diff -Nru alsa-lib-1.2.3.2/debian/changelog alsa-lib-1.2.3.2/debian/changelog
--- alsa-lib-1.2.3.2/debian/changelog	2020-08-25 13:13:28.000000000 +0000
+++ alsa-lib-1.2.3.2/debian/changelog	2020-10-15 00:50:24.000000000 +0000
@@ -1,3 +1,11 @@
+alsa-lib (1.2.3.2-1ubuntu2) groovy; urgency=medium
+
+  * d/p/0001-control-ctlparse-fix-enum-values-in-or.patch
+  - Fix ctl parsing for enum value setting, let it support both
+    "" and '' (LP: #1899857)
+
+ -- Hui Wang <hui.wang@canonical.com>  Thu, 15 Oct 2020 00:50:24 +0000
+
 alsa-lib (1.2.3.2-1ubuntu1) groovy; urgency=medium
 
   * d/p/0001-conf-USB-Audio-Disable-IEC958-on-Lenovo-ThinkStation.patch:
diff -Nru alsa-lib-1.2.3.2/debian/patches/0001-control-ctlparse-fix-enum-values-in-or.patch alsa-lib-1.2.3.2/debian/patches/0001-control-ctlparse-fix-enum-values-in-or.patch
--- alsa-lib-1.2.3.2/debian/patches/0001-control-ctlparse-fix-enum-values-in-or.patch	1970-01-01 00:00:00.000000000 +0000
+++ alsa-lib-1.2.3.2/debian/patches/0001-control-ctlparse-fix-enum-values-in-or.patch	2020-10-15 00:49:52.000000000 +0000
@@ -0,0 +1,62 @@
+From da1ff0f4943b04e2ebcd619ef03442279ae30374 Mon Sep 17 00:00:00 2001
+From: Jaroslav Kysela <perex@perex.cz>
+Date: Mon, 27 Jul 2020 13:18:20 +0200
+Subject: [PATCH] control: ctlparse - fix enum values in '' or ""
+
+This comit fixes the enum value string parser
+(fixes aaf3a081bff1cc85635f7a3c3d4287c4addbbd84).
+
+BugLink: https://github.com/alsa-project/alsa-ucm-conf/pull/40
+Signed-off-by: Jaroslav Kysela <perex@perex.cz>
+(cherry picked from commit a3ca4803cb8db73d01231c69620e2d18573ffba9)
+Signed-off-by: Hui Wang <hui.wang@canonical.com>
+---
+ src/control/ctlparse.c | 26 +++++++++++++++-----------
+ 1 file changed, 15 insertions(+), 11 deletions(-)
+
+diff --git a/src/control/ctlparse.c b/src/control/ctlparse.c
+index ee1e0602..74f76cca 100644
+--- a/src/control/ctlparse.c
++++ b/src/control/ctlparse.c
+@@ -282,23 +282,27 @@ static int get_ctl_enum_item_index(snd_ctl_t *handle,
+ 	if (items <= 0)
+ 		return -1;
+ 
++	end = *ptr;
++	if (end == '\'' || end == '"')
++		ptr++;
++	else
++		end = '\0';
++
+ 	for (i = 0; i < items; i++) {
+ 		snd_ctl_elem_info_set_item(info, i);
+ 		if (snd_ctl_elem_info(handle, info) < 0)
+ 			return -1;
+ 		name = snd_ctl_elem_info_get_item_name(info);
+-		end = *ptr;
+-		if (end == '\'' || end == '"')
+-			ptr++;
+-		else
+-			end = '\0';
+ 		len = strlen(name);
+-		if (strncmp(name, ptr, len) == 0) {
+-			if (ptr[len] == end || ptr[len] == ',' || ptr[len] == '\n') {
+-				ptr += len;
+-				*ptrp = ptr;
+-				return i;
+-			}
++		if (strncmp(name, ptr, len))
++			continue;
++		if (end == '\0' && (ptr[len] == '\0' || ptr[len] == ',' || ptr[len] == '\n')) {
++			*ptrp = ptr + len;
++			return i;
++		}
++		if (end != '\0' && ptr[len] == end) {
++			*ptrp = ptr + len + 1;
++			return i;
+ 		}
+ 	}
+ 	return -1;
+-- 
+2.25.1
+
diff -Nru alsa-lib-1.2.3.2/debian/patches/series alsa-lib-1.2.3.2/debian/patches/series
--- alsa-lib-1.2.3.2/debian/patches/series	2020-08-25 13:13:20.000000000 +0000
+++ alsa-lib-1.2.3.2/debian/patches/series	2020-10-15 00:50:02.000000000 +0000
@@ -1,3 +1,5 @@
 0001-Enabled-extended-namehints-in-alsa.conf.patch
 
 0001-conf-USB-Audio-Disable-IEC958-on-Lenovo-ThinkStation.patch
+
+0001-control-ctlparse-fix-enum-values-in-or.patch