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@gmail.com To: Joao Bonina bonina_2001@yahoo.com Cc: "alsa-devel@alsa-project.org" alsa-devel@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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