13.2.1 USB-C hub stopped working after 13.2.1

I was able to fix the issue with some kind of magic sequence of plugging in and off the monitor :).

I did:

1. Plug off the usb-c cable from MacBook
2. Turn off the monitor completely
3. Shutdown the MacBook
4. Turn on the MacBook
5. Plug in Monitor usb-c cable into MacBook
6. Turn on the monitor again

After that sequence, MacBook found an external display and it started working.

This comment made me realize that I never actually power-off my monitor. When I unplug my laptop, it immediately goes to sleep, but it's not fully powered off.

So I turned off the monitor, using the power switch, and let it sit for 30 minutes. When I powered on and reconnected my MacBook Pro, the USB-A ports on the monitor worked again! We'll see how long it lasts.

Greetings danrich03,

Since you are having issues with USB ports, it'd be best to start with this information:

"Check the power, port, and cable connections: Make sure the USB device is turned on and its cables are properly connected. If your computer has more than one USB port , switch the device’s cable to another port. If you still can’t use the device, contact the manufacturer for more information.

If you can use the device after switching ports, connect another device to the first port. If you can’t use this device, shut down the computer and unplug it from the power outlet. Wait about a minute, then plug it back into the power outlet and start up your computer.

If you still can’t use a device with the port, your computer may need to be serviced. See Find out how to service or repair your Mac.

Check for missing software: Make sure you installed the latest software for your device. Visit the manufacturer’s website for any updates.

Check the USB hub: If the device is connected to a USB hub, make sure the device and the hub are the same speed. Connect USB 3.0 SuperSpeed devices to a USB 3.0 SuperSpeed HUB, USB 2.0 Hi-Speed devices to a USB 2.0 Hi-Speed hub, and so on.

If the device doesn’t have a power cord and is plugged into another USB device that doesn’t have a power cord: Try plugging the device directly into your computer’s USB port  or into a USB device that does have a power cord. You might need to disconnect and reconnect the other device as well, if it has stopped responding.

If you have many devices connected to your Mac: Disconnect all USB devices except the device you’re testing, an Apple keyboard, and an Apple mouse. Make sure that the device is connected directly to the computer, and that any hubs or extension cables are disconnected. If you can use the device now, the problem may be with one of the other USB devices or hubs you had connected to your computer. Try reconnecting them, one by one, to your computer. When you find the device causing the problem, review its documentation for further troubleshooting steps.

Verify that the device appears in System Information: On your Mac, press and hold the Option key, then choose Apple menu  > System Information.

In the window that appears, see if the USB device is listed below Hardware in the list on the left. If the device appears but does not work, review the device’s documentation for further troubleshooting steps.

Reopen apps: Quit and reopen any apps that use the device.

Restart your Mac: Choose Apple menu  > Restart." If a USB device doesn’t work with Mac

If the issue continues, you'd want to reach out to the display manufacturer for additional guidance.

Best wishes.

I have this exact issue happening.

I have an LG 27-inch 4K Ultrafine (27UN880-B). It has 2 USB-A ports which have stopped working after updating to 13.2.1. The monitor itself is still working fine, with signal from laptop coming-in via USB-C. Monitor and webcam on the USB-A ports immediately stopped working. If I move either one to a USB port on the laptop, or on my external USB-C dock, they work fine. So annoying.

I have rebooted several times, but to no avail.

I did have this exact thing happen once before, with a point release on Monterey, and then resolved itself after the next point release. Which means we may just have to wait, and hope Apple catches it in the next update.

Same thing. Worked fine until I thought to install new updates last day and now I'm wondering why nothing works. Spent like 2 hours plugging cables in and out before I gave up. Can't believe you guys have the same issue since Februar and nothing changed since then.

My monitor stopped even working via usb-c after the upgrade to 13.2.1...

Just installed Ventura 13.3, and unfortunately, for me, it does not fix this problem. Same issue as before: USB-A ports on external monitor do not work.

Good to hear that. For me it's working since Friday, so looks like that solved the strange behaviour :)