power nap while plugged in to power adapter.

I hope it works. But will restore to default settings everytime apple release a software update to see if it has been solved.

My brand new Macbook is STILL having this problem. I tried the suggestions that others posted but that did not solve it. It happens every single time my Macbook goes into Sleep mode.

Given the number of other people experiencing this same issue with brand new 2019 Macbooks, it really needs to be addressed by Apple ASAP.

Same problem here. Brand new MacBook Pro 16. Not a bug one would like to see on such an expensive piece of kit.

For now, I've resolved by disabling "Enable Power Nap while plugged into a power adapter" under System Preferences > Energy Saver settings. But would like to see this fixed by Apple asap.