On Tue, Apr 07, 2015 at 04:02:27AM +0800, Tom Yan wrote: > The following error comes up frequently and some USB device fail to > show up after boot: > > xhci_hcd 0000:00:14.0: Error while assigning device slot ID > xhci_hcd 0000:00:14.0: Max number of devices this xHCI host supports is 32. > usb usb1-port13: couldn't allocate usb_device This should be fixed in newer kernels, it was quite a common error (I had it on mine.) What kernel version are you seeing this with? Can you try 3.19? 4.0-rc7? thanks, greg k-h -- 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