diff --git a/include/media/AudioTrack.h b/include/media/AudioTrack.h
index 69dc062..4de55a2 100644
--- a/include/media/AudioTrack.h
+++ b/include/media/AudioTrack.h
@@ -836,6 +836,8 @@
             // check sample rate and speed is compatible with AudioTrack
             bool     isSampleRateSpeedAllowed_l(uint32_t sampleRate, float speed) const;
 
+            void     restartIfDisabled();
+
     // Next 4 fields may be changed if IAudioTrack is re-created, but always != 0
     sp<IAudioTrack>         mAudioTrack;
     sp<IMemory>             mCblkMemory;
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h
index ea8a78e..2dfb850 100644
--- a/include/private/media/AudioTrackShared.h
+++ b/include/private/media/AudioTrackShared.h
@@ -268,6 +268,8 @@
     //  DEAD_OBJECT Server has died or invalidated, caller should destroy this proxy and re-create.
     //  -EINTR      Call has been interrupted.  Look around to see why, and then perhaps try again.
     //  NO_INIT     Shared memory is corrupt.
+    //  NOT_ENOUGH_DATA Server has disabled the track because of underrun: restart the track
+    //              if still in active state.
     // Assertion failure on entry, if buffer == NULL or buffer->mFrameCount == 0.
     status_t    obtainBuffer(Buffer* buffer, const struct timespec *requested = NULL,
             struct timespec *elapsed = NULL);
diff --git a/media/libmedia/AudioTrack.cpp b/media/libmedia/AudioTrack.cpp
index 423273d..ab18c27 100644
--- a/media/libmedia/AudioTrack.cpp
+++ b/media/libmedia/AudioTrack.cpp
@@ -1532,6 +1532,10 @@
             }
             oldSequence = newSequence;
 
+            if (status == NOT_ENOUGH_DATA) {
+                restartIfDisabled();
+            }
+
             // Keep the extra references
             proxy = mProxy;
             iMem = mCblkMemory;
@@ -1554,8 +1558,7 @@
         buffer.mFrameCount = audioBuffer->frameCount;
         // FIXME starts the requested timeout and elapsed over from scratch
         status = proxy->obtainBuffer(&buffer, requested, elapsed);
-
-    } while ((status == DEAD_OBJECT) && (tryCounter-- > 0));
+    } while (((status == DEAD_OBJECT) || (status == NOT_ENOUGH_DATA)) && (tryCounter-- > 0));
 
     audioBuffer->frameCount = buffer.mFrameCount;
     audioBuffer->size = buffer.mFrameCount * mFrameSize;
@@ -1588,13 +1591,16 @@
     mProxy->releaseBuffer(&buffer);
 
     // restart track if it was disabled by audioflinger due to previous underrun
-    if (mState == STATE_ACTIVE) {
-        audio_track_cblk_t* cblk = mCblk;
-        if (android_atomic_and(~CBLK_DISABLED, &cblk->mFlags) & CBLK_DISABLED) {
-            ALOGW("releaseBuffer() track %p disabled due to previous underrun, restarting", this);
-            // FIXME ignoring status
-            mAudioTrack->start();
-        }
+    restartIfDisabled();
+}
+
+void AudioTrack::restartIfDisabled()
+{
+    int32_t flags = android_atomic_and(~CBLK_DISABLED, &mCblk->mFlags);
+    if ((mState == STATE_ACTIVE) && (flags & CBLK_DISABLED)) {
+        ALOGW("releaseBuffer() track %p disabled due to previous underrun, restarting", this);
+        // FIXME ignoring status
+        mAudioTrack->start();
     }
 }
 
diff --git a/media/libmedia/AudioTrackShared.cpp b/media/libmedia/AudioTrackShared.cpp
index 1d15495..6b6865b 100644
--- a/media/libmedia/AudioTrackShared.cpp
+++ b/media/libmedia/AudioTrackShared.cpp
@@ -129,6 +129,11 @@
             status = DEAD_OBJECT;
             goto end;
         }
+        if (flags & CBLK_DISABLED) {
+            ALOGV("Track disabled");
+            status = NOT_ENOUGH_DATA;
+            goto end;
+        }
         // check for obtainBuffer interrupted by client
         if (!ignoreInitialPendingInterrupt && (flags & CBLK_INTERRUPT)) {
             ALOGV("obtainBuffer() interrupted by client");
@@ -425,7 +430,8 @@
             status = DEAD_OBJECT;
             goto end;
         }
-        if (flags & CBLK_STREAM_END_DONE) {
+        // a track is not supposed to underrun at this stage but consider it done
+        if (flags & (CBLK_STREAM_END_DONE | CBLK_DISABLED)) {
             ALOGV("stream end received");
             status = NO_ERROR;
             goto end;
diff --git a/services/audioflinger/PlaybackTracks.h b/services/audioflinger/PlaybackTracks.h
index fa61af2..6e0c46d 100644
--- a/services/audioflinger/PlaybackTracks.h
+++ b/services/audioflinger/PlaybackTracks.h
@@ -110,10 +110,13 @@
     // audioHalFrames is derived from output latency
     // FIXME parameters not needed, could get them from the thread
     bool presentationComplete(int64_t framesWritten, size_t audioHalFrames);
+    void signalClientFlag(int32_t flag);
 
 public:
     void triggerEvents(AudioSystem::sync_event_t type);
     void invalidate();
+    void disable();
+
     bool isInvalid() const { return mIsInvalid; }
     int fastIndex() const { return mFastIndex; }
 
@@ -200,6 +203,8 @@
                                      uint32_t waitTimeMs);
     void                clearBufferQueue();
 
+    void                restartIfDisabled();
+
     // Maximum number of pending buffers allocated by OutputTrack::write()
     static const uint8_t kMaxOverFlowBuffers = 10;
 
@@ -224,6 +229,10 @@
                                    IAudioFlinger::track_flags_t flags);
     virtual             ~PatchTrack();
 
+    virtual status_t    start(AudioSystem::sync_event_t event =
+                                    AudioSystem::SYNC_EVENT_NONE,
+                             int triggerSession = 0);
+
     // AudioBufferProvider interface
     virtual status_t getNextBuffer(AudioBufferProvider::Buffer* buffer);
     virtual void releaseBuffer(AudioBufferProvider::Buffer* buffer);
@@ -236,6 +245,8 @@
             void setPeerProxy(PatchProxyBufferProvider *proxy) { mPeerProxy = proxy; }
 
 private:
+            void restartIfDisabled();
+
     sp<ClientProxy>             mProxy;
     PatchProxyBufferProvider*   mPeerProxy;
     struct timespec             mPeerTimeout;
diff --git a/services/audioflinger/Threads.cpp b/services/audioflinger/Threads.cpp
index 96c5f59..f206e96 100644
--- a/services/audioflinger/Threads.cpp
+++ b/services/audioflinger/Threads.cpp
@@ -1113,7 +1113,7 @@
         status_t status;
         status = mPowerManager->updateWakeLockUids(mWakeLockToken, uids.size(), uids.array(),
                     true /* FIXME force oneway contrary to .aidl */);
-        ALOGV("acquireWakeLock_l() %s status %d", mThreadName, status);
+        ALOGV("updateWakeLockUids_l() %s status %d", mThreadName, status);
     }
 }
 
@@ -3961,7 +3961,7 @@
                     }
                     // indicate to client process that the track was disabled because of underrun;
                     // it will then automatically call start() when data is available
-                    android_atomic_or(CBLK_DISABLED, &track->mCblk->mFlags);
+                    track->disable();
                     // remove from active list, but state remains ACTIVE [confusing but true]
                     isActive = false;
                     break;
@@ -4322,7 +4322,7 @@
                     tracksToRemove->add(track);
                     // indicate to client process that the track was disabled because of underrun;
                     // it will then automatically call start() when data is available
-                    android_atomic_or(CBLK_DISABLED, &cblk->mFlags);
+                    track->disable();
                 // If one track is not ready, mark the mixer also not ready if:
                 //  - the mixer was ready during previous round OR
                 //  - no other track is ready
@@ -4869,7 +4869,7 @@
                     tracksToRemove->add(track);
                     // indicate to client process that the track was disabled because of underrun;
                     // it will then automatically call start() when data is available
-                    android_atomic_or(CBLK_DISABLED, &cblk->mFlags);
+                    track->disable();
                 } else if (last) {
                     ALOGW("pause because of UNDERRUN, framesReady = %zu,"
                             "minFrames = %u, mFormat = %#x",
@@ -5423,7 +5423,7 @@
                     tracksToRemove->add(track);
                     // indicate to client process that the track was disabled because of underrun;
                     // it will then automatically call start() when data is available
-                    android_atomic_or(CBLK_DISABLED, &cblk->mFlags);
+                    track->disable();
                 } else if (last){
                     mixerStatus = MIXER_TRACKS_ENABLED;
                 }
diff --git a/services/audioflinger/Tracks.cpp b/services/audioflinger/Tracks.cpp
index 8b49062..0c51e81 100644
--- a/services/audioflinger/Tracks.cpp
+++ b/services/audioflinger/Tracks.cpp
@@ -1027,13 +1027,23 @@
 
 void AudioFlinger::PlaybackThread::Track::invalidate()
 {
+    signalClientFlag(CBLK_INVALID);
+    mIsInvalid = true;
+}
+
+void AudioFlinger::PlaybackThread::Track::disable()
+{
+    signalClientFlag(CBLK_DISABLED);
+}
+
+void AudioFlinger::PlaybackThread::Track::signalClientFlag(int32_t flag)
+{
     // FIXME should use proxy, and needs work
     audio_track_cblk_t* cblk = mCblk;
-    android_atomic_or(CBLK_INVALID, &cblk->mFlags);
+    android_atomic_or(flag, &cblk->mFlags);
     android_atomic_release_store(0x40000000, &cblk->mFutex);
     // client is not in server, so FUTEX_WAKE is needed instead of FUTEX_WAKE_PRIVATE
     (void) syscall(__NR_futex, &cblk->mFutex, FUTEX_WAKE, INT_MAX);
-    mIsInvalid = true;
 }
 
 void AudioFlinger::PlaybackThread::Track::signal()
@@ -1199,7 +1209,7 @@
             mOutBuffer.frameCount = pInBuffer->frameCount;
             nsecs_t startTime = systemTime();
             status_t status = obtainBuffer(&mOutBuffer, waitTimeLeftMs);
-            if (status != NO_ERROR) {
+            if (status != NO_ERROR && status != NOT_ENOUGH_DATA) {
                 ALOGV("OutputTrack::write() %p thread %p no more output buffers; status %d", this,
                         mThread.unsafe_get(), status);
                 outputBufferFull = true;
@@ -1211,6 +1221,10 @@
             } else {
                 waitTimeLeftMs = 0;
             }
+            if (status == NOT_ENOUGH_DATA) {
+                restartIfDisabled();
+                continue;
+            }
         }
 
         uint32_t outFrames = pInBuffer->frameCount > mOutBuffer.frameCount ? mOutBuffer.frameCount :
@@ -1220,6 +1234,7 @@
         buf.mFrameCount = outFrames;
         buf.mRaw = NULL;
         mClientProxy->releaseBuffer(&buf);
+        restartIfDisabled();
         pInBuffer->frameCount -= outFrames;
         pInBuffer->raw = (int8_t *)pInBuffer->raw + outFrames * mFrameSize;
         mOutBuffer.frameCount -= outFrames;
@@ -1293,6 +1308,13 @@
     mBufferQueue.clear();
 }
 
+void AudioFlinger::PlaybackThread::OutputTrack::restartIfDisabled()
+{
+    int32_t flags = android_atomic_and(~CBLK_DISABLED, &mCblk->mFlags);
+    if (mActive && (flags & CBLK_DISABLED)) {
+        start();
+    }
+}
 
 AudioFlinger::PlaybackThread::PatchTrack::PatchTrack(PlaybackThread *playbackThread,
                                                      audio_stream_type_t streamType,
@@ -1322,6 +1344,17 @@
 {
 }
 
+status_t AudioFlinger::PlaybackThread::PatchTrack::start(AudioSystem::sync_event_t event,
+                                                          int triggerSession)
+{
+    status_t status = Track::start(event, triggerSession);
+    if (status != NO_ERROR) {
+        return status;
+    }
+    android_atomic_and(~CBLK_DISABLED, &mCblk->mFlags);
+    return status;
+}
+
 // AudioBufferProvider interface
 status_t AudioFlinger::PlaybackThread::PatchTrack::getNextBuffer(
         AudioBufferProvider::Buffer* buffer)
@@ -1352,17 +1385,31 @@
 status_t AudioFlinger::PlaybackThread::PatchTrack::obtainBuffer(Proxy::Buffer* buffer,
                                                                 const struct timespec *timeOut)
 {
-    return mProxy->obtainBuffer(buffer, timeOut);
+    status_t status = NO_ERROR;
+    static const int32_t kMaxTries = 5;
+    int32_t tryCounter = kMaxTries;
+    do {
+        if (status == NOT_ENOUGH_DATA) {
+            restartIfDisabled();
+        }
+        status = mProxy->obtainBuffer(buffer, timeOut);
+    } while ((status == NOT_ENOUGH_DATA) && (tryCounter-- > 0));
+    return status;
 }
 
 void AudioFlinger::PlaybackThread::PatchTrack::releaseBuffer(Proxy::Buffer* buffer)
 {
     mProxy->releaseBuffer(buffer);
+    restartIfDisabled();
+    android_atomic_or(CBLK_FORCEREADY, &mCblk->mFlags);
+}
+
+void AudioFlinger::PlaybackThread::PatchTrack::restartIfDisabled()
+{
     if (android_atomic_and(~CBLK_DISABLED, &mCblk->mFlags) & CBLK_DISABLED) {
         ALOGW("PatchTrack::releaseBuffer() disabled due to previous underrun, restarting");
         start();
     }
-    android_atomic_or(CBLK_FORCEREADY, &mCblk->mFlags);
 }
 
 // ----------------------------------------------------------------------------