From 5a77dfd8e3108778b93ef0e519fd775021b01ea9 Mon Sep 17 00:00:00 2001
From: Hugo Villeneuve <hugo@hugovil.com>
Date: Thu, 15 Feb 2024 11:14:57 -0500
Subject: [PATCH] rpi: prevent HDMI connection sound output

---
 raspberrypi/recipes-bsp/bootfiles/rpi-config_git.bbappend | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/raspberrypi/recipes-bsp/bootfiles/rpi-config_git.bbappend b/raspberrypi/recipes-bsp/bootfiles/rpi-config_git.bbappend
index b9f3a50..ea3c6d4 100644
--- a/raspberrypi/recipes-bsp/bootfiles/rpi-config_git.bbappend
+++ b/raspberrypi/recipes-bsp/bootfiles/rpi-config_git.bbappend
@@ -1,7 +1,11 @@
 do_deploy:append() {
-    # Enable alsa audio support
+    # Enable Pi’s on-board sound card (load snd_bcm2835):
     sed -i 's/^#\(dtparam=audio=\).*/\1on/' $CONFIG
 
-    # Force ALSA to use analogue output:
+    # Pretends all audio formats are unsupported by display. This
+    # forces ALSA to use analogue output:
     sed -i 's/^#\(hdmi_ignore_edid_audio=\).*/\11/' $CONFIG
+
+    # Prevent any HDMI connection from transmitting sound output:
+    sed -i 's/^\(.*dtoverlay=vc4-kms-v3d\).*/\1,noaudio/' $CONFIG
 }
-- 
2.20.1