diff -Nru alsa-lib-1.1.3/debian/changelog alsa-lib-1.1.3/debian/changelog
--- alsa-lib-1.1.3/debian/changelog	2020-03-27 02:26:30.000000000 +0000
+++ alsa-lib-1.1.3/debian/changelog	2021-06-22 10:01:54.000000000 +0000
@@ -1,3 +1,14 @@
+alsa-lib (1.1.3-5ubuntu0.6) bionic; urgency=medium
+
+  * d/p/0021-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch
+    https://github.com/alsa-project/alsa-lib/pull/122
+    Add "Cmedia Audio" to USB-Audio.pcm.iec958_device, otherwise users
+    will see 2 IEC985 devices from UI, but there is no those physical
+    devices in fact. After adding this patch, those 2 IEC985 devices will
+    not show up in the UI. (LP: #1921452)
+
+ -- Hui Wang <hui.wang@canonical.com>  Tue, 22 Jun 2021 10:01:54 +0000
+
 alsa-lib (1.1.3-5ubuntu0.5) bionic; urgency=medium
 
   * d/p/0020-add-bios-version-for-looking-for-ucm.patch
diff -Nru alsa-lib-1.1.3/debian/patches/0021-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch alsa-lib-1.1.3/debian/patches/0021-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch
--- alsa-lib-1.1.3/debian/patches/0021-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch	1970-01-01 00:00:00.000000000 +0000
+++ alsa-lib-1.1.3/debian/patches/0021-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch	2021-06-22 10:01:31.000000000 +0000
@@ -0,0 +1,12 @@
+Index: alsa-lib-1.1.3/src/conf/cards/USB-Audio.conf
+===================================================================
+--- alsa-lib-1.1.3.orig/src/conf/cards/USB-Audio.conf
++++ alsa-lib-1.1.3/src/conf/cards/USB-Audio.conf
+@@ -42,6 +42,7 @@ USB-Audio.pcm.iec958_device {
+ 	# The below don't have digital in/out, so prevent them from being opened.
+ 	"Andrea PureAudio USB-SA Headset" 999
+ 	"Blue Snowball" 999
++	"Cmedia Audio" 999
+ 	"HP Digital Stereo Headset" 999
+ 	"GN 9330" 999
+ 	"Logitech Speaker Lapdesk N700" 999
diff -Nru alsa-lib-1.1.3/debian/patches/series alsa-lib-1.1.3/debian/patches/series
--- alsa-lib-1.1.3/debian/patches/series	2020-03-27 02:26:30.000000000 +0000
+++ alsa-lib-1.1.3/debian/patches/series	2021-06-22 10:01:47.000000000 +0000
@@ -18,3 +18,4 @@
 0018-add-ucm-for-sof-driver-LenovoX1-7th-and-Dell-cml.patch
 0019-adjust-input-volume-and-a-new-LENOVO-ucm.patch
 0020-add-bios-version-for-looking-for-ucm.patch
+0021-conf-USB-add-Cmedia-Audio-to-USB-Audio.pcm.iec958_de.patch