MBP 13 2020 won't recognize USB devices from TB dock after sleeping and connecting to the dock. After unplugging the dock MBP crashes and does SMC reset

Device: MBP 13" 2020 10th gen i5

Catalina 10.15.6

Dock: CalDigit TS3+ with firmware 44.1


I'm not sure if this problem is exclusive to Catalina 10.15.6, but I can't say since my dock arrived after the latest update got shipped and I haven't tried if it works on 10.15.5.


Basically, I unplug the dock at night and put the MBP to sleep. After a few hours of sleep it seems to stop recognizing the USB devices plugged into the dock. The dock has a USB audio interface, a logitech wireless dongle (for G604 mouse), a DP monitor and the power supply for the dock. When I plug it after the mac has been in sleep for hours, the mac won't recognize the audio card and the mouse (just the USB issue we had in previous catalina versions with all kinds of USB hubs and USB devices), but the monitor works and everything has power supplied to it, including the USB devices.

If I then unplug the dock and replug it, often the mac straight-up crashes completely and shuts down, powering on with an error that it recovered from a problem ( it also does an SMC reset).


The error report later states: "Intel CrashLog recorded due to unexpected reset".


This reddit thread speaks of the exact same issue with a different monitor and some people with different docks:

https://www.reddit.com/r/macbookpro/comments/i0m9si


Basically, what I'm saying is that the original USB issue is not fixed yet and now it's much worse because:

  1. You can't fix the USB problem unless you restart the mac - re-plugging the devices into the dock won't solve it
  2. The macbook directly crashes and does an SMC reset if you unplug/replug the dock, wiping your unsaved data and crashing anything else you might have open at the time


Additional problem: Monitor sometimes doesn't wake up at all after mac is awoken from sleep. At one point the monitor went to sleep WHILE I was using the mac actively.


I have tried NVRAM/SMC resets and they did nothing.


I wrote an email to CalDigit and they confirmed a lot of other users have complained about this:


"Our engineers have been investigating into the brand new 2020 MacBooks as we’ve had detailed reports from several of our customers who have tried many different brands of docks, from OWC, Kensington, Elgato and ours and none of them have been able to function correctly via the latest chipsets in these Macs."


PLEASE FIX the usb/dock/monitor issues already! This is a problem of Apple devices exclusively. This is unacceptable for a laptop at this price from the year 2020. Cheap off-brand laptops do not have such issues with peripherals!!

MacBook Pro 13″, macOS 10.15

Posted on Aug 4, 2020 11:01 AM

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Posted on Jan 16, 2021 2:25 PM

11.1 fixed it for me on my 2020 Intel MBA. I could reproduce it consistently every time before that version, and now I can't make it fail. It just picks up and keeps on going.


This is with multiple bits of TB hardware, too: a TB3 dock and an old Apple TB monitor. Both of them work, whether direct to the machine or with the monitor behind the dock.


It was bad, but it's over. Try it.

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344 replies

Oct 22, 2020 7:13 AM in response to Dan Mønster

I understand why nobody at Apple would want to put that in writing. Maybe someone want to explain that particular "engineer" that the 90s are over.


I'm allowing myself to make fun of the word engineer as I am one, working in the computing world :)


This is riduculous, I tested Big Sur Beta 11 and I saw some issues, but I'm not sure they are the same though.


Oct 23, 2020 2:07 AM in response to beezur

beezur wrote:
I will happily buy an Apple Silicon machine.

This is certainly not a good method how to say Apple you are not happy with their current support...


It's crazy how majority of Apple customers think - Apple sells stuff for premium prices and can't provide elementary support. They laugh and say thunderbolt is not intended to be hotplug and that we are using it wrong and Apple customers still go and buy another product. This is crazy. No wonder PC users call us sheeps.

Oct 23, 2020 6:25 AM in response to Hacky_4

The truth is that I have a 2010 iMac which has now had upgraded SSD, WiFi/bt, processor, ram, even graphics card. My laptop before this 2020 MBA was a 2013 MBA. I don’t unnecessarily give Apple my money. But I did think this was a good long term solution. It is not. I do need another long term solution, so if Apple Silicon is it, then I will gladly trade.

Oct 23, 2020 10:19 AM in response to luzluz

This is interesting news to me - I figured it only happened with my Apple Thunderbolt Cinema Display. But it seems like it´s connected to connecting any external display.

Which is a bummer for me: I can´t reboot my Laptop every time before I connect it to an external display - I use it frequently (several times a day) for giving presentations. And all the meeting rooms now use USB-C docks to connect to the display.

Oct 26, 2020 8:45 PM in response to broko_fankone

I have a new 2020 MacBook Air running macOS 10.15.7 and I get this error too after I shutdown. I have an Anker USB C Hub PowerExpand Direct 7-in-2 docking station https://www.amazon.com/gp/product/B07YZ48HCT/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1 with a 26" Dell monitor connected via HDMI. Almost ever time I shutdown the MacBook Air reboots with the below error. I send it to Apple every time. It is quite irritating.


panic(cpu 0 caller 0xffffff7f9c333b66): "[IGPU] sendHostToGucMessage: Firmware communication error: no action response!\n"@icl/sched3/IGGuC.cpp:3626



Oct 29, 2020 6:37 PM in response to logicito

Excellent news. I'll go ahead and bump up to 11.0.1 (sorry I mistakenly said 11.1 in the previous post. Apologies) Anyway, I too will report how things go. Interesting point on the silent release of Cataline 10.15.7 19H4 I actually liked Big Sur when I originally tried it, I just reverted back (I wish it was that easy) so I could contact support at Elgato, which has been excellent btw. They sent me a tool to run and have been very responsive and helpful.

Nov 3, 2020 5:12 AM in response to yveslaroche

Wow! This even does not work with the Apple Pro Display XDR?!?


Not that it would be an acceptable excuse at all, but given the really limited love Apple had for LG Ultrafine, despite once officially advertising it for the MBP 2016, I sadly was not surprised they do not pay much attention.


However their top of the line ultra expensive pro monitor? Does not work correctly with their top of the line 2020 notebook?? Unbelievable. #OnlyAppleCanDoThat

Nov 5, 2020 11:16 AM in response to broko_fankone

You conflate my willingness to return this computer and buy an Apple silicon Mac with indifference to whether or not they are held accountable.


They SHOULD be held accountable for this. It’s entirely unacceptable. However, my interest in Apple silicon is not about a potential fix for this. I of course want them to be held accountable and improve the quality of their product. Because net, I like their products, and I want to use better ones.

Nov 7, 2020 3:49 AM in response to broko_fankone

i have exactly the same problem described in post #1 My machine is a mbpro2020 i5 16gb 1tb. OS 10.15.7

The most annoying part is that my machine crashing with AN ORIGINAL APPLE THUNDERBOLT ADAPATER!!!

This is madness for a 3000€ machine! I am a sound engineer and I use my mb travelling around day by day. THE RELIABILITY is the FIRST things for machines used in Live events...and my BRAND NEW MacBook is absolutely unrelaiable !!!!

Please FIX this ridiculous problem. This is a PRO machine as the name suggest...plugging and unplugging devices is the basic use for a computer !

Don’t tell me that the solution is Big Sur. There’s a problem with Catalina? Fix it !


My secondary machine is a 2010 mbpro core2 and it still works like a charm.


I can only conclude that a 10 years old macbook is more relaiable than a brand new one. Pure madness.


thank you.

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MBP 13 2020 won't recognize USB devices from TB dock after sleeping and connecting to the dock. After unplugging the dock MBP crashes and does SMC reset

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