Setting up USB correctly requires mapping your ports to stay within macOS limits.
Step 1 — Understand the 15-Port Limit
macOS limits each USB controller to 15 ports. A USB 3.0 port counts as two (one USB 2.0 + one USB 3.0).
Step 2 — Map Your USB Ports
Use USBToolBox or USBMap to identify which physical ports correspond to which internal port numbers.
Step 3 — Create a USB Map Kext
Generate a USBMap.kext with only the ports you need. Remove USBInjectAll.kext once your map is in place.
Step 4 — Verify in System Information
Open System Information > USB and confirm all expected devices appear.
Expected Results
- All needed USB ports recognise devices
- USB 3.0 ports achieve expected transfer speeds
- No kernel panics when plugging/unplugging devices
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Original Question: "How do I select a webcam interface manually?"
I tested my webcam on Ubuntu and it showed me TWO interfaces: /dev/video0 works, but /dev/video1 doesn't work, and I guess the latter one is the interface macOS takes. And I think that's the problem I'm facing these months.
So, my question is how should I make macOS to use the interface that works?
Thanks in advance.
My laptop is an Asus ZenBook UX431FA, and the webcam is shown as USB2.0 HD UVC WebCam. On Linux there are two of them using guvcview.
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