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

Daniel Mack zonque at gmail.com
Tue Jul 31 07:24:49 CEST 2012

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?


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