Re: Need help to debug USB audio problem (Burr-Brown DAC + garbled sound)

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Samuel Gilbert wrote:
> - Sound is never crystal clear
> 
> - A ramdom amount of time after having the sound starts to degrade.

What kind of degrdation?

> - When I stop the playback, I get an error message in dmesg :
> [ 2211.734042] ALSA sound/usb/usbaudio.c:923: timeout: still 3 active urbs..
> [ 2211.734061] ALSA sound/usb/usbaudio.c:871: cannot submit datapipe for urb 0, error -22: internal error
> [ 2216.766358] usb 3-2: amarokapp timed out on ep0out len=0/0

This might indicate a software problem, most likely in the USB
controller driver.  Try connecting through a hub, or not.

> What can I do to identify if the problem is related to the hardware, the
> driver or the lib?

It's unrelated to lib.  What kernel versions have you tried?

> The fact that my USB sound card still works flawlessly on 
> my old computer

... might indicate that one has an OHCI controller and the other one
UHCI.  Apparently, the driver for one of them is buggy.


Best regards,
Clemens

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