[ALSA - driver 0001083]: NVIDIA CK8 ALC655 SPDIF passthrough

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1083> 
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Reported By:                vedran
Assigned To:                
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Project:                    ALSA - driver
Issue ID:                   1083
Category:                   PCI - intel8x0
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
Distribution:               Debian sid
Kernel Version:             2.6.10-ac12
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Date Submitted:             04-29-2005 15:33 CEST
Last Modified:              06-06-2005 23:30 CEST
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Summary:                    NVIDIA CK8 ALC655 SPDIF passthrough
Description: 
We're using a motherboard with nVidia nforce2IGP chipset, and the sound
device on this board is NVidia CK8, Realtek ALC655 rev 0. The motherboard
is MSI K7N2GM2, and SPDIF passthrough works fine on Windows XP with stock
realtek drivers.

On Linux, I'm using the latest ALSA CVS (29.04.2005.) on a 2.6.10-ac12
kernel.

I've been able to make a 2 channel  pre-decoded SPDIF output work by using
the hw:0,2 device. If I use the default device, there is no sound on
SPDIF, regardless of the SPDIF related controls in mixer. The controls in
the mixer are:

However, I'm having trouble with AC3 passthrough, I'm using ac3dec -C from
alsa-tools CVS, and I get no sound.

I'm attaching the archive with the output of iecset and
/proc/asound/card0/codec97#0/* files during the ac3dec run, and when
idle.

Maybe the fact that decoded SPDIF output is not working until I pass it
through the hw:0,2 has something to do with this, how can I make ac3dec -C
use hw:0,2?
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Relationships       ID      Summary
----------------------------------------------------------------------
has duplicate       0001094 nforce4 - optical spdif out not working
======================================================================

----------------------------------------------------------------------
 Human - 06-03-05 00:31 
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Bug 1094, which discusses the nForce4 (CK804 chipset with ALC850) was
marked as a dupe of this one, so I'll post here regarding the nForce4.

What information/equipment is required to get the nForce4 S/PDIF working
in ALSA?  Does the right ALSA developer have an nForce4 motherboard?  If
not, maybe one of us can lend a spare board.  If there's anything any of
us nForce4 users can do to help get support in ALSA, please let us know.

I've tried the latest stable ALSA (1.0.9/1.0.9a as of this writing) and
can only get analog sound working on my MSI K8N Neo4 Platinum.  I've also
tried it on a Gigabyte GA-K8NF-9 board with the same results.

----------------------------------------------------------------------
 Human - 06-06-05 23:30 
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I wanted to add that SPDIF works on nForce4 using ALSA 1.0.6.  Apparently,
there has been a regression on nForce4 between 1.0.6 and 1.0.9/1.0.9a. 
Here are the steps I took to verify that it worked.  You may just need to
install ALSA 1.0.6 to test it, but here's everything I did.

1) Install KnoppMyth R5A12 (which includes ALSA 1.0.6).
2) connect your nForce4 motherboard's coaxial S/PDIF output to your
receiver's coaxial digital audio in connector
3) run xine and configure audio for Pass Through
4) using xine, play a ripped DVD with an AC3 soundtrack

This works with the Gigabyte GA-K8NF-9 and the MSI K8N Neo4 Platinum. 
What other information can I provide in order to get nForce4 working again
in ALSA?

Issue History
Date Modified  Username       Field                    Change              
======================================================================
04-29-05 15:33 vedran         New Issue                                    
04-29-05 15:33 vedran         File Added: spdif_passthrough.tar.gz              
     
04-29-05 15:33 vedran         Distribution              => Debian sid      
04-29-05 15:33 vedran         Kernel Version            => 2.6.10-ac12     
05-30-05 13:21 vedran         Note Added: 0004809                          
06-01-05 16:53 tiwai          Note Added: 0004862                          
06-01-05 16:54 tiwai          Relationship added       has duplicate 0001094
06-01-05 19:19 eklarson       Issue Monitored: eklarson                    
06-03-05 00:31 Human          Note Added: 0004880                          
06-03-05 00:32 Human          Issue Monitored: Human                       
06-06-05 23:30 Human          Note Added: 0004910                          
======================================================================




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