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Book doctor Appointment with
Dr Shalini Janardhan
in Apollo Hospitals
Chennai
Chennai
অ্যাপোলো হাসপাতালে
Dr Shalini Janardhan
এর অ্যাপয়েন্টমেন্ট বুক করুন
Dr. Shalini Janardhan is a specialist in Mental Health and Behavioral Sciences, known for her expertise in psychological therapies. She has handled numerous complex medical cases and is recognized for her attention to detail, accurate diagnosis, and empathetic patient care.
$ usbutil monitor ** (usbutil:1234): DEBUG: 15:32:01.045: Device added at 0x14130000 (vid:0x0781 pid:0x5583) ** (usbutil:1234): DEBUG: 15:32:05.123: Device removed at 0x14130000 Press Ctrl+C to stop monitoring. This produces a massive, highly technical dump of the USB host controller state, including endpoint descriptors, transfer speeds, and I/O Kit registry entries. It is primarily used by Apple engineers or kernel debuggers. 4. Reset a USB Port ( usbutil reset-port ) When a device becomes unresponsive (e.g., a USB audio interface stops streaming or a flash drive fails to mount), you can reset the specific port without restarting your Mac.
Unlike its Linux counterpart ( lsusb ), macOS does not ship with a dedicated lsusb command. Instead, Apple provides usbutil —a lightweight but powerful tool for examining the USB bus hierarchy, testing device connections, and diagnosing kernel-level USB issues. usbutil is a native macOS executable located in /usr/sbin/usbutil . It interacts directly with the AppleUSBHostController and the I/O Kit framework. While average users will never need it, developers, firmware engineers, and IT support specialists can leverage it to inspect device descriptors, reset USB ports programmatically, or monitor USB power events. Key Commands and Their Usage To use usbutil , open Terminal and type usbutil followed by a subcommand. Below are the most valuable options available as of macOS Ventura and Sonoma (14/15). 1. List Devices ( usbutil list-devices ) This is the closest equivalent to lsusb . It prints a hierarchical tree of all attached USB devices, including hubs, internal components (camera, Bluetooth controller), and external peripherals. usbutil for mac
First, identify the location ID (the hex value under Location ID in System Information). Then run: $ usbutil monitor ** (usbutil:1234): DEBUG: 15:32:01
USB Device Tree (0x10000035a): +-+ Root Hub @ 0x14000000 (AppleUSB20InternalHub) +-- FaceTime HD Camera @ 0x14300000 (AppleUSBDevice) +-- Bluetooth USB Host Controller @ 0x14200000 (Broadcom) +-- External USB 3.0 Hub @ 0x14100000 (VIA Labs, Inc.) +-- SanDisk Ultra Fit @ 0x14130000 (SanDisk) Use the -v flag for verbose output, which reveals device IDs, vendor/product strings, and current power state. This command listens for USB connection and disconnection events in real-time. It is invaluable for debugging erratic devices or testing driver reload behavior. viewing basic USB device lists
usbutil power status usbutil power off 0x14130000 For everyday tasks—ejecting drives, viewing basic USB device lists, or checking transfer speeds— usbutil is overkill and potentially dangerous. Use diskutil list , system_profiler SPUSBDataType , or the Disk Utility app instead.
When most Mac users need to interact with USB devices, they turn to the graphical System Information app (formerly System Profiler) or the system_profiler SPUSBDataType command in Terminal. However, buried deep within macOS is a lesser-known, command-line utility designed specifically for lower-level USB debugging and device management: usbutil .
sudo usbutil reset-port 0x14130000 Note: This requires sudo and must be used carefully; resetting the wrong port can disrupt keyboard/mouse input. On laptops, you can query or toggle power to individual USB ports (e.g., to conserve battery or force a hard reset). Example:
$ usbutil monitor ** (usbutil:1234): DEBUG: 15:32:01.045: Device added at 0x14130000 (vid:0x0781 pid:0x5583) ** (usbutil:1234): DEBUG: 15:32:05.123: Device removed at 0x14130000 Press Ctrl+C to stop monitoring. This produces a massive, highly technical dump of the USB host controller state, including endpoint descriptors, transfer speeds, and I/O Kit registry entries. It is primarily used by Apple engineers or kernel debuggers. 4. Reset a USB Port ( usbutil reset-port ) When a device becomes unresponsive (e.g., a USB audio interface stops streaming or a flash drive fails to mount), you can reset the specific port without restarting your Mac.
Unlike its Linux counterpart ( lsusb ), macOS does not ship with a dedicated lsusb command. Instead, Apple provides usbutil —a lightweight but powerful tool for examining the USB bus hierarchy, testing device connections, and diagnosing kernel-level USB issues. usbutil is a native macOS executable located in /usr/sbin/usbutil . It interacts directly with the AppleUSBHostController and the I/O Kit framework. While average users will never need it, developers, firmware engineers, and IT support specialists can leverage it to inspect device descriptors, reset USB ports programmatically, or monitor USB power events. Key Commands and Their Usage To use usbutil , open Terminal and type usbutil followed by a subcommand. Below are the most valuable options available as of macOS Ventura and Sonoma (14/15). 1. List Devices ( usbutil list-devices ) This is the closest equivalent to lsusb . It prints a hierarchical tree of all attached USB devices, including hubs, internal components (camera, Bluetooth controller), and external peripherals.
First, identify the location ID (the hex value under Location ID in System Information). Then run:
USB Device Tree (0x10000035a): +-+ Root Hub @ 0x14000000 (AppleUSB20InternalHub) +-- FaceTime HD Camera @ 0x14300000 (AppleUSBDevice) +-- Bluetooth USB Host Controller @ 0x14200000 (Broadcom) +-- External USB 3.0 Hub @ 0x14100000 (VIA Labs, Inc.) +-- SanDisk Ultra Fit @ 0x14130000 (SanDisk) Use the -v flag for verbose output, which reveals device IDs, vendor/product strings, and current power state. This command listens for USB connection and disconnection events in real-time. It is invaluable for debugging erratic devices or testing driver reload behavior.
usbutil power status usbutil power off 0x14130000 For everyday tasks—ejecting drives, viewing basic USB device lists, or checking transfer speeds— usbutil is overkill and potentially dangerous. Use diskutil list , system_profiler SPUSBDataType , or the Disk Utility app instead.
When most Mac users need to interact with USB devices, they turn to the graphical System Information app (formerly System Profiler) or the system_profiler SPUSBDataType command in Terminal. However, buried deep within macOS is a lesser-known, command-line utility designed specifically for lower-level USB debugging and device management: usbutil .
sudo usbutil reset-port 0x14130000 Note: This requires sudo and must be used carefully; resetting the wrong port can disrupt keyboard/mouse input. On laptops, you can query or toggle power to individual USB ports (e.g., to conserve battery or force a hard reset). Example:
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