[ALSA - driver 0001726]: Front and Rear channels swap after first play when playing Surround40 on au8830

[bugtrack@alsa-project.org]

A NOTE has been added to this issue.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1726> 
======================================================================
Reported By:                Raymond
Assigned To:                mjander
======================================================================
Project:                    ALSA - driver
Issue ID:                   1726
Category:                   PCI - au88x0
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Distribution:               Fedora Core 1
Kernel Version:             2.4.22-1.2199.nptl
======================================================================
Date Submitted:             01-08-2006 17:41 CET
Last Modified:              02-10-2006 13:49 CET
======================================================================
Summary:                    Front and Rear channels swap after first play when
playing Surround40 on au8830
Description: 
The front and rear channels are correct for playing Surround40 only at the
first time after the driver is loaded. 

The front and rear channels (Surround40) always swapped afterward using
speaker-test or xine. 

Playing stereo sound is OK.


 speaker-test -c4 -D hw:0,0
 
speaker-test 1.0.11rc2
 
Playback device is hw:0,0
Stream parameters are 48000Hz, S16_LE, 4 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 2 to 8192
Period size range from 1 to 512
Periods = 4
Buffer time size 2525
To choose buffer_size = 8192
To choose period_size = 2048
was set period_size = 512
was set buffer_size = 8192
 0 - Front Left
 1 - Front Right
 3 - Rear Right
 2 - Rear Left
Time per period = 11.856821
 0 - Front Left
 1 - Front Right
 3 - Rear Right
 2 - Rear Left

======================================================================

----------------------------------------------------------------------
 Raymond - 02-10-06 11:25 
----------------------------------------------------------------------
Refer to your photo, your au8830 has only 1 green jack and WM970x stereo
codec. 

http://www.dearhoney.idv.tw/museum/soundcard-07.php

Please try au88x0_pcm_channels.patch which fix the playback channels in
https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1766 

May need to patch the driver to disable SPDIF (device 1) by checking the
PCI subsystem id for your au8830

----------------------------------------------------------------------
 Raymond - 02-10-06 13:49 
----------------------------------------------------------------------
Just use the cvs version without au88x0_surround40.patch to test whether
the swapping of front/rear occur in some or all au8830 chips as your
au8830 chip is B0AAAA.
			
#ifdef CHIP_AU8830
    .channels_max = 4,
#else

speaker-test -t wav -D hw:0,0 -c 4

Do your hear the female voice "front left" and "front right" after the
driver is loaded ?

You will need to quit the speaker-test and run it again.

Do you hear the the female voice "rear left" and "rear right" ?

Issue History
Date Modified  Username       Field                    Change              
======================================================================
01-08-06 17:41 Raymond        New Issue                                    
01-08-06 17:41 Raymond        Distribution              => Fedora Core 1   
01-08-06 17:41 Raymond        Kernel Version            => 2.4.22-1.2199.nptl
01-27-06 16:45 Raymond        File Added: au88x0_surround40.patch               
    
02-04-06 06:26 Raymond        Note Added: 0007912                          
02-10-06 05:36 ponchick       Note Added: 0007987                          
02-10-06 06:32 Raymond        Note Added: 0007991                          
02-10-06 10:50 ponchick       Note Added: 0007998                          
02-10-06 11:25 Raymond        Note Added: 0008000                          
02-10-06 13:49 Raymond        Note Added: 0008003                          
======================================================================




-------------------------------------------------------
This SF.net email is sponsored by: Splunk Inc. Do you grep through log files
for problems?  Stop!  Download the new AJAX search engine that makes
searching your log files as easy as surfing the  web.  DOWNLOAD SPLUNK!
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=103432&bid=230486&dat=121642