Digital audio problem

Hello!
I Have weird problem with digital audio output in my MB (alu but not pro).
Always i have connect mu MB to the ampli through optical cable (spdif).
At about two weeks I have problem witch i try to explain (sorry for my bad english):
First, internal speakers system and headphone ar not touched with this!
When i start computer with connected optical cable to output port, or connect in in this moment, all looks to be fine, iTunes play audio, other software, included system sounds are played.
When i try to play something in Dolby Digital or other multichannel sound, all work fine, souds are played.
After that, when I try to play something like iTunes, system sounds or fe. mp3 in VLC, I hear nothing, software looks like they play audio, but nothing go to amplituner.
Only restart of my MB helps, to next try of digital (multichannel) audio.
I connect start of this problem with installing Final Cut Pro X (I have uninstall it) but maybe its only accidentally.
My OS is 10.6.8 on mac model 5.1.
Please for any sollution.
Rebards

Hello again.
In thread added above i have found sollution.
Case is connected with system update from 10.6.7 to 10.6.8.
Solution is replace new AppleHDA.kext with this from 10.6.7 (or 10.6.6) version 1.9.9f12
In my case this help and now digital audio works fine.

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I assume you are using the right cable;
Check this:
+No digital audio out on my Headphone - S/P-DIF jack+
http://aps2.toshiba-tro.de/kb0/TSD57013M000UR01.htm
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Moderator note; comment removed which contravened forum rules

I recently (Jan 2012) acquired a MacBook Pro (MBP) running 10.7.4 and an AirPort Express. I also have an old PPC G4 tower (Digital Audio model) running 10.4.11. The OS software on both machines is totally up to date. AirPort Utility on the G4 is 5.4.2

I recently (Jan 2012) acquired a MacBook Pro (MBP) running 10.7.4 and an AirPort Express. I also have an old PPC G4 tower (Digital Audio model) running 10.4.11. The OS software on both machines is totally up to date. AirPort Utility on the G4 is 5.4.2 and on 6.0 on the MBP. I bought a used AirPort card for the G4, I believe it is 802.11b compatible, and the wireless data rate is specified at 11 Mbps. Being a newbie to wireless, it took me many days to get these two machines to link up. This network is not connected to the internet, and there no other networks in the vicinity.
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CEU2

BDAqua,
Thanks for the response.
Apple has used the term "Digital Audio" to identify this machine. System Profiler has the following information:
Machine Name:          Power Mac G4
Machine Model:          PowerMac3,5
CPU Type:          PowerPC G4 (2.1)
Number Of CPUs:          1
CPU Speed:          800 MHz
L2 Cache (per CPU):          256 KB
Memory:          768 MB
Bus Speed:          133 MHz
Boot ROM Version:          4.3.3f2
Serial Number:          XBxxxxxMK9
Sales Order Number:
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<Edited By Host>

[Solved] Difficulty getting digital audio to play in all applications

This is probably a noobish question...
My motherboard supports digital audio out via S/PDIF cable (optical), as well as standard analog audio. I have a stereo receiver that I've plugged my optical cable into.
When I go to systemsettings > Multimedia > Phonon > Audio Playback, I put the "HDA Intel S/PDIF Digital" device on top and clicked Test. I could hear the test tone (playback source is PCM).
However, if I go to play an MP3 or whatever, I have to go into the settings for each application and tell it to use that particular device. Some applications (such as Firefox) do not have obvious settings for audio playback. Is there a way to solve the problem once and for all (tell the audio system "send everything through the digital device all the time")?
(I read the relevant section of the wiki, but it is focused on getting sound out of your digital device, not making it the default.)
Any other advice or gotchas about using digital audio would also be appreciated.
Thanks!
Last edited by nathanb (2012-01-25 20:58:42)

Bah, I did a system update and rebooted and now digital out doesn't work at all!
[nathanb@nathanb-box ~] aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
front:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
Front speakers
surround40:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
4.0 Surround output to Front and Rear speakers
surround41:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=Intel,DEV=0
HDA Intel, AD198x Analog
7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
iec958:CARD=Intel,DEV=0
HDA Intel, AD198x Digital
IEC958 (S/PDIF) Digital Audio Output
Devices don't seem to have changed...
[root@nathanb-box nathanb]# amixer | grep IEC -A 8
Simple mixer control 'IEC958',0
Capabilities: pvolume cvolume pswitch pswitch-joined cswitch cswitch-joined penum
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: Playback 0 - 39 Capture 0 - 31
Front Left: Playback 39 [100%] [0.00dB] [on] Capture 31 [100%] [12.00dB] [on]
Front Right: Playback 39 [100%] [0.00dB] [on] Capture 31 [100%] [12.00dB] [on]
Simple mixer control 'IEC958 Default PCM',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'IEC958 Playback Source',0
Capabilities: enum
Items: 'PCM' 'ADC1' 'ADC2' 'ADC3'
Item0: 'PCM'
Channels still seem to be there...
My .asoundrc looks the same as above. But just for fun, I also tried removing it and restarting alsa, with no change.
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Hi-
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