Strange iec958/spdif behavior

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Hello,

my computer is conected with the iec958 interface to my AV-Receiver. Unfortunately i have not sound on my AV-Reicerver when i play a MP3 on my computer. But if i play an file with AC3 or DTS audio i can hear the sound. I tested this with VLC, with the options "interface alsa" and "use spdif" . On my computer runs Debian Testing.

I also tried this with a Puppy Linux installatoion on the same computer. On the Puppy Linux all work fine.

I also use the program aplay for tests with the following results.

This commnad works, i hear the sound:

$ aplay -D iec958:CARD=SB,DEV=0 /usr/share/sounds/ekiga/ring.wav

This command works not, no sound.

$ aplay -D plughw:0,1 /usr/share/sounds/ekiga/ring.wav

The alsa hareware adresse should be correct.

$ root@foobar:~# aplay -l
**** Liste der Hardware-GerÃte (PLAYBACK) ****
Karte 0: SB [HDA ATI SB], GerÃt 0: VT1708S Analog [VT1708S Analog]
Sub-GerÃte: 2/2
Sub-GerÃt #0: subdevice #0
Sub-GerÃt #1: subdevice #1
Karte 0: SB [HDA ATI SB], GerÃt 1: VT1708S Digital [VT1708S Digital]
Sub-GerÃte: 1/1
Sub-GerÃt #0: subdevice #0

Â

On the Puppy Linux both commands work. It seems on my Debian installation ist something worng. But i can't found it. Any help?

Â

Here some more information.

$ root@foobar:~# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
front:CARD=SB,DEV=0
HDA ATI SB, VT1708S Analog
Front speakers
surround40:CARD=SB,DEV=0
HDA ATI SB, VT1708S Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=SB,DEV=0
HDA ATI SB, VT1708S Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=SB,DEV=0
HDA ATI SB, VT1708S Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=SB,DEV=0
HDA ATI SB, VT1708S Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=SB,DEV=0
HDA ATI SB, VT1708S Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=SB,DEV=0
HDA ATI SB, VT1708S Digital
IEC958 (S/PDIF) Digital Audio Output

Â

$ root@foobar:~# amixer
Simple mixer control 'Master Front',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 31 [100%] [12.00dB] [on]
Front Right: Playback 31 [100%] [12.00dB] [on]
Simple mixer control 'PCM',0
Capabilities: pvolume penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB]
Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Front',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 42
Mono:
Front Left: Playback 42 [100%] [0.00dB] [on]
Front Right: Playback 42 [100%] [0.00dB] [on]
Simple mixer control 'Front Mic Boost',0
Capabilities: cvolume penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 3
Front Left: Capture 0 [0%] [0.00dB]
Front Right: Capture 0 [0%] [0.00dB]
Simple mixer control 'Surround',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 42
Mono:
Front Left: Playback 42 [100%] [0.00dB] [on]
Front Right: Playback 42 [100%] [0.00dB] [on]
Simple mixer control 'Center',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 42
Mono: Playback 42 [100%] [0.00dB] [on]
Simple mixer control 'LFE',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 42
Mono: Playback 42 [100%] [0.00dB] [on]
Simple mixer control 'Side',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 42
Mono:
Front Left: Playback 42 [100%] [0.00dB] [on]
Front Right: Playback 42 [100%] [0.00dB] [on]
Simple mixer control 'Line',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [off]
Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'CD',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 23 [74%] [0.00dB] [on]
Front Right: Playback 23 [74%] [0.00dB] [on]
Simple mixer control 'Mic',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [off]
Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'Mic Boost',0
Capabilities: cvolume penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 3
Front Left: Capture 3 [100%] [30.75dB]
Front Right: Capture 3 [100%] [30.75dB]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'IEC958 Default PCM',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 19 [61%] [12.00dB] [on]
Front Right: Capture 19 [61%] [12.00dB] [on]
Simple mixer control 'Capture',1
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 0 [0%] [-16.50dB] [on]
Front Right: Capture 0 [0%] [-16.50dB] [on]
Simple mixer control 'Input Source',0
Capabilities: cenum
Items: 'Stereo Mixer' 'Mic' 'Line' 'CD'
Item0: 'Stereo Mixer'
Simple mixer control 'Smart 5.1',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [off]

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