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

They sent me a replacement and had the same issue again out of the box

*MBP 16"

Same issue here on a brand new MBP 16" i9 8GB 5500M. Came with 10.15.4. Not sure if 10.15.5 helps.

Nope. Mine's been exhibiting this bug the entire time I've had 10.15.5 installed. Just tested it again today...no luck.

Same here 🤞

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.

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.

To everyone who has this issue: it is true, the issue is present, however, disabling power nap, as described on the first page of this discussion, does the trick. The root issue may or may not be resolved in this version of MacOS, so I chose to simply disable the power nap and in the two months since I’ve done it there weren’t any crashes.

You may want to try that as well. :)

I can confirm that this issue was occurring with 10.15.4 which was pre-installed on my new macbook, but I can also confirm that updating to 10.15.5 has NOT fixed the issue. The only solution so far seems to be disabling the Power Nap option.

As a workaround, it seems to be sufficient to go to System Preferences > Energy Saver and disable Power Nap. I did not find any of the other suggestions above to be necessary.

Same here. Already returned 1 brand new 16" 2019 MBP because of the issue and the replacement is having the same problem. Not great for a $2,500 machine...

Disabling Power Nap does work for me, I havent had a crash in 2 weeks. However, why no response from Apple on this? This is a major issue.

I am having the same issue has happened twice and Ive only had my macbook pro for 24 hours. I have 8 GB GPU. Is this issue only happening to 8 GB?