Re: [Alsa-user] Virtual 12 channel device

SourceForge Headquarters 225 Broadway Suite 1600 San Diego, CA 92101 +1 (858) 454-5900

On Tue, Mar 19, 2013 at 9:18 PM, Sheldon Hearn <she...@st...> wrote:
> Mar 19 18:39:39 wrox kernel: [  616.451607] ALSA sound/usb/endpoint.c:874 cannot submit urb 0, error -28: not enough bandwidth
> Mar 19 18:39:39 wrox kernel: [  616.453600] ohci_hcd 0000:00:12.1: leak ed ffff8800cf81f870 (#06) state 2

I found this old luinux-usb post, that suggested it might help to
disable the HID control on the USB sound cards:

http://www.spinics.net/lists/linux-usb/msg73869.html

However, I can't figure out how to address the HID control (i.e. what
echo argument to use) in my case. My lsusb -t looks like this:

/:  Bus 09.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 5000M
/:  Bus 08.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/2p, 480M
/:  Bus 07.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/2p, 12M
/:  Bus 06.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
    |__ Port 2: Dev 2, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 2: Dev 2, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 2: Dev 2, If 2, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 2: Dev 2, If 3, Class=Human Interface Device, Driver=usbhid, 12M
    |__ Port 3: Dev 3, If 0, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 3: Dev 3, If 1, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 3: Dev 3, If 2, Class=Audio, Driver=snd-usb-audio, 12M
    |__ Port 3: Dev 3, If 3, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 5, If 0, Class=Human Interface Device,
Driver=usbhid, 1.5M
        |__ Port 1: Dev 5, If 1, Class=Human Interface Device,
Driver=usbhid, 1.5M
        |__ Port 2: Dev 6, If 0, Class=Human Interface Device,
Driver=usbhid, 12M
        |__ Port 2: Dev 6, If 1, Class=Human Interface Device,
Driver=usbhid, 12M

I tried "echo 4-1.1:2.3 > /sys/bus/usb/drivers/usbhid/unbind" but got
"No such device".

Ciao,
Sheldon.