diff --git a/include/gui/SensorManager.h b/include/gui/SensorManager.h
index e1b1a7b..3176462 100644
--- a/include/gui/SensorManager.h
+++ b/include/gui/SensorManager.h
@@ -20,6 +20,8 @@
 #include <stdint.h>
 #include <sys/types.h>
 
+#include <binder/IBinder.h>
+
 #include <utils/Errors.h>
 #include <utils/RefBase.h>
 #include <utils/Singleton.h>
@@ -41,7 +43,9 @@
 
 // ----------------------------------------------------------------------------
 
-class SensorManager : public ASensorManager, public Singleton<SensorManager>
+class SensorManager :
+    public ASensorManager,
+    public Singleton<SensorManager>
 {
 public:
     SensorManager();
@@ -52,9 +56,17 @@
     sp<SensorEventQueue> createEventQueue();
 
 private:
-    sp<ISensorServer> mSensorServer;
-    Sensor const** mSensorList;
-    Vector<Sensor> mSensors;
+    // DeathRecipient interface
+    void sensorManagerDied();
+
+    status_t assertStateLocked() const;
+
+private:
+    mutable Mutex mLock;
+    mutable sp<ISensorServer> mSensorServer;
+    mutable Sensor const** mSensorList;
+    mutable Vector<Sensor> mSensors;
+    mutable sp<IBinder::DeathRecipient> mDeathObserver;
 };
 
 // ----------------------------------------------------------------------------
diff --git a/libs/gui/ISurfaceTexture.cpp b/libs/gui/ISurfaceTexture.cpp
index babd2c0..d2e5627 100644
--- a/libs/gui/ISurfaceTexture.cpp
+++ b/libs/gui/ISurfaceTexture.cpp
@@ -58,13 +58,16 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(bufferIdx);
-        remote()->transact(REQUEST_BUFFER, data, &reply);
+        status_t result =remote()->transact(REQUEST_BUFFER, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
         bool nonNull = reply.readInt32();
         if (nonNull) {
             *buf = new GraphicBuffer();
             reply.read(**buf);
         }
-        status_t result = reply.readInt32();
+        result = reply.readInt32();
         return result;
     }
 
@@ -73,9 +76,12 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(bufferCount);
-        remote()->transact(SET_BUFFER_COUNT, data, &reply);
-        status_t err = reply.readInt32();
-        return err;
+        status_t result =remote()->transact(SET_BUFFER_COUNT, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        result = reply.readInt32();
+        return result;
     }
 
     virtual status_t dequeueBuffer(int *buf, uint32_t w, uint32_t h,
@@ -86,9 +92,12 @@
         data.writeInt32(h);
         data.writeInt32(format);
         data.writeInt32(usage);
-        remote()->transact(DEQUEUE_BUFFER, data, &reply);
+        status_t result = remote()->transact(DEQUEUE_BUFFER, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
         *buf = reply.readInt32();
-        int result = reply.readInt32();
+        result = reply.readInt32();
         return result;
     }
 
@@ -98,11 +107,14 @@
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(buf);
         data.writeInt64(timestamp);
-        remote()->transact(QUEUE_BUFFER, data, &reply);
+        status_t result = remote()->transact(QUEUE_BUFFER, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
         *outWidth = reply.readInt32();
         *outHeight = reply.readInt32();
         *outTransform = reply.readInt32();
-        status_t result = reply.readInt32();
+        result = reply.readInt32();
         return result;
     }
 
@@ -120,8 +132,11 @@
         data.writeFloat(reg.top);
         data.writeFloat(reg.right);
         data.writeFloat(reg.bottom);
-        remote()->transact(SET_CROP, data, &reply);
-        status_t result = reply.readInt32();
+        status_t result = remote()->transact(SET_CROP, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        result = reply.readInt32();
         return result;
     }
 
@@ -129,8 +144,11 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(transform);
-        remote()->transact(SET_TRANSFORM, data, &reply);
-        status_t result = reply.readInt32();
+        status_t result = remote()->transact(SET_TRANSFORM, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        result = reply.readInt32();
         return result;
     }
 
@@ -138,8 +156,11 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(mode);
-        remote()->transact(SET_SCALING_MODE, data, &reply);
-        status_t result = reply.readInt32();
+        status_t result = remote()->transact(SET_SCALING_MODE, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        result = reply.readInt32();
         return result;
     }
 
@@ -147,9 +168,12 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(what);
-        remote()->transact(QUERY, data, &reply);
+        status_t result = remote()->transact(QUERY, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
         value[0] = reply.readInt32();
-        status_t result = reply.readInt32();
+        result = reply.readInt32();
         return result;
     }
 
@@ -157,8 +181,11 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(enabled);
-        remote()->transact(SET_SYNCHRONOUS_MODE, data, &reply);
-        status_t result = reply.readInt32();
+        status_t result = remote()->transact(SET_SYNCHRONOUS_MODE, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        result = reply.readInt32();
         return result;
     }
 
@@ -167,11 +194,14 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(api);
-        remote()->transact(CONNECT, data, &reply);
+        status_t result = remote()->transact(CONNECT, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
         *outWidth = reply.readInt32();
         *outHeight = reply.readInt32();
         *outTransform = reply.readInt32();
-        status_t result = reply.readInt32();
+        result = reply.readInt32();
         return result;
     }
 
@@ -179,8 +209,11 @@
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceTexture::getInterfaceDescriptor());
         data.writeInt32(api);
-        remote()->transact(DISCONNECT, data, &reply);
-        status_t result = reply.readInt32();
+        status_t result =remote()->transact(DISCONNECT, data, &reply);
+        if (result != NO_ERROR) {
+            return result;
+        }
+        result = reply.readInt32();
         return result;
     }
 };
diff --git a/libs/gui/SensorManager.cpp b/libs/gui/SensorManager.cpp
index d719efb..dafcdea 100644
--- a/libs/gui/SensorManager.cpp
+++ b/libs/gui/SensorManager.cpp
@@ -23,6 +23,7 @@
 #include <utils/RefBase.h>
 #include <utils/Singleton.h>
 
+#include <binder/IBinder.h>
 #include <binder/IServiceManager.h>
 
 #include <gui/ISensorServer.h>
@@ -40,17 +41,8 @@
 SensorManager::SensorManager()
     : mSensorList(0)
 {
-    const String16 name("sensorservice");
-    while (getService(name, &mSensorServer) != NO_ERROR) {
-        usleep(250000);
-    }
-
-    mSensors = mSensorServer->getSensorList();
-    size_t count = mSensors.size();
-    mSensorList = (Sensor const**)malloc(count * sizeof(Sensor*));
-    for (size_t i=0 ; i<count ; i++) {
-        mSensorList[i] = mSensors.array() + i;
-    }
+    // okay we're not locked here, but it's not needed during construction
+    assertStateLocked();
 }
 
 SensorManager::~SensorManager()
@@ -58,29 +50,100 @@
     free(mSensorList);
 }
 
+void SensorManager::sensorManagerDied()
+{
+    Mutex::Autolock _l(mLock);
+    mSensorServer.clear();
+    free(mSensorList);
+    mSensorList = NULL;
+    mSensors.clear();
+}
+
+status_t SensorManager::assertStateLocked() const {
+    if (mSensorServer == NULL) {
+        // try for one second
+        const String16 name("sensorservice");
+        for (int i=0 ; i<4 ; i++) {
+            status_t err = getService(name, &mSensorServer);
+            if (err == NAME_NOT_FOUND) {
+                usleep(250000);
+                continue;
+            }
+            if (err != NO_ERROR) {
+                return err;
+            }
+            break;
+        }
+
+        class DeathObserver : public IBinder::DeathRecipient {
+            SensorManager& mSensorManger;
+            virtual void binderDied(const wp<IBinder>& who) {
+                LOGW("sensorservice died [%p]", who.unsafe_get());
+                mSensorManger.sensorManagerDied();
+            }
+        public:
+            DeathObserver(SensorManager& mgr) : mSensorManger(mgr) { }
+        };
+
+        mDeathObserver = new DeathObserver(*const_cast<SensorManager *>(this));
+        mSensorServer->asBinder()->linkToDeath(mDeathObserver);
+
+        mSensors = mSensorServer->getSensorList();
+        size_t count = mSensors.size();
+        mSensorList = (Sensor const**)malloc(count * sizeof(Sensor*));
+        for (size_t i=0 ; i<count ; i++) {
+            mSensorList[i] = mSensors.array() + i;
+        }
+    }
+
+    return NO_ERROR;
+}
+
+
+
 ssize_t SensorManager::getSensorList(Sensor const* const** list) const
 {
+    Mutex::Autolock _l(mLock);
+    status_t err = assertStateLocked();
+    if (err < 0) {
+        return ssize_t(err);
+    }
     *list = mSensorList;
     return mSensors.size();
 }
 
 Sensor const* SensorManager::getDefaultSensor(int type)
 {
-    // For now we just return the first sensor of that type we find.
-    // in the future it will make sense to let the SensorService make
-    // that decision.
-    for (size_t i=0 ; i<mSensors.size() ; i++) {
-        if (mSensorList[i]->getType() == type)
-            return mSensorList[i];
+    Mutex::Autolock _l(mLock);
+    if (assertStateLocked() == NO_ERROR) {
+        // For now we just return the first sensor of that type we find.
+        // in the future it will make sense to let the SensorService make
+        // that decision.
+        for (size_t i=0 ; i<mSensors.size() ; i++) {
+            if (mSensorList[i]->getType() == type)
+                return mSensorList[i];
+        }
     }
     return NULL;
 }
 
 sp<SensorEventQueue> SensorManager::createEventQueue()
 {
-    sp<SensorEventQueue> result = new SensorEventQueue(
-            mSensorServer->createSensorEventConnection());
-    return result;
+    sp<SensorEventQueue> queue;
+
+    Mutex::Autolock _l(mLock);
+    while (assertStateLocked() == NO_ERROR) {
+        sp<ISensorEventConnection> connection =
+                mSensorServer->createSensorEventConnection();
+        if (connection == NULL) {
+            // SensorService just died.
+            LOGE("createEventQueue: connection is NULL. SensorService died.");
+            continue;
+        }
+        queue = new SensorEventQueue(connection);
+        break;
+    }
+    return queue;
 }
 
 // ----------------------------------------------------------------------------
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 1441a54..7c0cd9b 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -451,7 +451,7 @@
     }
 
     const DisplayHardware& hw(graphicPlane(0).displayHardware());
-    if (LIKELY(hw.canDraw() && !isFrozen())) {
+    if (LIKELY(hw.canDraw())) {
         // repaint the framebuffer (if needed)
 
         const int index = hw.getCurrentBufferIndex();
@@ -478,15 +478,13 @@
 
 void SurfaceFlinger::postFramebuffer()
 {
-    if (!mSwapRegion.isEmpty()) {
-        const DisplayHardware& hw(graphicPlane(0).displayHardware());
-        const nsecs_t now = systemTime();
-        mDebugInSwapBuffers = now;
-        hw.flip(mSwapRegion);
-        mLastSwapBufferTime = systemTime() - now;
-        mDebugInSwapBuffers = 0;
-        mSwapRegion.clear();
-    }
+    const DisplayHardware& hw(graphicPlane(0).displayHardware());
+    const nsecs_t now = systemTime();
+    mDebugInSwapBuffers = now;
+    hw.flip(mSwapRegion);
+    mLastSwapBufferTime = systemTime() - now;
+    mDebugInSwapBuffers = 0;
+    mSwapRegion.clear();
 }
 
 void SurfaceFlinger::handleConsoleEvents()