Mac Studio and M1 Mini kernel panic with USB-C hubs

I have two bus-powered USB-C hubs made by different manufacturers. When I plug either of them (with no other devices plugged in) into my Mac Studio or M1 Mac Mini, I'll soon get a kernel panic like this:


panic(cpu 0 caller 0xfffffe001f2a88d4): Sleep transition timed out after 35 seconds while notifying applications.
Debugger message: panic


This mostly happens when the Mac is asleep. I first noticed it happening when I'd plugged in a hub into my Mini which is in my bedroom. It reboots spontaneously every 45 mins or so. It also panics in the same way at random intervals while powered on and in active use, suggesting it's talking about some kind of "USB Sleep", and not system sleep. Disconnecting the hub stops it happening.


I have also seen this kernel panic on my Mac Studio without a USB-C hub connected, but it happens far less often. I do have a USB 3.0 hub as well, but that one doesn't seem to cause problems, it's only newer ones with USB 3.1 + C support. Aside from that, the symptoms are the same on both machines: panics while asleep.


I see that this panic has been reported since the introduction of Apple Silicon fairly regularly, and seems to be caused by USB hubs from many different manufacturers, though there are reports of some monitors causing it too (like the Apple-backed LG 5K ultra fine).


Both machines are running Monterey 12.5.


Does anyone have any fixes for this?

Mac Studio

Posted on Aug 10, 2022 04:14 AM

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6 replies

Aug 10, 2022 07:15 AM in response to Marcus Bointon

Now it's starting to sounds more like you are experiencing the same Computer Sleep problems that others are having, instead of an actually USB or USB-C hub issue.


Test the following Energy Saver Settings and only allow the Display(s) to turn off.



Then settle for only allowing the Display(s) to turn off each night or do a full shutdown.


Plus please use the follow Feedback links to let Apple know.

Feedback - macOS - Apple

Feedback - Mac mini - Apple

Feedback - Mac Studio - Apple

Aug 10, 2022 07:13 AM in response to Marcus Bointon

If this happens when no Hubs are connected, then it is not likely a direct causal relationship between hubs and the sleep timed out errors. (They may make it happen more often.)


Readers here have no magical workarounds to hand you. To make progress, you will need to talk to Apple support, work through the obvious issues, and if no solution, ask for a specialist. Be polite and professional, and ask them to file a bug report on your behalf, or add your info to an existing bug report.


Get Support


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Aug 10, 2022 08:23 AM in response to den.thed

Even without that set, I've found that sleep on the Mac Studio is somewhat broken anyway. Though it turns screens off (apart from the common "dark wake" loop problem), it doesn't actually go to sleep at all. USB devices remain powered, processes don't stop, network activity continues, power consumption remains high. Occasionally it does seem to sleep a bit and doesn't idle the fan, but it gets very warm. The Mini sleeps fine.

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Mac Studio and M1 Mini kernel panic with USB-C hubs

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