here is a summary of the facts that I found so far regarding the optical SPDIF output on my Abit NF7 nforce2 main board:
Alsa Nvidia driver driver Default setting plays sound on analog output Yes Yes Default setting plays sound on digital output No Yes Sound works on both (D and A) outputs at the same time No Yes kde desktop sounds work on digital output No Yes mpg123 works on digital output No Yes(1) mpg321 works on digital output Yes(2) Yes(3) main volume slider controls volume on digital output No Yes PCM volume slider controls volume on digital output No Yes Digital output can be muted by mixer application No Yes
(1) Requires -r 48000 parameter unless file contains 48 kHz data. (2) Requires -o alsa09 --audiodevice hw:0,1 parameters or an entry in ~/.asoundrc that makes device 1 the default. Sound is played at wrong speed unless data is 48kHz. (3) Only if file contains 48 kHz data.
Carsten.
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