Man in a van wrote: 
> And these are the other commands :)

Full marks for diligence.

The output shows there is *no* difference in capabilties between the
hw:CARD=A and the iec958:CARD=A.
If you tried with plughw:CARD=A   not usually worthwhile, as it should
show all possible capabilities as ALSA will resample / convert any
format request from an application so that it can be played on the h/w
device.

Why plughw: results in no audio whereas iec958: got slow rate might
point to an issues about the format that OP is trying to play.

Hypothesis:
If requested format was say 192kHz/32 and device was plughw. LMS would
pass audio to standard plughw and it would accept it but ALSA buffering
might be too small to start audio.
If requested format was say 192kHz/32 and device was iec958. LMS would
do some transcoding to say 48k (perhaps incorrectly) and then iec958
would be play it but with errors due to transcoding issue.

I suggest OP provides details of format of requested audio and when
playing to iec958 - log LMS transcoding if any (i.e. player.source set
to INFO for the "song")


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