diff -Nru alsa-ucm-conf-1.2.2/debian/changelog alsa-ucm-conf-1.2.2/debian/changelog
--- alsa-ucm-conf-1.2.2/debian/changelog	2020-12-18 07:10:56.000000000 +0000
+++ alsa-ucm-conf-1.2.2/debian/changelog	2021-05-25 12:16:51.000000000 +0000
@@ -1,3 +1,10 @@
+alsa-ucm-conf (1.2.2-1ubuntu5.3) UNRELEASED; urgency=medium
+
+  * d/p/0001-HDA-Intel-add-RearMic-JackControl.patch
+    Add "Rear Mic Jack" to make P520 rear mic works correctly. (LP: #1929371)
+
+ -- Jeremy Szu <jeremy.szu@canonical.com>  Tue, 25 May 2021 12:16:51 +0000
+
 alsa-ucm-conf (1.2.2-1ubuntu5.2) groovy; urgency=medium
 
   * d/p/0001-rt715-init-setup-ADC07-to-a-proper-volume.patch
diff -Nru alsa-ucm-conf-1.2.2/debian/patches/0025-HDA-Intel-add-RearMic-JackControl.patch alsa-ucm-conf-1.2.2/debian/patches/0025-HDA-Intel-add-RearMic-JackControl.patch
--- alsa-ucm-conf-1.2.2/debian/patches/0025-HDA-Intel-add-RearMic-JackControl.patch	1970-01-01 00:00:00.000000000 +0000
+++ alsa-ucm-conf-1.2.2/debian/patches/0025-HDA-Intel-add-RearMic-JackControl.patch	2021-05-25 12:14:31.000000000 +0000
@@ -0,0 +1,34 @@
+From: Jeremy Szu <jeremy.szu@canonical.com>
+Date: Tue, 25 May 2021 12:13:37 +0000
+Subject: HDA-Intel-add-RearMic-JackControl
+
+On the LENOVO P520 (dual codecs machine), the Jack name of Rear Mic is
+"Rear Mic Jack".
+
+Below is picked from alsa-info.txt on the LENOVO p520 machine:
+       control.18 {
+               iface CARD
+               name 'Rear Mic Jack'
+               value true
+               comment {
+                       access read
+                       type BOOLEAN
+                       count 1
+               }
+       }
+---
+ ucm2/HDA-Intel/HiFi-dual.conf | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/ucm2/HDA-Intel/HiFi-dual.conf b/ucm2/HDA-Intel/HiFi-dual.conf
+index e0e814f..cff948e 100644
+--- a/ucm2/HDA-Intel/HiFi-dual.conf
++++ b/ucm2/HDA-Intel/HiFi-dual.conf
+@@ -96,6 +96,7 @@ SectionDevice."Mic2" {
+ 		CapturePriority 300
+ 		CapturePCM "hw:${CardId}"
+ 		JackHWMute "Line2"
++		JackControl "Rear Mic Jack"
+ 	}
+ 
+ 	ConflictingDevice [
diff -Nru alsa-ucm-conf-1.2.2/debian/patches/series alsa-ucm-conf-1.2.2/debian/patches/series
--- alsa-ucm-conf-1.2.2/debian/patches/series	2020-12-18 07:10:56.000000000 +0000
+++ alsa-ucm-conf-1.2.2/debian/patches/series	2021-05-25 12:15:02.000000000 +0000
@@ -28,3 +28,4 @@
 
 0001-rt715-init-setup-ADC07-to-a-proper-volume.patch
 
+0025-HDA-Intel-add-RearMic-JackControl.patch