Hello all, The M-Audio Fast-Track Ultra (USB 2) is not recognized by ALSA when plugged on a USB 3 (XHCI) port on the kernel 3.9 9 I'm trying to figure out where the problem lies to report the issue to the proper team: is it with XHCI or with ALSA? In dmesg, this is what happens with the FTU is plugged: [ 107.461175] usb 3-1: new high-speed USB device number 3 using xhci_hcd [ 107.481695] usb 3-1: config 1 interface 3 altsetting 0 bulk endpoint 0x7 has invalid maxpacket 8 [ 107.481705] usb 3-1: config 1 interface 3 altsetting 0 bulk endpoint 0x87 has invalid maxpacket 8 [ 107.483384] usb 3-1: New USB device found, idVendor=0763, idProduct=2080 [ 107.483392] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 107.483398] usb 3-1: Product: Fast Track Ultra [ 107.483403] usb 3-1: Manufacturer: M-Audio [ 107.483886] xhci_hcd 0000:04:00.0: ERROR: unexpected command completion code 0x11. [ 107.483899] usb 3-1: can't set config #1, error -22 The device is seen by lsusb, but I don't think it really means much: Bus 003 Device 004: ID 0763:2080 Midiman M-Audio RunTime DFU aplay -l only doesn't show the sound card, even if I try to modprobe snd-usb-audio manually: **** List of PLAYBACK Hardware Devices **** card 0: MID [HDA Intel MID], device 0: 92HD81B1X5 Analog [92HD81B1X5 Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Generic [HD-Audio Generic], device 3: HDMI 0 [HDMI 0] Subdevices: 1/1 Subdevice #0: subdevice #0 The same FTU soundcard works on the same machine when plugged on a USB2 port (EHCI). The Edirol UA-25Ex works on this USB3 port. What do you guys think? Is the issue with XHCI or ALSA? Thanks in advance for the help! Aurélien