[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
======================================================================
Date Submitted:             04-29-2005 15:33 CEST
Last Modified:              06-21-2005 00:50 CEST
======================================================================
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?
======================================================================
Relationships       ID      Summary
----------------------------------------------------------------------
has duplicate       0001094 nforce4 - optical spdif out not working
======================================================================

----------------------------------------------------------------------
 gilesjuk - 06-19-05 16:07 
----------------------------------------------------------------------
I was playing AVI files with mplayer and suddenly I got sound. Mplayer is
set to use SDL on my system. So there must be a certain combination of
factors that work.

The audio in the AVI was mp3, Mplayer says this:

-------
AF_pre: af format: 2 bps, 2 ch, 48000 hz, little endian signed int
AF_pre: 48000Hz 2ch Signed 16-bit (Little-Endian)
[AO SDL] Samplerate: 48000Hz Channels: Stereo Format Signed 16-bit
(Little-Endian)
-------

So maybe 48Khz works?

----------------------------------------------------------------------
 gilesjuk - 06-21-05 00:50 
----------------------------------------------------------------------
Gotta fix this bug, analog out on my card seriously sucks the DAC in my
Marantz is much nicer.

Anyway, my card apparently has a Realtek ALC650, there's specs here
including registers. My board has Nforce 5 but the codec is on a seperate
card (Fatal1ty board).

ftp://152.104.125.9/pc/ac97/alc650/alc650_data5.zip

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                          
06-08-05 15:01 tiwai          Note Added: 0004928                          
06-10-05 18:07 Human          Note Added: 0004984                          
06-19-05 16:07 gilesjuk       Note Added: 0005090                          
06-21-05 00:50 gilesjuk       Note Added: 0005099                          
======================================================================




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