On Thu, 6 Jan 2011, alesan@xxxxxxxxxxx wrote: > Hi I was wondering if there was any mechanism in the kernel to diagnose malfunctions in the USB connections; in particular if a hub has any non-working port or similar. Is there something 'lower level' than /sys/bus/usb/devices to check a hub's (root or physical) status? > Any possible mechanism to ensure a port is working? You can use usbmon to trace the data sent to or from a particular hub or device (see Documentation/usb/usbmon.txt). Plug a device into the port and see what messages the hub sends. Also, if you want to diagnose a host controller, you can look in the subdirectories of /sys/kernel/debug/usb/ (if your kernel was built with CONFIG_USB_DEBUG enabled). Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
