Hi, Greg! > Hm, not good. Can you enable CONFIG_USB_DEBUG and send us the kernel > logs when you plug the device in? I'm sure that Sarah will want to see > those to try to resolve this. I enabled USB debugging. This added the first three lines to the following kernel log. The same USB port works fine when under BIOS control (boot loader) - so the hardware seems to work properly. Greetings, Michael [ 19.305855] hub 3-0:1.0: state 7 ports 2 chg 0000 evt 0004 [ 19.305871] hub 3-0:1.0: port 2, status 0101, change 0001, 12 Mb/s [ 19.409033] hub 3-0:1.0: debounce: port 2: total 100ms stable 100ms status 0x101 [ 19.510758] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 19.510763] usb 3-2: Cannot reset HCD device state [ 19.510766] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 19.762041] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 19.762046] usb 3-2: Cannot reset HCD device state [ 19.762049] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 20.013319] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 20.013324] usb 3-2: Cannot reset HCD device state [ 20.013327] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 20.264604] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 20.264609] usb 3-2: Cannot reset HCD device state [ 20.264612] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 20.515883] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 20.515888] usb 3-2: Cannot reset HCD device state [ 20.515890] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 20.515893] hub 3-0:1.0: Cannot enable port 2. Maybe the USB cable is bad? [ 20.617592] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 20.617596] usb 3-2: Cannot reset HCD device state [ 20.617599] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 20.868874] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 20.868879] usb 3-2: Cannot reset HCD device state [ 20.868882] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 21.120153] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 21.120158] usb 3-2: Cannot reset HCD device state [ 21.120160] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 21.371435] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 21.371440] usb 3-2: Cannot reset HCD device state [ 21.371442] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 21.622723] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 21.622728] usb 3-2: Cannot reset HCD device state [ 21.622731] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 21.622733] hub 3-0:1.0: Cannot enable port 2. Maybe the USB cable is bad? [ 21.724431] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 21.724435] usb 3-2: Cannot reset HCD device state [ 21.724438] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 21.975701] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 21.975706] usb 3-2: Cannot reset HCD device state [ 21.975709] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 22.226983] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 22.226987] usb 3-2: Cannot reset HCD device state [ 22.226990] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 22.478271] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 22.478276] usb 3-2: Cannot reset HCD device state [ 22.478278] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 22.729555] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 22.729559] usb 3-2: Cannot reset HCD device state [ 22.729562] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 22.729565] hub 3-0:1.0: Cannot enable port 2. Maybe the USB cable is bad? [ 22.831262] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 22.831267] usb 3-2: Cannot reset HCD device state [ 22.831270] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 23.082543] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 23.082548] usb 3-2: Cannot reset HCD device state [ 23.082551] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 23.333826] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 23.333831] usb 3-2: Cannot reset HCD device state [ 23.333833] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 23.585108] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 23.585113] usb 3-2: Cannot reset HCD device state [ 23.585116] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 23.836386] xhci_hcd 0000:02:00.0: Unknown completion code 192 for reset device command. [ 23.836391] usb 3-2: Cannot reset HCD device state [ 23.836394] hub 3-0:1.0: port 2 not enabled, trying reset again... [ 23.836396] hub 3-0:1.0: Cannot enable port 2. Maybe the USB cable is bad? [ 23.836415] hub 3-0:1.0: unable to enumerate USB device on port 2 -- 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