diff --git a/sound/ppc/tumbler.c b/sound/ppc/tumbler.c
index 696280c..0b69e96 100644
--- a/sound/ppc/tumbler.c
+++ b/sound/ppc/tumbler.c
@@ -246,6 +246,7 @@
 		snd_printk(KERN_ERR "failed to set volume \n");
 		return -EINVAL;
 	}
+	DBG("(I) succeeded to set volume (%u, %u)\n", left_vol, right_vol);
 	return 0;
 }
 
@@ -356,6 +357,7 @@
 		snd_printk(KERN_ERR "failed to set DRC\n");
 		return -EINVAL;
 	}
+	DBG("(I) succeeded to set DRC (%u, %u)\n", val[0], val[1]);
 	return 0;
 }
 
@@ -392,6 +394,7 @@
 		snd_printk(KERN_ERR "failed to set DRC\n");
 		return -EINVAL;
 	}
+	DBG("(I) succeeded to set DRC (%u, %u)\n", val[0], val[1]);
 	return 0;
 }