[alsa-devel] Alsa: USB Class 2 Audio soundcard device disappears suddenly

[Joao Bonina]

It doesn't show anything when that happens.

Looking at dmesg (I'm attaching it), it shows this:
[  350.170478] usb 1-4: config 1 has an invalid interface number: 3 but max is 2
[  350.170500] usb 1-4: config 1 has no interface number 2
[  350.170843] usb 1-4: config 1 has an invalid interface number: 3 but max is 2
[  350.170864] usb 1-4: config 1 has no interface number 2
[  350.171344] usb 1-4: New USB device found, idVendor=21b4, idProduct=0230

[  350.171366] usb 1-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  350.171385] usb 1-4: Product: Ayre USB Interface
[  350.171401] usb 1-4: Manufacturer: Ayre Acoustics
[  350.171418] usb 1-4: SerialNumber: (C) 2010 XMOS/Wavelength Audio


Don't know if those 'invalid interface number' messages are relevant for the issue.

Joao


----- Original Message -----
From: Daniel Mack <zonque at gmail.com>
To: Joao Bonina <bonina_2001 at yahoo.com>
Cc: "alsa-devel at alsa-project.org" <alsa-devel at alsa-project.org>
Sent: Tuesday, 31 July 2012, 6:24
Subject: Re: [alsa-devel] Alsa: USB Class 2 Audio soundcard device disappears suddenly

On 31.07.2012 00:32, Joao Bonina wrote:
> Hi,
> 
> I'm using an USB Class 2 Audio DAC (basically a soundcard) with my Linux box and MPD software.
> 
> It works great when playing files stored in a remote share, but when 
> playing files from an USB pen, it stops playing in a few minutes.
> 
> Mpd.log shows this:
> 
> Code:
> Jul 30 13:03 : output: "USB" [alsa] failed to play: No such device
> Jul 30 13:03 : output: closed plugin=alsa name="USB"
> ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
> Jul 30 13:03 : output: Failed to open "USB" [alsa]: Failed to open ALSA device "hw:0,0": No such file or directoryIt seems to be somewhat related to the USB bus not being able to 
> cope with both PCM streaming to the soundcard and reading from the flash pen simultaneously, I guess.
> 
> So, anybody faced this issue previously and can provide some hints to solve this?
> 
> MPD is 0.17, kernel is 3.2.17, alsa-utils is 1.0.25.

Does the kernel log or 'dmesg' show anything weird what that happens?


Daniel

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