Index: dev/pci/azalia.c
===================================================================
RCS file: /home/cvs/src/sys/dev/pci/azalia.c,v
retrieving revision 1.266
diff -u -p -r1.266 azalia.c
--- dev/pci/azalia.c	30 Oct 2021 03:24:59 -0000	1.266
+++ dev/pci/azalia.c	9 Nov 2021 21:37:03 -0000
@@ -279,6 +279,9 @@ int	azalia_suspend(azalia_t *);
 int	azalia_resume(azalia_t *);
 int	azalia_resume_codec(codec_t *);
 
+/* sysctl */
+int audio_hdmi_enable = 0;
+
 /* variables */
 struct cfattach azalia_ca = {
 	sizeof(azalia_t), azalia_pci_match, azalia_pci_attach,
@@ -954,9 +957,10 @@ azalia_init_codecs(azalia_t *az)
 	c = -1;
 	for (i = 0; i < az->ncodecs; i++) {
 		codec = &az->codecs[i];
-		if ((codec->audiofunc < 0) ||
-		    (codec->codec_type == AZ_CODEC_TYPE_HDMI))
-			continue;
+		if(audio_hdmi_enable)
+			if ((codec->audiofunc < 0) ||
+				(codec->codec_type == AZ_CODEC_TYPE_HDMI))
+					continue;
 		if (codec->codec_type == AZ_CODEC_TYPE_DIGITAL) {
 			if (c < 0)
 				c = i;
Index: kern/init_sysent.c
===================================================================
RCS file: /home/cvs/src/sys/kern/init_sysent.c,v
retrieving revision 1.230
diff -u -p -r1.230 init_sysent.c
--- kern/init_sysent.c	27 Oct 2021 03:25:11 -0000	1.230
+++ kern/init_sysent.c	9 Nov 2021 22:05:42 -0000
@@ -1,4 +1,4 @@
-/*	$OpenBSD: init_sysent.c,v 1.230 2021/10/27 03:25:11 visa Exp $	*/
+/*	$OpenBSD$	*/
 
 /*
  * System call switch table.
Index: kern/kern_sysctl.c
===================================================================
RCS file: /home/cvs/src/sys/kern/kern_sysctl.c,v
retrieving revision 1.396
diff -u -p -r1.396 kern_sysctl.c
--- kern/kern_sysctl.c	30 Oct 2021 23:24:48 -0000	1.396
+++ kern/kern_sysctl.c	9 Nov 2021 21:23:30 -0000
@@ -126,6 +126,7 @@ extern fixpt_t ccpu;
 extern long numvnodes;
 extern int allowdt;
 extern int audio_record_enable;
+extern int audio_hdmi_enable;
 extern int video_record_enable;
 
 int allowkmem;
@@ -2427,13 +2428,17 @@ int
 sysctl_audio(int *name, u_int namelen, void *oldp, size_t *oldlenp,
     void *newp, size_t newlen)
 {
+	int error = 0;
 	if (namelen != 1)
 		return (ENOTDIR);
 
-	if (name[0] != KERN_AUDIO_RECORD)
-		return (ENOENT);
+	if (name[0] == KERN_AUDIO_RECORD)
+		error = sysctl_int(oldp, oldlenp, newp, newlen, &audio_record_enable);
 
-	return (sysctl_int(oldp, oldlenp, newp, newlen, &audio_record_enable));
+	if (name[0] == KERN_AUDIO_HDMI)
+		error = sysctl_int(oldp, oldlenp, newp, newlen, &audio_hdmi_enable);
+
+	return (error);
 }
 #endif
 
Index: sys/sysctl.h
===================================================================
RCS file: /home/cvs/src/sys/sys/sysctl.h,v
retrieving revision 1.219
diff -u -p -r1.219 sysctl.h
--- sys/sysctl.h	30 Oct 2021 23:24:48 -0000	1.219
+++ sys/sysctl.h	7 Nov 2021 18:52:34 -0000
@@ -317,11 +317,13 @@ struct ctlname {
  * KERN_AUDIO
  */
 #define KERN_AUDIO_RECORD	1
-#define KERN_AUDIO_MAXID	2
+#define KERN_AUDIO_HDMI		2
+#define KERN_AUDIO_MAXID	3
 
 #define CTL_KERN_AUDIO_NAMES { \
 	{ 0, 0 }, \
 	{ "record", CTLTYPE_INT }, \
+	{ "hdmi", CTLTYPE_INT }, \
 }
 
 /*