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Subject: Re: M-Audio Oxygen 49: snd_uaudio cycles (loads, detaches,
	loads.... ad infinitum)
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On Friday 30 December 2011 17:45:31 Mathias Picker wrote:
> I just got an 3rd gen oxygen 49 midi master keyboard, which is class
> compliant.
> 
> Switching it on gives:
> 
> Dec 30 17:36:23 mp kernel: uaudio0: <M-Audio Oxygen 49, class 0/0, rev
> 1.00/1.00, addr 2> on usbus5
> Dec 30 17:36:23 mp kernel: uaudio0: No playback!
> Dec 30 17:36:23 mp kernel: uaudio0: No recording!
> Dec 30 17:36:23 mp kernel: uaudio0: MIDI sequencer
> Dec 30 17:36:23 mp kernel: pcm3: <USB audio> on uaudio0
> Dec 30 17:36:24 mp kernel: uaudio0: at uhub5, port 4, addr 2
> (disconnected)
> Dec 30 17:36:24 mp kernel: pcm3: detached
> Dec 30 17:36:24 mp kernel: uaudio0: <M-Audio Oxygen 49, class 0/0, rev
> 1.00/1.00, addr 2> on usbus5
> Dec 30 17:36:24 mp kernel: uaudio0: No playback!
> Dec 30 17:36:24 mp kernel: uaudio0: No recording!
> Dec 30 17:36:24 mp kernel: uaudio0: MIDI sequencer
> Dec 30 17:36:24 mp kernel: pcm3: <USB audio> on uaudio0
> Dec 30 17:36:26 mp kernel: uaudio0: at uhub5, port 4, addr 2
> (disconnected)
> Dec 30 17:36:26 mp kernel: pcm3: detached
> 
> 
> and so on. I tried a different usb port and cable, just in case, but the
> behaviour stays the same.
> 
> What can I do to get and give a more detailed error report, or even to
> fix it ;)

Hi,

There is a sysctl

hw.usb.uaudio.debug

Which you can set to 15, to enable USB audio debugging.

If the sysctl is not there you need to have "options USB_DEBUG" in your kernel 
config.

--HPS