2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Clemens Ladisch commit e156ac4c571e3be741bc411e58820b74a9295c72 upstream. Fix the snd_usbmidi_create_endpoints_midiman() function, which forgot to set the out_interval member of the endpoint info structure for Midiman/ M-Audio devices. Since kernel 2.6.24, any non-zero value makes the driver use interrupt transfers instead of bulk transfers. With EHCI controllers, these random interval values result in unbearably large latencies for output MIDI transfers. Signed-off-by: Clemens Ladisch Reported-by: David Tested-by: David Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/usb/usbmidi.c | 1 + 1 file changed, 1 insertion(+) --- a/sound/usb/usbmidi.c +++ b/sound/usb/usbmidi.c @@ -1583,6 +1583,7 @@ static int snd_usbmidi_create_endpoints_ } ep_info.out_ep = get_endpoint(hostif, 2)->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK; + ep_info.out_interval = 0; ep_info.out_cables = endpoint->out_cables & 0x5555; err = snd_usbmidi_out_endpoint_create(umidi, &ep_info, &umidi->endpoints[0]); if (err < 0) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/