[Alsa-user] Cannot hear S/PDIF-In real-time, but can record it

[David G. <dav...@gm...>]

Hi all,

I could not find an answer to this question, although I'm probably not
the only one wanting to use S/PDIF-in on Linux on the Realtek ALC889A,
Gigabyte MA69GM-S2H onboard sound. (Actually, I'm facing a similar
problem in Windows XP.)

I'm using snd-hda-intel, model "6stack-dig".
It seems I can only record from my S/PDIF input. But no matter what I
try, I just cannot hear the sound from my S/PDIF-In on my analog
speaker set. In other words, I can record 10 seconds using:
arecord -D iec958 -c2  -c 2 -d 10 -t wav -f cd test10s.wav

But there's no way that I can hear it real-time trough the controls
alsa(mixer) gives me. The only way I get some idea of what I'm
recording is to feed the arecord output into aplay, which gives me
sound with a 1 second delay (which of course is not an acceptable
workaround). It seems there is just no existing route from IEC958-In
to the analog outputs...

Am I the only one having this problem?! Is there a trick that I can
pull in my .asoundrc?

Thanks in advance,
David

FWIW, here's my aadebug output:
----------------------
ALSA Audio Debug v0.1.0 - wo mei  7 12:13:43 CEST 2008
http://alsa.opensrc.org/aadebug
http://www.gnu.org/licenses/gpl.txt

Kernel ----------------------------------------------------
Linux windsor 2.6.22-14-generic #1 SMP Tue Feb 12 07:42:25 UTC 2008
i686 GNU/Linux

Loaded Modules --------------------------------------------
snd_hda_intel         263712  11
snd_pcm_oss            44672  0
snd_mixer_oss          17664  1 snd_pcm_oss
snd_pcm                80388  5 snd_hda_intel,snd_pcm_oss
snd_seq_dummy           4740  0
snd_seq_oss            33152  0
snd_seq_midi            9600  0
snd_rawmidi            25728  1 snd_seq_midi
snd_seq_midi_event      8448  2 snd_seq_oss,snd_seq_midi
snd_seq                53232  6
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event
snd_timer              24324  5 snd_pcm,snd_seq
snd_seq_device          9228  5
snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq
snd                    54660  25
snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
snd_page_alloc         11400  2 snd_hda_intel,snd_pcm

Modprobe Conf ---------------------------------------------
Warning: module config file does not exist
This means any kernel modules will not be auto loaded
See your linux distro docs on how to create this file

Proc Asound -----------------------------------------------
Advanced Linux Sound Architecture Driver Version 1.0.14 (Thu May 31
09:03:25 2007 UTC).
 0 [SB             ]: HDA-Intel - HDA ATI SB
                     HDA ATI SB at 0xfe024000 irq 16
 2:        : timer
 3:        : sequencer
 4: [ 0- 2]: digital audio capture
 5: [ 0- 1]: digital audio playback
 6: [ 0- 1]: digital audio capture
 7: [ 0- 0]: digital audio playback
 8: [ 0- 0]: digital audio capture
 9: [ 0]   : control
00-02: ALC882 Analog : ALC882 Analog : capture 2
00-01: ALC882 Digital : ALC882 Digital : playback 1 : capture 1
00-00: ALC882 Analog : ALC882 Analog : playback 1 : capture 2
Client info
 cur  clients : 3
 peak clients : 3
 max  clients : 192

Client   0 : "System" [Kernel]
 Port   0 : "Timer" (Rwe-)
 Port   1 : "Announce" (R-e-)
   Connecting To: 15:0
Client  14 : "Midi Through" [Kernel]
 Port   0 : "Midi Through Port-0" (RWe-)
Client  15 : "OSS sequencer" [Kernel]
 Port   0 : "Receiver" (-we-)
   Connected From: 0:1

Dev Snd ---------------------------------------------------
controlC0  pcmC0D0c  pcmC0D0p  pcmC0D1c  pcmC0D1p  pcmC0D2c  seq  timer

CPU -------------------------------------------------------
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
cpu MHz         : 1000.000
model name      : AMD Athlon(tm) 64 X2 Dual Core Processor 5200+
cpu MHz         : 1000.000

RAM -------------------------------------------------------
MemTotal:      2074856 kB
SwapTotal:     3903784 kB

Hardware --------------------------------------------------
00:00.0 Host bridge: ATI Technologies Inc RS690 Host Bridge
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] HyperTransport Technology Configuration
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] Address Map
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] DRAM Controller
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8
[Athlon64/Opteron] Miscellaneous Control