After Sonoma 14.4 update USB hub not working on MacBook

I had the same issue with an LG monitor connected by USB3 -- the mouse plugged into the USB hub on the monitor didn't work after the 14.4 upgrade.

Rebooting, reconnecting wires, etc, didn't help.

However, this worked:

1. System Settings->Privacy&Security->Allow accessories to connect->Ask every time
2. Turn off monitor (at the wall is best) and disconnect it
3. Reboot
4. Reconnect the monitor then turn it on.

At this point I got a popup asking if I agreed to the assessory and I answered yes. Since then the mouse works fine. Hopefully it will stay that way.

Changing the allow usb devices to connect to always and then changing back to ask for new devices solved my issue. , Under system settings -> privacy and security -> allow accessories to connect.

I got Sonoma to prompt the "Allow accessories to connect" by

1. open the laptop lid
2. disconnect the display usb-c cable
3. change the "Allow accessories to connect" setting to "always ask"
4. logout the user
5. log back in
6. reconnect the display usb-c cable
7. now Sonoma should prompt for the permission

I also noticed, that if I then close the laptop lid, disconnect the cable and plug it back in, Sonoma forgets the setting and the USB hub stops working again.

Folks are pointing out that the issue started with Sonoma 14.4. In aggregate they are pointing out that it happens with various devices attached via usb to an external hub attached by usbc to the Mac (this issue is not specific to a particular external hub, or a particular brand but specific to Mac running Sonoma 14.4). They are also pointing out that the same issue, with exactly the same hardware cannot be reproduced when using pre Sonoma 14.4 OS (so we are not dealing with malfunctioning external hubs).

The issue happens when Mac comes out of sleep or when the hub is disconnected and then connected back. The only way to fix it is make the hub do a hard reboot (disconnect from Mac, disconnect from power completely). All of this is more pronounced in hubs that are built into the monitored or attached to their own power supply as the "fix" requires going and plugging the power cable out of the monitor or hub.

I just spoke with a Senior Advisor at Apple about this issue.

My setup: wired mechanical keyboards (I have about a dozen) connected to my iogear GUS432 KVM connected to my LG 38WK95C display's USB hub connected via USB-C to my 14" M1 Pro MacBook Pro.

My flavor of this issue: the other 3 peripherals connected to my KVM - mouse, mic and webcam - all work fine. It's only my keyboards that don't when connected via the KVM. Also, my keyboards work normally when connected via KVM to the other machine on the KVM - a Windows-based Intel NUC. Finally, the few keyboards I have that can also connect wirelessly via Bluetooth work fine over Bluetooth, just not in wired mode via the KVM.

We ruled out the LG display's USB hub by connecting the KVM directly to the MBP so that the connectivity is like-for-like with the Windows machine. Still no dice. I also tried the Settings > Privacy & Security > Allow accessories to connect: always settings change, with no luck.

The SA said that most likely there was a security vulnerability that was addressed in 14.4 and that in such cases where third-party peripherals are at play Apple typically won't send these cases up to Engineering. My options are to either downgrade the machine, which requires a complete reinstall, or to reach out to iogear as manufacturers will need to conduct their own testing and if they find this to be a big enough problem, they have more clout with Apple than you or I as individual customers.

This truly sucks. I've been happily using this KVM for 2 years.

Hello everyone,

macOS Sonoma 14.4.1 just dropped. It fixes the USB hub issues.

Good grief ! I didn't have a problem before with 14.1 but now after installing 14.4.1, my M2 MacBook Air no longer recognises my keyboard attached to the hub on a Dell U3219Q display connected by USB-C, even after multiple reboots. I didn't have a problem with 14.4 so instead of fixing the problem, 14.4.1 seems to have created the problem for me !

[Update - so looks like the problem has to do with the "allow accessories to connect" setting. I had to change the setting to "Ask Every time" so that the next time I connected the monitor, I had to give it permission for it to connect. After that I changed the setting back to "Ask for new accessories" and it continues to work even after unplugging the monitor and plugging it back.

I have one bluetooth and one USB keyboard so it's possible that immediately after upgrading to 14.4.1 I had answered "no" to allowing the USB keyboard to connect. Alternatively, Sonoma 14.4/14.4.1 has trouble keeping track of devices that have been connected through a hub and forgot that I had already approved the keyboard before the upgrade. ]

Macbook Pro M2, monitor Dell ultrasharp 34. I tried everything, from factory resetting the monitor to reinstalling OS. Nothing worked UNTIL I unplugged the monitor, not just shutting it down, and then plugged it in again. Voila, USB-hub in the monitor up and running again.

I just spoke with a Senior Advisor at Apple about this issue.

My setup: wired mechanical keyboards (I have about a dozen) connected to my iogear GUS432 KVM connected to my LG 38WK95C display's USB hub connected via USB-C to my 14" M1 Pro MacBook Pro.

My flavor of this issue: the other 3 peripherals connected to my KVM - mouse, mic and webcam - all work fine. It's only my keyboards that don't when connected via the KVM. Also, my keyboards work normally when connected via KVM to the other machine on the KVM - a Windows-based Intel NUC. Finally, the few keyboards I have that can also connect wirelessly via Bluetooth work fine over Bluetooth, just not in wired mode via the KVM.

We ruled out the LG display's USB hub by connecting the KVM directly to the MBP so that the connectivity is like-for-like with the Windows machine. Still no dice.

The SA said that most likely there was a security vulnerability that was addressed in 14.4 and that in such cases where third-party peripherals are at play Apple typically won't send these cases up to Engineering. My options are to either downgrade the machine, which requires a complete reinstall, or to reach out to iogear as manufacturers will need to conduct their own testing and if they find this to be a big enough problem, they have more clout with Apple than you or I as individual customers.

This truly sucks. I've been happily using this KVM for 2 years.

I had a similar issue with the latest Sonoma update 14.4.1. I was using “pass through power” via a USB C hub that had my HDMI, 1 x 4TB SSD, 1 x 5TB spinning disk & supplying power to a USB C Port for syncing iPads. They all failed to work once the update was applied. A support call to Apple found that “Electron paramagnetic resonance“ was the blame. The latest patch will not let you use pass through power is the output of the hub is “questioned” by the OS. I went back to using the Mag Safe power adapter and the hubs now work. I also found out that Apple support was notified ~March 27th 2024 of this restriction.

My USB hub with SSD was not working after the 14.4.1 update on my M2 Mac Mini. It was working on 14.4 but the “bug” update apparently caused it to stop being recognized. What worked for me is I shut it down and unplugged everything and then started up the Mac Mini without the USB Hub plugged in. I plugged it in waited a while and it was finally recognized again.

How are you powering the MacBook? Are you using MagSafe or connecting a USB C cable to the power supply and pass through the hub? I posted this earlier:

"I had a similar issue with the latest Sonoma update 14.4.1. I was using “pass through power” via a USB C hub that had my HDMI, 1 x 4TB SSD, 1 x 5TB spinning disk & supplying power to a USB C Port for syncing iPads. They all failed to work once the update was applied. A support call to Apple found that “Electron paramagnetic resonance“ was the blame. The latest patch will not let you use pass through power is the output of the hub is “questioned” by the OS. I went back to using the Mag Safe power adapter and the hubs now work. I also found out that Apple support was notified ~March 27th 2024 of this restriction."

Changing:

System Settings->Privacy&Security->Allow accessories to connect->

to: automatic if unlocked

fixed the issues on my setup after reconnecting the monitors. Not the best way but working for now

I was able to fix this! My usb hub stopped working after Sonoma upgrade so based on other comments, I unplugged my hub, restarted the Mac, then plugged the hub back in. Like a miracle, my usb hub and all items were now recognized. Please give that a try. Good luck.

14" MBP M2 Max

After upgrading to 14.4.1 my (2) LG 4K displays no longer connect via USB-C. I've reset NVRAM, restarted, changed the 'Allow accessories to connect' option, powered off displays, etc, but I'm not being prompted at all to accept new devices. I didn't have this issue with 14.4.

Frustrating...

Update, tried it again and was able to get it working. Had to power off the monitors and leave them off for 5 minutes. Allow accessories to connect is set to "Always". Changing it back to "Ask for New Accessories now.