ALSA or OSS?

I'm having the same problem since I upgraded to Gnome 2.4. I'm using
ALSA. With my card, the volume channels are a bit buggy (surround
channel controls master volume, while master channel is redundant). So
I have to control volume using the PCM channel, but now acme is stuck
to changing master volume only, even if the 'use PCM' box is checked.

I'm using ALSA on a to 2.6 kernel.

G'day =)

Here's a patch to fix the problem (hopefully!)




--- src/acme-volume-alsa.c	2003-07-01 10:04:03.000000000 +1000
+++ ../acme-volume-alsa.c	2003-12-18 12:04:20.000000000 +1100
@@ -77,8 +77,25 @@
 static void
 acme_volume_alsa_set_use_pcm (AcmeVolume *vol, gboolean val)
 {
-	AcmeVolumeAlsa *self = (AcmeVolumeAlsa *) vol;
-	self->_priv->use_pcm = val;
+   snd_mixer_selem_id_t *sid = NULL;
+   snd_mixer_elem_t *elem;
+                                                                    
                                     
+   AcmeVolumeAlsa *self = (AcmeVolumeAlsa *) vol;
+   self->_priv->use_pcm = val;
+                                                                    
                                     
+   snd_mixer_selem_id_alloca(&sid);
+   snd_mixer_selem_id_set_name (sid, (val?"PCM":"Master"));
+                                                                    
                                     
+   elem = snd_mixer_find_selem(self->_priv->handle, sid);
+                                                                    
                                     
+   if (!elem)
+   {
+      D("snd_mixer_find_selem");
+   }
+   else
+   {
+      self->_priv->elem = elem;
+   }
 }
 
 static gboolean


Mike Tyson
mike at tzidesign.com

*** Bug 122908 has been marked as a duplicate of this bug. ***

2003-12-18  Bastien Nocera  <hadess@hadess.net>
                                                                     
          
        * src/acme-volume-alsa.c: (acme_volume_alsa_set_use_pcm):
        Fix PCM usage with ALSA, patch by Mike Tyson
        <mike at tzidesign.com> (Closes: #125538)

*** Bug 129996 has been marked as a duplicate of this bug. ***

I compiled the CVS version of acme as a debian package, using the
debian folder from the debian maintainer, and the problem appears to
still be here.
The option "Use PCM ..." doesn't appear in the properties window
anymore, but is still checked in gconf. When the volume and mute
buttons are pressed, no change is made to the PCM volume, and only
master volume is modified.
I'd be please to help if you could give me any tip...

In the current CVS version of acme, the PCM option has been removed,
and is not used anymore:

2004-01-02  Bastien Nocera  <hadess@hadess.net>
                                                                     
         
        * src/acme-properties.c: (init_gui):
        * src/acme-properties.glade:
        * src/acme-volume-alsa.c: (acme_volume_alsa_class_init):
        * src/acme-volume-dummy.c: (acme_volume_dummy_class_init):
        * src/acme-volume-oss.c: (acme_volume_oss_class_init):
        * src/acme-volume.c:
        * src/acme-volume.h:
        * src/acme.c: (main):
        * src/acme.schemas.in: remove the "Use PCM" option as we can
        auto-detect whether there is a Master volume or not.