Kernel: v4.0-10710-g27cf3a1 Hardware: IvyBridge Macbook (Panther Point PCH), 2 external USB3 ports AmazonBasics 10 Port USB 3.0 Hub (3x VIA VL812 hub controllers) Bug: In ~7%-10% of boots there is an error: [ 0.604801] xhci_hcd 0000:00:14.0: Bad Slot ID 2 [ 0.604802] xhci_hcd 0000:00:14.0: Could not allocate xHCI USB device data structures [ 0.604805] usb usb1-port3: couldn't allocate usb_device When this happens, no USB2 devices will be detected on the hub - the three USB2 hub controllers (2109:2812) from the hub are not detected. This problem does not seem to occur in OS X: on 60 boots the USB2 devices appeared every time. -- 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