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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