Fwd: Using multiple audio interface on a UDOO board - Linux-audio-user

30 Jan 2014

On Thu, Jan 30, 2014 at 12:05 AM, Clemens Ladisch &lt;clemens(a)ladisch.de&gt;wrote;wrote:

...
  Romain Michon wrote:
  I'm trying to use two audio interfaces
(Guitar Link UC6102) in
 parallel in Alsa on a UDOO board that runs Ubuntu. The two interfaces
 are connected on the two USB 2.0 port available on the board: I'm not
 using any hub. In 20% of the cases, this works fine and I'm able to
 use the two interface as one single "virtual" interface with 4 inputs
 and 4 outputs (see my .asoundrc file bellow). 
 So the hardware actually supports the required bandwidth.

Yep...

...

  However, in 80% of the cases, this doesn't
work and dmesg says:
 "cannot submit datapipe for urb 0, error -28: not enough bandwidth". 
 Sounds like a bug in the USB controller driver of your board.

 You're right. I'll send an e-mail to the UDOO community, may be someone
had a similar issue... I'll keep you posted.

Thanks.

Romain