diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 105fa14..5d9c35a 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -3051,6 +3051,10 @@
 {
     if (!mMasterMute) {
         char value[PROPERTY_VALUE_MAX];
+        if (mOutDeviceTypeAddrs.empty()) {
+            ALOGD("ro.audio.silent is ignored since no output device is set");
+            return;
+        }
         if (isSingleDeviceType(outDeviceTypes(), AUDIO_DEVICE_OUT_REMOTE_SUBMIX)) {
             ALOGD("ro.audio.silent will be ignored for threads on AUDIO_DEVICE_OUT_REMOTE_SUBMIX");
             return;
@@ -4227,6 +4231,7 @@
                          (mPatch.sinks[0].id != sinkPortId);
     mPatch = *patch;
     mOutDeviceTypeAddrs = deviceTypeAddrs;
+    checkSilentMode_l();
 
     if (mOutput->audioHwDev->supportsAudioPatches()) {
         sp<DeviceHalInterface> hwDevice = mOutput->audioHwDev->hwDevice();
@@ -9153,6 +9158,7 @@
         if (isOutput()) {
             sendIoConfigEvent_l(AUDIO_OUTPUT_CONFIG_CHANGED);
             mOutDeviceTypeAddrs = sinkDeviceTypeAddrs;
+            checkSilentMode_l();
         } else {
             sendIoConfigEvent_l(AUDIO_INPUT_CONFIG_CHANGED);
             mInDeviceTypeAddr = sourceDeviceTypeAddr;