[ALSA - driver 0000653]: poor microphone recording quality on pcicmi

[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=653> 
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Reported By:                pbienst
Assigned To:                tiwai
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Project:                    ALSA - driver
Issue ID:                   653
Category:                   PCI - cmipci
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     assigned
Distribution:               Gentoo
Kernel Version:             2.6.9-gentoo-r4
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Date Submitted:             11-18-2004 10:58 CET
Last Modified:              11-18-2004 19:26 CET
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Summary:                    poor microphone recording quality on pcicmi
Description: 
I have a C-Media PCI CMI8738-MC6 (rev 16) from a Hercules Muse DVD soundd
card.

When recording from a headset microphone, sound quality is really bad: low

volume and quite some noise / distortion.

I have my microphone mixers maxed out, 'Mic boost' is on, 'Mic as
Center/LFE' 
is off.

I've fiddled with all the other options, but they don't seem to affect the

quality.

I do my recording with:

arecord -D hw:1,0 -d 4 test.wav

Under Windows, sound quality is a lot better with the same setup.
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----------------------------------------------------------------------
 pbienst - 11-18-04 19:11 
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I applied the patch, but I'm not able to change these settings. With
alsamixer, they don't budge, and with amixer I get:

pbienst@pbienst:~: amixer -c 1 set MICBST unmute
Simple mixer control 'MICBST',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]

But immediately afterwards:

pbienst@pbienst:~: amixer -c 1 get MICBST
Simple mixer control 'MICBST',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]

----------------------------------------------------------------------
 pbienst - 11-18-04 19:26 
----------------------------------------------------------------------
In the absense of any user controls, I tried changing the options by
changing e.g.

CMIPCI_MIXER_SW_MONO("MICBST", CM_REG_EXTENT_IND, 2, 0),

to

CMIPCI_MIXER_SW_MONO("MICBST", CM_REG_EXTENT_IND, 2, 1),

In the module.

Unfortunately, none of these options seems to make any difference.

Trouble is course that there are so many different options, and if they
interact, it's like a combinatorial explosion.

Are there any mixer settings which could be important, and others which
are definitely unimportant for this problem?

Issue History
Date Modified  Username       Field                    Change              
======================================================================
11-18-04 10:58 pbienst        New Issue                                    
11-18-04 10:58 pbienst        Distribution              => Gentoo          
11-18-04 10:58 pbienst        Kernel Version            => 2.6.9-gentoo-r4 
11-18-04 18:07 tiwai          Note Added: 0002453                          
11-18-04 18:08 tiwai          File Added: cmipci-test.diff                    
11-18-04 19:11 pbienst        Note Added: 0002459                          
11-18-04 19:26 pbienst        Note Added: 0002460                          
======================================================================




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