MacBook Pro 16" Kernal Panic During Restart when Plugged into Dual Monitors

I assume you have tried just turning the monitors off and letting the computer sleep? With updates to 10.15.3 and 10.15.4 it has stopped happening on my MacPro 2013.

Following the Mac OS Catalina 10.15.5, I re-enabled PN, no crashes yet, but sometimes takes a couple of days to materialise.

I have same issue here,

2 monitors attached, but the issue also happens with only one but with less frequency...

as it happens on wake up, with lid closed or not and it seems to be random

i have done a kernel debug and found out that the issue happens only when the system wakes us making a call to core 0

i guess it is a software bug and i really hope Apple will look into this asap as it is extremely annoying...

if you guys have any suggestion or work around all is welcome

cheers

+1 here. Fully specced MBP 16 attached to one LG Ultrafine 5k and on sleep, the laptop has a kernel panic and shuts down. Super annoying. Tried uninstalling Dropbox and other apps that were appearing in the log, but did not do any good. Also tried reinstalling MacOS (no reformat though) and this didn't change anything. The only reason I was able to figure out the kernel panics are related to the monitor is because when the laptop is unplugged, this problem does not present itself. Based on everyone's experience here, it does seem to point to some bug in MacOS that needs to be addressed ASAP. I cannot have my machine crashing on sleep, especially when I have my work in progress open on the machine. Apple please fix!

I've been in contact with service and now they are wanting my machine in, stating it is a hardware issue and in need of repair, but will not tell me exactly what the problem or intended repair will be. The problem ONLY occurs when connected to the two LG UltraFine monitors. Took it to the local Apple store for examination and they stated it was a software problem. The computer works fine and does not crash upon sleep when it is not connected to the monitors. Very, very frustrating.

Yes, I am only experiencing this when the computer— connected to one or both LG monitors — goes to sleep. It crashes upon awakening. LG display software up todate. Apple support when taking to a store for examination said it was software. Now Apple support says it is a hardware issue and needs to be sent in based on the same error messages, but refuses to tell me what exactly will be repaired. The computer goes to sleep and fine when not connected to the displays. Very frustrating. I fear I’m sending it in and will have the same problems when I get it back.

Hi, we tried this approach with Apple Support after several troubleshooting sessions, but was still getting the kernel panics after changing these settings. Same error messages were then routed to Apple Engineers, a week later was notified by Apple Support that it was a hardware issue, but would not disclose what issue or any specifics when directly asked several times. If it were a hardware issue I would think that one would be seeing more problems when actively using, not just when the computer goes to sleep at night/woke up the next morning to see it crashed.

Thanks. I sent my computer in and have been told that a part had to be ordered for replacement, but no other details. I've hooked up an older laptop to one 1 LG monitor and it has been working without any issue, so waiting to get the newer machine back to see if said repair actually works or not.

AGREE. I sent my laptop in for repair on April 2 and received back 10 days later on April 21 with a note stating that the logic board and Touch ID boards being replaced, as well as clean OS install.

Connected to monitors, laptop put to sleep overnight...another kernel panic this am, same error messages as before.

VERY FRUSTRATING. Apple needs to escalate and resolve this issue now.

I'm a bit confused as to why you're posting this? Why not just contact Apple again and tell them your issue was no resolved? No one here is an Apple technician and only Apple can help you at this point. Have you considered requesting a replacement?

The forum needs to stay focused on the problem. Actually shutting off the PowerNap suggestion was made by Apple engineers and service support prior to sending the computer in for logic board replacement.

Hi. Thought I'd share here too. I've been experiencing the kernal panic from sleep issue from 10.15.4 onward on my 16" MBP bought in February. Was onto apple support with no solution found (tried all the resets, clean reinstallations, eliminating external monitors, 3rd party software etc).

Then found the disable powernap "solution" with 10.15.4, which worked just fine.

Made the mistake of upgrading to 10.15.5 and the problem got worse, kp'ing from sleep every single time.

Today I installed the supplementary update (I keep hoping they'll solve the issue) and now it sleeps and wakes fine, so long as it isn't plugged into my external monitor (Dell U2715H). When plugged into the monitor it KPs during sleep every time, though the time it takes to KP varies (I hear it whoosh).

Have tried resetting the SMC again, switching off various power save options, none making any difference right now. I guess it's just a case of waiting for more updates to solve this.

It's more likely a software issue. Something to do with the plugged in monitor not letting the computer to go to full sleep. Try to not plug in the power adapter for one night.

nope,

only disabling PN reduces the issue but does not fix completely

even with PN disabled i had a few panic

only my experience though :-)

Update: Just as a further thought and test...I separated the monitors from a single thunderbolt bus to two separate busses(?), my Mac Pro 2013 has three thunderbolt/video busses.

Nothing special at all in the shutdowns, shutdown regardless of anything else seems to work fine.

FWIW.

No way am I doing a full system reinstall that may not work for such a simple workaround.