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

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?

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.

True that. I was also told that it's an issue that had been reported by many users/purchasers. I mentioned to the Customer Care agent that for the money spent on these things, one would expect that it would work first time every time?!

I'm not sure that simply disabling Power Nap is a viable workaround. I've disabled it plus all the other fancy sleep/hibernate features and just gone back to a plain old sleep with no sort of session writing to disk (meaning if it crashes, i reboot and start again fresh—which I'm fine with).

Point is, even with Power Nap disabled along with the other stuff, the machine still crashes 180 seconds after going to sleep when connected to an external display. MBP 16".

Note: mine did not always do this. I can't recall when, exactly, this began. Maybe Catalina?

Yes, disabling Power Nap does not always solve the problem. I’m connected to an external Dell display, via DisplayPort.

And updating to the Big Sur beta did not fix the problem as well, which was quite disappointing.

I have same issue on my macbook pro 13 2020 higher end model. Final cut pro also crashes so many times... I have been Apple user for last 20 years and this is the first time to experience this level of disappointment. Is this end of Apple era?

Yep, same for me. Brand new MBP 16".

8GB GPU.

The person I talked to said it was likely software and that they’re aware, so a fix is almost certainly in the pipeline.

Same here. I've still been charging while my MBP 16" sleeps.

I also have this issue at least once a day, brand new MBP, 2 weeks old. Sad. Any word from Apple on fix?

How does it look today?

Same here: brand new MBP 16" - same error 😞

I'll wait for the fix and will disable power nap to wait it out...

Same error happens frequently. New MacbookPro 16.

This crush is annoying that happing again and agin. I checked others' posts however not found a proper solution yet.

Replying to Kezron1 - I have the 16" 16GB and it happened to me within the first day as well - Have only had mine for 2.5 weeks...

Same issue out of the box.