[ALSA - driver 0001015]: Static when not playing through the OSS Emulation

[bugtrack@alsa-project.org]

The following issue has been RESOLVED.
======================================================================
<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1015> 
======================================================================
Reported By:                wintermute77
Assigned To:                rlrevell
======================================================================
Project:                    ALSA - driver
Issue ID:                   1015
Category:                   PCI - ice1724
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     resolved
Distribution:               Gentoo
Kernel Version:              2.6.10-ck5
Resolution:                 fixed
Fixed in Version:           
======================================================================
Date Submitted:             03-25-2005 04:00 CET
Last Modified:              12-30-2005 05:20 CET
======================================================================
Summary:                    Static when not playing through the OSS Emulation
Description: 
I get crackling static coming in when sound is being output to my speakers
(not when there is nothing playing) using the ice1724 driver with my
M-Audio Revolution 7.2.  The problem appears to go away if I use OSS
emulation, but of course this isn't desirable since I cannot use dmix in
this case.

I am using xmms and mplayer to produce the badness.
======================================================================

----------------------------------------------------------------------
 wintermute77 - 03-26-05 00:50 
----------------------------------------------------------------------
I appear to have resolved my problem.  

I upgraded to 2.6.11-ck2 (which I think had a newer alsa in the kernel)
and used the following dmix configuration, and it worked flawlessly (so
far):

/etc/asound.conf

pcm.ossmix {
    type dmix
    ipc_key 1024
    slave {
        pcm "hw:0,0"
        period_time 0
        period_size 1024
        buffer_size 4096 # buffer size < 6653, but pow(x, 2)
        rate 44100       # we want to play CDs only
    }
    bindings {
        0 0
        1 1
    }
}
# Everything shall be dmixed, so redefine "default":
pcm.!default {
    type plug
    slave.pcm "ossmix"
}
# OSS via aoss should d(mix)stroyed:
pcm.dsp0 {    type plug
    slave.pcm "ossmix"
}
ctl.mixer0 {
    type hw
    card 0
}

----------------------------------------------------------------------
 wintermute77 - 03-26-05 00:52 
----------------------------------------------------------------------
Also, it appears the static comes back if I remove the "rate 44100" line.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
03-25-05 04:00 wintermute77   New Issue                                    
03-25-05 04:00 wintermute77   Distribution              => Gentoo          
03-25-05 04:00 wintermute77   Kernel Version            =>  2.6.10-ck5     
03-25-05 14:57 daspooky       Note Added: 0004207                          
03-25-05 14:58 daspooky       Note Edited: 0004207                         
03-26-05 00:09 wintermute77   Note Added: 0004214                          
03-26-05 00:50 wintermute77   Note Added: 0004215                          
03-26-05 00:52 wintermute77   Note Added: 0004216                          
12-30-05 05:20 rlrevell       Status                   new => resolved     
12-30-05 05:20 rlrevell       Resolution               open => fixed       
12-30-05 05:20 rlrevell       Assigned To               => rlrevell        
======================================================================




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