After talked with Huiwang, we updated the patch.
When the input device list is null ,we reset the original value for
label.
Index: gnome-control-center-3.4.2/panels/sound-nua/gvc-mixer-dialog.c
--- gnome-control-center-3.4.2.orig/panels/sound-nua/gvc-mixer-dialog.c
2014-03-13 16:16:03.291570375 +0800
+++ gnome-control-center-3.4.2/panels/sound-nua/gvc-mixer-dialog.c
2014-03-13 18:29:23.125618264 +0800
@@ -721,6 +721,10 @@
model = gtk_tree_view_get_model (GTK_TREE_VIEW
(dialog->priv->input_treeview));
if (gtk_tree_model_get_iter_first (model, &iter) == FALSE){
+ /* When there are no device we need disable the input bar and
set the original name */
+ gtk_label_set_label
(GTK_LABEL(dialog->priv->selected_input_label),
+ _("Settings for the selected device"));
+ gtk_widget_set_sensitive (dialog->priv->input_bar, FALSE);
g_warning ("The tree is empty => we have no devices so cannot
set the active input");
return;
}
@@ -1382,6 +1386,8 @@
return;
}
add_input_ui_entry (dialog, in);
+ /* update input bar when new input device added */
+ active_input_update (dialog, in);
}
static void
@@ -1446,6 +1452,8 @@
if (found) {
gtk_list_store_remove (GTK_LIST_STORE (model), &iter);
}
+ /* update input bar when input device removed */
+ active_input_update (dialog, in);
}
static void
** Patch added: "the new version of the patch."
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1291862/+attachment/4021865/+files/debug.patch
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https://bugs.launchpad.net/bugs/1291862
Title:
[soundnua]mic volume adjust bar is gray if you open sound-nua input
tab earlier than plugging micphone
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