From fed604b2412ffc7865c7f72ef4d32181327850b6 Mon Sep 17 00:00:00 2001
From: aiminick <83101338@qq.com>
Date: Mon, 18 Nov 2019 21:36:22 +0800
Subject: [PATCH] Update README.md

---
 README.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/README.md b/README.md
index 770e870..b2cbd6f 100644
--- a/README.md
+++ b/README.md
@@ -1206,6 +1206,15 @@ amixer cset numid=3 2
 ## The default setting is 0, which represents automatic selection.
 ```
 
+After you have finished modifying your audio settings, you need to restart your Raspberry Pi in order for your changes to take effect.
+
+**If you're still not getting sound via HDMI:**
+
+In some rare cases, it is necessary to edit config.txt to force HDMI mode (as opposed to DVI mode, which does not send sound). 
+
+You can do this by editing **/boot/config.txt** and setting **hdmi_drive=2** , then rebooting for the change to take effect.
+
+
 ### 3-12. 32-Bit Software Armhf Support
 
 ```