[alsa-devel] USB Audio device syncpipe error

[6275 kson]

Hello,

I am working on a usb audio device and I'm having trouble getting it to show
up as an output device in Ubuntu's (10.4) sound preferences.  The device is
working well with other OS's.

My syslog shows this error.
'cannot submit syncpipe for urb 0, error -90: internal error'

If someone could help me diagnose the source of the problem I would
appreciate it very much.

Here are some more details.
The device operates at high speed but uses USB Audio Class 1.0.

The output endpoint is Isochronous asynchronous and I am using a feedback
endpoint with a 32ms polling interval.

The device works with Ubuntu when running at full speed. (Input and Output
show up in the sound preferences).
At High Speed only the Input shows up in the sound preferences.