[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.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1726> 
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Reported By:                Raymond
Assigned To:                mjander
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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
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Date Submitted:             01-08-2006 17:41 CET
Last Modified:              02-10-2006 10:50 CET
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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

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----------------------------------------------------------------------
 Raymond - 02-10-06 06:32 
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Since only the front channels are routed through the equalizer, you may use
the graphic equalizer in the vortex control panel to monitor the peak

http://alsa.opensrc.org/au88x0

----------------------------------------------------------------------
 ponchick - 02-10-06 10:50 
----------------------------------------------------------------------
I see very little diffrece between peaks. First time front left/right
sounds a little louder (peaks are little higher) then on second run. Rear
channels always sounds almost equally on any run (peaks are same). 
At home I have another au8830 on 32-bit UP (no hyperthreading) pentium4
but it little outdated. Today I get up-to-date kernel, alsa-* and this
patch and try to play with it a little.

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




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