Getting S/PDIF output working

Alan Nicoll alannicoll at
Wed Jul 7 19:51:12 UTC 2010

PROBLEM: No sound coming out of my Denon Receiver that is hooked to my pc
via optical cable connected to the S/PDIF port.  If I set the system up to
output to speakers connected to the green port I can get sound.

Athlon 64x2 processor
ASUS M4A78L-M motherboard
[root at NN nck]# cat /proc/asound/cards
 0 [SB             ]: HDA-Intel - HDA ATI SB
                      HDA ATI SB at 0xfe8f4000 irq 16
 1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xfeae8000 irq 26
[root at NN nck]# uname -r
[root at NN nck]# uname -a
Linux NN.FRONT #1 SMP Thu May 6 18:09:49 UTC 2010
x86_64 x86_64 x86_64 GNU/Linux
[root at NN nck]# uname -m

      Fedora 13_64, fully updated.

Hovering the mouse over the speaker icon in the top bar shows "Output 100%;
0.0db, RS780 Azalia Controller Digital Stereo (HDMI) so I am assuming that
is the default sound output.
I went into alsamixer and muted everything except the SPDIF bars in both

I test the system by opening sound preferences, hardware tab, selecting the
RS780 Azalia controller and running the Test Speakers app.  I do not get any
sound.  I have my Denon set to Aux, 0db and Aux is set to Optical 1 and that
port is connected to my pc.  I can see light coming from the end of the
cable when the pc is on.

    I have been working this problem since 1JUL10.  I first installed
MythDora 12 and learned a lot about alsa, drivers, mixers and linux sound
then started over from scratch with Fedora 13.  I quickly got to the same

"Open source costs time instead of money."
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