Re: Virtual 12 channel device

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On Wed, Mar 20, 2013 at 8:58 AM, Sheldon Hearn <sheldonh@xxxxxxxxxxxxx> wrote:
> On Tue, Mar 19, 2013 at 9:18 PM, Sheldon Hearn <sheldonh@xxxxxxxxxxxxx> 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
>
> http://www.spinics.net/lists/linux-usb/msg73869.html

Success!

I managed to unbind the HID interfaces as follows (I found the right
addresses using command-line completion and a grovel through
/sys/bus/usb/drivers/usbhid):

echo 4-2:1.3 > /sys/bus/usb/drivers/usbhid/unbind
echo 4-3:1.3 > /sys/bus/usb/drivers/usbhid/unbind

But alas, I still get the "not enough bandwidth" error.

But this got me thinking. If we're talking about such marginal tolerances...

I spent some time shuffling devices around the external USB
connectors, and eventally found a pair that reliably power both CM106
USB sound cards.

So now I have a virtual 12 channel device.

Thank you so much for your support, both for the last problem I had
(typo in asound.conf) and this time. If you're interested in video of
the art project once it's done (in May), drop me private mail. :-)

Ciao,
Sheldon.

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