[ALSA - lib 0001971]: Some elements incorrectly have capture flags

[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=1971> 
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Reported By:                pzad
Assigned To:                
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Project:                    ALSA - lib
Issue ID:                   1971
Category:                   simple mixer
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
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Date Submitted:             03-28-2006 12:16 CEST
Last Modified:              03-30-2006 13:13 CEST
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Summary:                    Some elements incorrectly have capture flags
Description: 
Some elemnts have capture flags even they have nothing to do with capture.
This will duplicate control in alsamixer - view ALL.

On VIA8233A + ALC650:

Simple mixer control '3D Control - Center',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 15
  Mono: 1 [7%]
Simple mixer control '3D Control - Depth',0
  Capabilities: volume volume-joined
  Playback channels: Mono
  Capture channels: Mono
  Limits: 0 - 15
  Mono: 0 [0%]

On Audigy 1:
Simple mixer control 'Bass',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 40
  Front Left: 23 [58%]
  Front Right: 23 [58%]
Simple mixer control 'Treble',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 40
  Front Left: 27 [68%]
  Front Right: 27 [68%]


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----------------------------------------------------------------------
 pzad - 03-30-06 12:50 
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http://cvs.sourceforge.net/viewcvs.py/alsa/alsa-lib/src/mixer/simple_none.c?r1=1.3&r2=1.4

Alsa-lib uses 1 or more kernel control and groups them to 1 mixer element.
Kernel controls have various suffixes ("Playback Volume", "Playback
Switch", "Capture Volume", ...). These suffixes decides if mixer elemnts
have or don't have capture flag. If there is no definition of dirrection
("Playback" or "Capture suffix) alsa-lib assumes global volume (has
playback and capture).

For me, best solution will be to add "Playback Volume" or "Playback
Switch" suffix to kernel controls names. ("Tone Control - Bass" -> "Tone
Control - Bass Playback Volume")

Or all controls without suffix behave like playback only.

----------------------------------------------------------------------
 pzad - 03-30-06 13:13 
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Anyway there is still bug, because this "Captrure" mixer element in
alsamixer doesn't work at all.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
03-28-06 12:16 pzad           New Issue                                    
03-30-06 11:01 Raymond        Note Added: 0009028                          
03-30-06 12:50 pzad           Note Added: 0009031                          
03-30-06 13:13 pzad           Note Added: 0009032                          
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