diff --git a/src/conf/cards/SI7018.conf b/src/conf/cards/SI7018.conf
index 15972a46..7417bd5b 100644
--- a/src/conf/cards/SI7018.conf
+++ b/src/conf/cards/SI7018.conf
@@ -13,6 +13,7 @@ SI7018.pcm.front.0 {
 	}
 	type hw
 	card $CARD
+	chmap [ "UNKNOWN" "FL,FR" ]
 }	
 
 <confdir:pcm/rear.conf>
@@ -26,6 +27,7 @@ SI7018.pcm.rear.0 {
 	slave.pcm {
 		type hw
 		card $CARD
+		chmap [ "UNKNOWN" "RL,RR" ]
 	}
 	hooks.0 {
 		type ctl_elems
diff --git a/src/conf/cards/TRID4DWAVENX.conf b/src/conf/cards/TRID4DWAVENX.conf
index bbf6b7cb..717b1408 100644
--- a/src/conf/cards/TRID4DWAVENX.conf
+++ b/src/conf/cards/TRID4DWAVENX.conf
@@ -11,6 +11,7 @@ TRID4DWAVENX.pcm.front.0 {
 	}
 	type hw
 	card $CARD
+	chmap [ "UNKNOWN" "FL,FR" ]
 }	
 
 <confdir:pcm/rear.conf>
@@ -24,6 +25,7 @@ TRID4DWAVENX.pcm.rear.0 {
 	slave.pcm {
 		type hw
 		card $CARD
+		chmap [ "UNKNOWN" "RL,RR" ]
 	}
 	hooks.0 {
 		type ctl_elems