Kernels somewhere around 2.6.35 could handle USB 3.0 at random sometimes, but kernel 3.8.0 fails consistently. I know I should try to bisect this, but I don't have time and the randomness of the older kernel doesn't help. lspci: 0d:00.0 USB controller [0c03]: NEC Corporation uPD720200 USB 3.0 Host Controller [1033:0194] (rev 04) Kernel driver in use: xhci_hcd lsusb: Bus 007 Device 002: ID 152d:0539 JMicron Technology Corp. / JMicron USA Technology Corp. dmesg: [ 458.857081] usb 6-1: new high-speed USB device number 2 using xhci_hcd [ 463.857085] xhci_hcd 0000:0d:00.0: Timeout while waiting for address device command [ 464.728073] xhci_hcd 0000:0d:00.0: Stopped the command ring failed, maybe the host is dead [ 464.728073] xhci_hcd 0000:0d:00.0: Host not halted after 16000 microseconds. [ 464.728073] xhci_hcd 0000:0d:00.0: Abort command ring failed [ 479.976010] [sched_delayed] sched: RT throttling activated [ 479.987230] xhci_hcd 0000:0d:00.0: HC died; cleaning up -- 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