[mythtv-users] ALSA experts: Please help me configure SPDIF

JDP DATA jdpdata at gmail.com
Mon Jun 18 21:21:18 UTC 2007


I've been try to get SPDIF output on my frontend with no success.  Please
any kind souls out there help me.
I already try
http://mythtv.org/wiki/index.php/Configuring_Digital_Sound_with_AC3_and_SPDIFand
http://www.alsa-project.org/alsa-doc/doc-php/template.php?module=intel8x0#opt


Well to be more specific, I do get sound via tos-link but only 2 channel
(Dolby Pro-logic).  I want to passthrough 5.1 (Dolby Digital).  Not having
any luck, I've try playing with alsamixer.  Unmute iec958 and set slider to
"0", still no AC3 output to my receiver.

my specs:
Mythdora 4.0
Shuttle XPC SB75G2 optical output ==>> Denon AVR-95 optical input
Intel Corporation 82801EB/ER (ICH5/ICH5R) AC'97 Audio Controller (rev 02)
Alsa v1.0.14


lspci
00:00.0 Host bridge: Intel Corporation 82875P/E7210 Memory Controller Hub
(rev 02)
00:01.0 PCI bridge: Intel Corporation 82875P Processor to AGP Controller
(rev 02)
00:06.0 System peripheral: Intel Corporation 82875P/E7210 Processor to I/O
Memory Interface (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI
Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI
Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI
Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI
Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2 EHCI
Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev c2)
00:1f.0 ISA bridge: Intel Corporation 82801EB/ER (ICH5/ICH5R) LPC Interface
Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801EB/ER (ICH5/ICH5R) IDE
Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801EB (ICH5) SATA Controller (rev
02)
00:1f.3 SMBus: Intel Corporation 82801EB/ER (ICH5/ICH5R) SMBus Controller
(rev 02)
00:1f.5 Multimedia audio controller: Intel Corporation 82801EB/ER
(ICH5/ICH5R) AC'97 Audio Controller (rev 02)
01:00.0 VGA compatible controller: nVidia Corporation NV34GL [Quadro FX
500/600 PCI] (rev a1)
02:06.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host
Controller (rev 46)
02:07.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5788 Gigabit
Ethernet (rev 03)

aplay -L
front:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    Front speakers
surround40:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    4.0 Surround output to Front and Rear speakers
surround41:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=ICH5,DEV=0
    Intel ICH5, Intel ICH5
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
null
    Discard all samples (playback) or generate zero samples (capture)

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ICH5 [Intel ICH5], device 0: Intel ICH [Intel ICH5]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: ICH5 [Intel ICH5], device 4: Intel ICH - IEC958 [Intel ICH5 -
IEC958]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

modprobe.conf
alias scsi_hostadapter ata_piix
alias snd-card-0 snd-intel8x0
options snd-card-0 index=0
options snd-intel8x0 index=0
remove snd-intel8x0 { /usr/sbin/alsactl store 0 >/dev/null 2>&1 || : ; };
/sbin/modprobe -r --ignore-remove snd-intel8x0
# nvidia kernel module
alias char-major-195 nvidia-1_0-9755
alias nvidia nvidia-1_0-9755
alias eth0 tg3

asound.conf
#Generated by system-config-soundcard, do not edit by hand
#SWCONF
#DEV 4
defaults.pcm.card 0
defaults.pcm.device 4
defaults.ctl.card 0
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