assuming hdmi audio and setting it to not auto shutoff

busunit/rootfs/etc/rc.local

@@ -36,7 +36,7 @@ sleep 2
 sleep 2
 
 ## If using HDMI sound, uncomment the following two lines...
-#vcgencmd force_audio hdmi 1 2>&1 >> /tmp/audio.log &
-#sleep 1
+vcgencmd force_audio hdmi 1 2>&1 >> /tmp/audio.log &
+sleep 1
 
 exit 0