The hw setup: NEC based controller, device directly attached to the embedded hub. The device is reset via libusb_reset_device(). The kernel log (master is at f878133, dynamic debug enabled for xhci and usbcore), shows this: Feb 8 16:35:33 localhost kernel: usb 9-2: reset SuperSpeed USB device using xhci_hcd and address 16 Feb 8 16:35:33 localhost kernel: xhci_hcd 0000:03:00.0: WARN: short transfer on control ep Feb 8 16:35:33 localhost kernel: usb 9-2: config index 0, error 27 Feb 8 16:35:33 localhost kernel: usb 9-2: device firmware changed Feb 8 16:35:33 localhost kernel: hub 9-0:1.0: logical disconnect on port 2 Feb 8 16:35:33 localhost kernel: hub 9-0:1.0: state 7 ports 4 chg 0004 evt 0000 Feb 8 16:35:33 localhost kernel: hub 9-0:1.0: port 2, status 8103, change 0000, 5.0 Gb/s Feb 8 16:35:33 localhost kernel: usb 9-2: USB disconnect, address 16 Feb 8 16:35:33 localhost kernel: usb 9-2: unregistering device Feb 8 16:35:33 localhost kernel: usb 9-2: unregistering interface 9-2:1.0 Feb 8 16:35:33 localhost kernel: usb 9-2: unregistering interface 9-2:1.1 Feb 8 16:35:33 localhost kernel: usb 9-2: usb_disable_device nuking all URBs Feb 8 16:35:33 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:33 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:33 localhost kernel: usb 9-2: device not accepting address 17, error -71 Feb 8 16:35:33 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:33 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:33 localhost kernel: usb 9-2: device not accepting address 18, error -71 Feb 8 16:35:33 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:34 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:34 localhost kernel: usb 9-2: device not accepting address 19, error -71 Feb 8 16:35:34 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:34 localhost kernel: usb 9-2: Device not responding to set address. Feb 8 16:35:34 localhost kernel: usb 9-2: device not accepting address 20, error -71 Feb 8 16:35:34 localhost kernel: hub 9-0:1.0: unable to enumerate USB device on port 2 Feb 8 16:35:36 localhost kernel: hub 9-0:1.0: hub_suspend Feb 8 16:35:36 localhost kernel: usb usb9: bus auto-suspend The USB bus trace shows: 0) hot reset (TS1/2) 1) SET ADDRESS to addr 0, new address 1. Now the device's got address 1. 2,3) GET DESC device... 4) GET CONFIG 5) SET ADDRESS to addr 0, new address 1. <-- problem. In HS mode, the 2nd SET ADDRESS is not observed, unless of course immediately after a bus reset, but not out of the blue like what's shown above. Also the data packet shows that the "new address" is 1 and not 18, 19, etc. as shown in the kernel log above. Anyone seen this (observed only in SS, HS is fine)? Is there a fix for this in the trunk since f878133b? Luben -- 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