Index: plugins/media-keys/gsd-media-keys-manager.c
===================================================================
--- plugins/media-keys/gsd-media-keys-manager.c.orig
+++ plugins/media-keys/gsd-media-keys-manager.c
@@ -637,6 +637,7 @@ do_sound_action (GsdMediaKeysManager *ma
                  gboolean             quiet)
 {
         gboolean old_muted, new_muted;
+        gboolean toggle_mute;
         guint old_vol, new_vol, max_vol, norm_vol_step;
         gboolean sound_changed;
 
@@ -653,7 +654,11 @@ do_sound_action (GsdMediaKeysManager *ma
 
         switch (type) {
         case MUTE_KEY:
-                new_muted = !old_muted;
+                toggle_mute = g_settings_get_boolean (manager->priv->settings, "toggle-mute");
+                if (toggle_mute)
+                        new_muted = !old_muted;
+                else
+                        new_muted = TRUE;
                 break;
         case VOLUME_DOWN_KEY:
                 if (old_vol <= norm_vol_step) {
Index: data/gnome-settings-daemon.convert
===================================================================
--- data/gnome-settings-daemon.convert.orig
+++ data/gnome-settings-daemon.convert
@@ -66,6 +66,7 @@ volume-down = /apps/gnome_settings_daemo
 volume-mute = /apps/gnome_settings_daemon/keybindings/volume_mute
 volume-up = /apps/gnome_settings_daemon/keybindings/volume_up
 www = /apps/gnome_settings_daemon/keybindings/www
+toggle-mute = /apps/gnome_settings_daemon/toggle_mute
 
 [org.gnome.settings-daemon.plugins.mouse]
 active = /apps/gnome_settings_daemon/plugins/mouse/active
Index: data/org.gnome.settings-daemon.plugins.media-keys.gschema.xml.in.in
===================================================================
--- data/org.gnome.settings-daemon.plugins.media-keys.gschema.xml.in.in.orig
+++ data/org.gnome.settings-daemon.plugins.media-keys.gschema.xml.in.in
@@ -145,5 +145,10 @@
       <_summary>Magnifier zoom out</_summary>
       <_description>Binding for the magnifier to zoom out</_description>
     </key>
+    <key name="toggle-mute" type="b">
+      <default>true</default>
+      <_summary>Toggle Mute</_summary>
+      <_description>Toggle the sound mixer's mute status when then mute button is pressed.</_description>
+    </key>
   </schema>
 </schemalist>