I booted 200 times, and the USB2 of the hub failed to come up three times. This happened twice: [ 7.320961] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [ 8.826673] xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command. [ 8.826690] xhci_hcd 0000:00:14.0: Assuming host is dying, halting host. [ 8.826736] xhci_hcd 0000:00:14.0: HC died; cleaning up [ 8.826781] usb 1-3.3.4-port1: couldn't allocate usb_device [ 8.826802] usb 1-3: USB disconnect, device number 2 [ 8.826809] usb 1-3.2: USB disconnect, device number 3 [ 8.827079] usb 2-3: USB disconnect, device number 2 [ 8.827088] usb 2-3.2: USB disconnect, device number 3 [ 8.827399] usb 2-3.3: USB disconnect, device number 4 [ 8.827451] xhci_hcd 0000:00:14.0: Slot 3 endpoint 2 not removed from BW list! [ 8.827458] usb 1-3.3: USB disconnect, device number 4 [ 8.827461] usb 1-3.3.4: USB disconnect, device number 6 [ 8.829160] xhci_hcd 0000:00:14.0: Slot 8 endpoint 2 not removed from BW list! [ 8.829400] xhci_hcd 0000:00:14.0: Slot 5 endpoint 2 not removed from BW list! [ 8.829408] usb 1-3.4: USB disconnect, device number 5 [ 8.829411] usb 1-3.4.1: USB disconnect, device number 7 [ 8.848552] xhci_hcd 0000:00:14.0: Slot 9 endpoint 2 not removed from BW list! [ 8.848563] usb 1-3.4.2: USB disconnect, device number 8 [ 8.918853] xhci_hcd 0000:00:14.0: Slot 10 endpoint 2 not removed from BW list! [ 8.918863] xhci_hcd 0000:00:14.0: Slot 10 endpoint 4 not removed from BW list! [ 8.919240] xhci_hcd 0000:00:14.0: Slot 6 endpoint 2 not removed from BW list! [ 8.919574] xhci_hcd 0000:00:14.0: Slot 1 endpoint 2 not removed from BW list! I haven't seen that particular error sequence before - it also resulted in `lsusb` hanging, which hasn't happened before in my testing. This happened once: [ 5.785880] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command [ 5.987246] usb 2-3: new SuperSpeed USB device number 2 using xhci_hcd [ 6.234026] usb 2-3: New USB device found, idVendor=2109, idProduct=0812 [ 6.234032] usb 2-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6.234034] usb 2-3: Product: USB3.0 Hub [ 6.234035] usb 2-3: Manufacturer: VIA Labs, Inc. [ 6.234514] hub 2-3:1.0: USB hub found [ 6.599826] usb 2-3.2: new SuperSpeed USB device number 3 using xhci_hcd [ 6.850349] usb 2-3.2: New USB device found, idVendor=2109, idProduct=0812 [ 6.850354] usb 2-3.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6.850356] usb 2-3.2: Product: USB3.0 Hub [ 6.850358] usb 2-3.2: Manufacturer: VIA Labs, Inc. [ 6.850653] hub 2-3.2:1.0: USB hub found [ 6.915317] usb 2-3.3: new SuperSpeed USB device number 4 using xhci_hcd [ 7.162238] usb 2-3.3: New USB device found, idVendor=2109, idProduct=0812 [ 7.162248] usb 2-3.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 7.162260] usb 2-3.3: Product: USB3.0 Hub [ 7.162262] usb 2-3.3: Manufacturer: VIA Labs, Inc. [ 7.162758] hub 2-3.3:1.0: USB hub found [ 7.528368] usb 2-3.3.4: new SuperSpeed USB device number 5 using xhci_hcd [ 7.772281] usb 2-3.3.4: New USB device found, idVendor=2109, idProduct=8110 [ 7.772286] usb 2-3.3.4: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 7.772288] usb 2-3.3.4: Product: USB3.0 Hub [ 7.772290] usb 2-3.3.4: Manufacturer: VIA Labs, Inc. [ 7.772744] hub 2-3.3.4:1.0: USB hub found [ 8.138772] usb 2-3.3.4.1: new SuperSpeed USB device number 6 using xhci_hcd [ 8.156285] usb 2-3.3.4.1: New USB device found, idVendor=0b95, idProduct=1790 [ 8.156304] usb 2-3.3.4.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 8.156306] usb 2-3.3.4.1: Product: AX88179 [ 8.156308] usb 2-3.3.4.1: Manufacturer: ASIX Elec. Corp. [ 8.156309] usb 2-3.3.4.1: SerialNumber: 00000000000001 [ 9.491942] ax88179_178a 2-3.3.4.1:1.0 eth0: register 'ax88179_178a' at usb-0000:00:14.0-3.3.4.1, ASIX AX88179 USB 3.0 Gigabit Ethernet, 00:0a:cd:23:d5:98 [ 9.491974] usbcore: registered new interface driver ax88179_178a [ 11.067033] usb 1-3: device descriptor read/all, error -110 -- 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