On Thu, Jan 30, 2014 at 12:05 AM, Clemens Ladisch <clemens@xxxxxxxxxx> wrote:
Romain Michon wrote:So the hardware actually supports the required bandwidth.
> 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).
Yep...
Sounds like a bug in the USB controller driver of your board.
> However, in 80% of the cases, this doesn't work and dmesg says:
> "cannot submit datapipe for urb 0, error -28: not enough bandwidth".
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
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