Are you able to mute it with alsamixer?

This sounds like a problem with KMilo and KMix.  Are you using Master as the master channel, or something else like headphone or PCM.  KMilo respects this channel for volume control but not for mute for some strange reason which may warrent a bug.

https://bugzilla.novell.com/show_bug.cgi?id=254164 seems to describe the same.

Last call to the bug reporter for providing the required feedback. If there is no feddback until July 17th 2007 this bug report will be closed.

Please post the ouput of "amixer" (or "amixer -c 1" or any other number that corresponds to the affected soundcard).

Please also report if other mixes work (e.g. alsamixer).

Comment 2 indicates a KMilo/Kmix issue. We need some extra information here:

1) Are only the multimedia keys affected?
2a) Is the shortcut for the Master affected? (Menu -> Settings -> Global Shortcuts)
2b) Is the shortcut for normal controls (e.g. PCM) affected? (KMix main menu -> PCM slider -> right click -> Global Shortcuts)
3) Is Kmilo running? (kcontrol -> KDE components -> Services -> Lower list "KDE sevices at start" -> KMilo
   if it is running:
    a) Stop it
    b) Disable it
    c) Logout from KDE
    d) Login again
    e) Try it and report back

Lets close it. It is easier to reopen (should the bug reporter answer), than to keep track of this all the time. Also this whole switch problem is fixed in KDE4.

SVN commit 676707 by esken:

Finalized optimal ALSA support. The last open issue (pswitch cswitch) is
now resolved.

BUGS: 123560
BUGS: 135729
BUGS: 126012
BUGS: 125772



 M  +30 -15    mdwslider.cpp  


--- trunk/KDE/kdemultimedia/kmix/mdwslider.cpp #676706:676707
@@ -234,22 +234,36 @@
 
 
 
-    // --- SLIDERS ---------------------------
-    QBoxLayout *volLayout;
-    if ( _orientation == Qt::Vertical ) {
-        volLayout = new QHBoxLayout( );
-        volLayout->setAlignment(Qt::AlignVCenter);
-    }
-    else {
-        volLayout = new QVBoxLayout(  );
-        volLayout->setAlignment(Qt::AlignHCenter);
-    }
-    sliLayout->addItem( volLayout );
+   // --- SLIDERS ---------------------------
+   QBoxLayout *volLayout;
+   if ( _orientation == Qt::Vertical ) {
+      volLayout = new QHBoxLayout( );
+      volLayout->setAlignment(Qt::AlignVCenter);
+   }
+   else {
+      volLayout = new QVBoxLayout(  );
+      volLayout->setAlignment(Qt::AlignHCenter);
+   }
+   sliLayout->addItem( volLayout );
 
-    if ( m_mixdevice->playbackVolume().count() > 0 )
-       addSliders( volLayout, 'p' );
-    if ( m_mixdevice->captureVolume().count() > 0 )
+   if ( m_mixdevice->playbackVolume().count() > 0 )
+      addSliders( volLayout, 'p' );
+   if ( m_mixdevice->captureVolume().count() > 0 )
        addSliders( volLayout, 'c' );
+   if ( m_mixdevice->playbackVolume().count() == 0 && m_mixdevice->captureVolume().count() == 0 )
+   {  // no siders => put a label with the name.
+      // But I won't add " (capture)" as on the sliders, because there is only one "column"
+      if ( _orientation == Qt::Vertical ) {
+         m_label = new VerticalText( this, m_mixdevice->readableName() );
+      }
+      else {
+         m_label = new QLabel(this);
+         static_cast<QLabel*>(m_label)->setText(m_mixdevice->readableName());
+      }
+      volLayout->addWidget( m_label );
+      m_label->installEventFilter( this );
+      m_label->setToolTip( m_mixdevice->readableName() );  // @todo: Whatsthis, explaining the device
+   }
 
    // --- RECORD SOURCE LED --------------------------
    if ( showRecordLED )
@@ -277,7 +291,8 @@
          reclayout->addWidget( m_recordLED );
          connect(m_recordLED, SIGNAL(stateChanged(bool)), this, SLOT(setRecsrc(bool)));
          m_recordLED->installEventFilter( this );
-         m_recordLED->setToolTip( i18n( "Record" ) );
+         QString muteTip( i18n( "Capture/Uncapture %1", m_mixdevice->readableName() ) );
+         m_recordLED->setToolTip( muteTip );  // @todo: Whatsthis, explaining the device
       } // has Record LED
       else
       {