Mojave update 2020-002 - reboot on sleep

I am using a 2018 Mac Mini running 10.14.6 with security update 2020-002. 32GB RAM.

Ever since the update, when I put my Mac to sleep - or if it goes to sleep on its own - the machine shuts down after it has gone to sleep, then reboots.

I have done the prescribed resetting of the SMC; I have reset my ethernet adapter (which is my primary network connection), etc. I have not been able to get the machine to successfully sleep.

I should add: when I run

log show --predicate 'eventMessage contains "Previous shutdown cause"' --last 1h

I get:

Timestamp Thread Type Activity PID TTL

2020-03-26 13:48:37.482116-0400 0xc3 Default 0x0 0 0 kernel: (AppleSMC) Previous shutdown cause: -20

I have also tried reinstalling 2020-002, and I did an Internet recovery to an earlier state. No change. Then I reinstalled 2020-002 once more. No change. Is it possible that my Mac's firmware got corrupted during the update? (This update behaved in such a way that made me feel like there *might* have been a firmware update, even though it wasn't specifically called out or documented anywhere.)

I have not seen this behavior reported since the update came out. Is anyone else experiencing this?

Drew

Posted on Mar 26, 2020 5:14 PM

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22 replies

Drew Saur Author

Level 2

199 points

Mar 30, 2020 9:37 AM in response to ronfromnoosaville

Opera and Parallels do not stop the reboot from happening to me.

Drew Saur Author

Level 2

199 points

Mar 30, 2020 9:37 AM in response to Paul Crivellari

Thanks, but, I don't want to prevent sleep. That part is easy. I want to be able to sleep the machine without it rebooting during sleep.

Apr 24, 2020 4:18 PM in response to Drew Saur

Hello, Drew - have Apple returned your computer yet, and if yes, please let us know the status of this rebooting problem.

Thanks - Ron

Drew Saur Author

Level 2

199 points

Apr 25, 2020 10:04 AM in response to ronfromnoosaville

Yes, they did. The computer came back completely wiped, and did not present the sleep problem. However, when I did the Time Machine restore, the problem came back. Frustrating.

Hessel89

Level 1

29 points

Apr 30, 2020 5:19 AM in response to Drew Saur

That's frustrating. Unless you received a new Motherboard or your T2 firmware was somehow downgraded I do not think your problem was solved in the first place. It problably did not happen simply because you did not leave your Mac Mini in sleep before doing the TM restore.

Drew Saur Author

Level 2

199 points

May 19, 2020 6:07 PM in response to ronfromnoosaville

I 100% understand. If I wanted to keep Mojave, that was what Apple recommended to me as well, and I decided that it was worth the shot. He informed me that if the problem persisted, they would walk me through wiping the machine and putting the core hard drive structure back so that I could restore Mojave from Time Machine once more. Doing that is still a heck of a lot easier than wiping and installing a hundred pieces of software and reconfiguring preferences, etc. So I took the plunge knowing that I had a not-as-bad plan B.

But so far, so good. What Catalina update did you do for your initial upgrade? I went straight to 10.15.4. That might be why I was lucky. Not sure.

May 19, 2020 10:18 PM in response to ronfromnoosaville

Re-installing Mojave does not help. The sleep problem is there even before applying the latest Mojave security update (or Safari 13.05 or 13.1 update) that triggered this problem via AFAIK its FW update. It is depressing the Apple support does not know that (I have sent them error reports about this over a month ago but obviously that info is not spread out to regular support staff).

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Mojave update 2020-002 - reboot on sleep