30 Jan
2014
30 Jan
'14
9:06 a.m.
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.
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.
Regards,
Clemens