Re: Troubleshooting new USB audio device

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Caelia Chapin wrote:
> When I run alsamixer, DENON DJ MCX8000 is one of the sound cards I can
> select; when I do select it, the results depend on the kernel version.
> With older kernels, no playback or capture devices are shown for this
> card
>
>    MULTI Validity

Alsamixer does not show devices; it shows mixer controls.  Apparently,
your device does not have any useful mixer controls accessible by
software.

> When I run Mixxx and attempt to select the MCX8000 as the output
> device, the GUI pops up an "unknown error" message. But when I run
> Mixxx in debug mode, I am able to capture following more detailed
> error:
>
>    Expression 'r' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2092
>    Expression 'PaAlsaStreamComponent_FinishConfigure( &self->playback, hwParamsPlayback, outParams, self->primeBuffers, realSr, outputLatency )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2733
>    Expression 'PaAlsaStream_Configure( stream, inputParameters, outputParameters, sampleRate, framesPerBuffer, &inputLatency, &outputLatency, &hostBufferSizeMode )' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 2838

These messages come from PulseAudio.  AFAIK it has problems handling
devices that do not fit into the normal 2.0 or 5.1 schema.

Do aplay/arecord work?


Regards,
Clemens

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