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.

I have the same issue with my MacBook Pro M2 Max 64GB RAM and monitor Dell U3219Q; none of the USB peripherals connected to the Monitor's USB hub work.

On the contrary, all peripherals work fine when I attach a Windows computer to the Dell Monitor. In addition, I check every USB peripheral by attaching them directly to the Mac, and of course, they are working.

I rebooted the Mac and detached the power plug from the Monitor, trying any configurations or sequences of rebooting as possible. Nothing is working since the update to Sonoma 14.4

Please, Apple, jump in and fix this issue soon.

14.4.1 did not correct problem. I did not have the problem before 14.4.1.

Apple is aware of the issue and a fix in the form of an upcoming 14.4.1 update is actually in the works.

It is the worst update ever. It destroyed my entire flow.

I must undock my Macbook and ping-pong between stopping the monitor, connecting, and reconnecting the cables.

It is a nightmare. Before the update, I had to plug my setup into a Macbook using one cable, and that's it.

Please fix this!

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.

This is a f**ing nightmare.

Since the upgrade, my usb-c hub still works when connected to the M2 macbook Air.

The power goes in, the additional screen works fine via HDMI.

BUT... the Apple USB2 keyboard is not recognized anymore. So I've tried connecting it via an Apple USB-C <=> USB2 adapter and even there it doesn't work!!

I've tried all the suggestions and... it worked, twice! For example yesterday, miracle, things worked. And this morning, not anymore. I don't manage to find out what changed, but today I tried many different procedures again and it won't recognize the keyboard anymore.

This is so annoying that an upgrade creates such issues.

Apple, post a fix NOW!!!

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.

14.4.1 did not fix the issue for me

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.

Interesting discovery here after doing some testing.

Basically same issue for me, except I have three LG monitors connected via TB3 cable directly to the MacBook Pro 14" M2 Max. It seems in my case, whichever monitor I connect first will get its USB hub recognized and connected, while the subsequent two will simply not have their USB hubs detected.

It's as if only a single external USB hub can be connected to the MacBook, and once that's been connected, no additional ones will be accepted.

I guess I'll be opening a support ticket for this...

Start by disconnecting and reconnecting the Thunderbolt 3 cable that connects your MacBook to your monitor. Sometimes, simply re-establishing the connection can help resolve connectivity issues.

Next, try restarting both your MacBook and your monitor. Restarting can sometimes clear out any temporary software glitches that may be causing the problem.

If that doesn't work, check the System Information on your MacBook to see if it detects the USB hub on your monitor. You can do this by going to the Apple menu > About This Mac > System Report. Under the Hardware section, click on USB. If your monitor's USB hub is listed here, it means that your MacBook recognizes it, and the issue may be with the peripherals themselves or their connections.

If your monitor's USB hub isn't listed in the System Information, there may be an issue with the Thunderbolt connection or the monitor itself. In this case, try connecting your peripherals directly to your MacBook's USB ports to see if they work. If they do, the issue likely lies with the USB hub on your monitor.

If none of these steps resolve the issue, it's possible that the macOS update may have introduced a compatibility issue with your monitor's USB hub. In that case, you may need to reach out to Official Apple Support for further assistance or consider contacting the manufacturer of your monitor for any available updates or troubleshooting steps specific to your model.

I have the same issue. After the latest sonoma update, the usb hub of my Gigabyte M32u stopped working. Everything worked nice and smooth before, now I had to switch using external usb hub. Really dissapointing.