The following events cause the USB hub driver to enumerate a USB device as an unknown device: The device has a Device ID of USB\VID_0000&PID_0000 and a Hardware ID and Compatible ID of USB\UNKNOWN. Typically when the USB driver stack fails to enumerate a device, the hub driver still reports the arrival of the device to Windows and the USB device is marked as an unknown device in Device Manager. For information on USB enumeration, see the blog post titled How does USB stack enumerate a device? To debug an unknown USB device problem, it helps to understand what the USB driver stack does to enumerate a device when a user plugs it into the system. After the device appeared as an unknown device, we stopped the trace. To diagnose further, we unplugged the device, began an ETW trace, and plugged in the device again. This topic provides an example of how to use USB ETW and Netmon to troubleshoot a USB device that Windows does not recognize.įor this example, we plugged in a device and it appeared as an unknown device in Device Manager and other parts of the user interface (UI).
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