diff --git a/src/conf/cards/YMF744.conf b/src/conf/cards/YMF744.conf
index cc5ec22d..49c459ed 100644
--- a/src/conf/cards/YMF744.conf
+++ b/src/conf/cards/YMF744.conf
@@ -93,6 +93,12 @@ YMF744.pcm.iec958.0 {
 	hooks.0 {
 		type ctl_elems
 		hook_args [
+			{
+				name "IEC958 Playback Switch"
+				lock true
+				preserve true
+				value 1
+			}
 			{
 				interface PCM
 				name "IEC958 Playback PCM Stream"