[alsa-devel] iec958 switch uneffective while playing ac3 stream

Dominique Dumont domi.dumont at free.fr
Fri Mar 30 18:57:39 CEST 2007

Dag Lem <dag at nimrod.no> writes:

> Did you try my workaround cookbook?
> 1. Turn off IEC958 in alsamixer.
> 2. Play and interrupt a 44.1kHz PCM with aplay.
> 3. Turn on IEC958 in alsamixer.
> 4. Play AC3 stream.

Yes ! It works !

Now I have a lead ( and a trace of all verbs sent to the codec).

> I have also read while googling that the "WAV volume" in Windows
> drivers must be set to max in order for S/PDIF output to work. I
> assume this is the same as PCM volume in ALSA.

Currently, it works while PCM is at 82 (according to alsamixer)

Thanks for the tip.

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