With 3 series kernels (this dmesg output is from 3.3.0-rc4) I get "xHCI host not responding to stop endpoint command" when accessing an external 1 TByte hard drive on a ASUS M5A97 pro USB3 port. The drive performs ok when used with a USB2 port. Please advise. Thanks NTFS volume version 3.1. xhci_hcd 0000:04:00.0: xHCI host not responding to stop endpoint command. xhci_hcd 0000:04:00.0: Assuming host is dying, halting host. xhci_hcd 0000:04:00.0: HC died; cleaning up usb 6-1: USB disconnect, device number 2 sd 11:0:0:0: Device offlined - not ready after error recovery -- 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