[ALSA - utils 0000429]: Feature: Ability to cap the volume

[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=429> 
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Reported By:                morgoth
Assigned To:                
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Project:                    ALSA - utils
Issue ID:                   429
Category:                   alsamixer
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     new
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Date Submitted:             08-07-2004 23:39 CEST
Last Modified:              01-02-2006 20:01 CET
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Summary:                    Feature: Ability to cap the volume
Description: 
For my soundcard (SB Live! 1024) I can't have the PCM higher then 74%
before I get some werd noises. If there was a way to cap or lock the
volume so that _no_ programs (like xmms or mplayer) could turn it higher.
That would be great :)
I don't know why all programs try to adjust the PCM instead of Master or
any of the others. But a cap would be a start ;)
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 afran - 01-02-06 19:36 
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Yes, this still seems to be a problem, at least on my card (Creative Labs
SB Live! EMU10k1, rev 08). I've tested it with ALSA driver version
1.0.11rc1 (I hope that's the latest release, you have mentioned), and
still get distorted noises when PCM is set to more than 74%.

I recorded the output of my Creative card with my Terratec Phase 26 (all
mixers except Master and PCM left on their default settings) and uploaded
the results [1]. You should notice the noise in every file with PCM set to
100% (Master doesn't seem to have any influence on the noise, just makes
output louder):

- sb.074.074.wav: SB Live! playing at Master 74%, PCM 74%.
- sb.074.100.wav: SB Live! playing at Master 74%, PCM 100%.
- sb.100.074.wav: SB Live! playing at Master 100%, PCM 74%.
- sb.100.100.wav: SB Live! playing at Master 100%, PCM 100%.

And just for reference the same original file played with my Phase 26 and
recorded with the very same card (that card has only one mixer control, so
no volume for Master is given):

- phase.086.wav: Phase 26 playing at PCM 86% (default).
- phase.100.wav: Phase 26 playing at PCM 100%.

[1] http://tmp.afran.de/alsa/

--
PS: Please, could someone with more privileges upload the files posted
above onto this Mantis bug tracker or some other more stable server? I
don't want to leave those files on my server (limited bandwidth) forever,
so I probably have to remove them some day without further warning.

----------------------------------------------------------------------
 pzad - 01-02-06 20:01 
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Audigy 2 ZS has diffrent mixer and signal routing.

On sb live
PCM on 75 % should be 0 db
PCM on 100 % is +12 db

Issue History
Date Modified  Username       Field                    Change              
======================================================================
08-07-04 23:39 morgoth        New Issue                                    
08-08-04 19:41 afran          Issue Monitored: afran                       
08-08-04 19:52 afran          Note Added: 0001545                          
12-31-05 07:26 rlrevell       Note Added: 0007350                          
01-02-06 19:36 afran          Note Added: 0007377                          
01-02-06 20:01 pzad           Note Added: 0007378                          
======================================================================




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