diff --git a/services/surfaceflinger/DisplayDevice.cpp b/services/surfaceflinger/DisplayDevice.cpp
index 71377ed..e3e0b0a 100644
--- a/services/surfaceflinger/DisplayDevice.cpp
+++ b/services/surfaceflinger/DisplayDevice.cpp
@@ -72,7 +72,8 @@
       mSecureLayerVisible(false),
       mLayerStack(NO_LAYER_STACK),
       mOrientation(),
-      mPowerMode(HWC_POWER_MODE_OFF)
+      mPowerMode(HWC_POWER_MODE_OFF),
+      mActiveConfig(0)
 {
     mNativeWindow = new Surface(producer, false);
     ANativeWindow* const window = mNativeWindow.get();
@@ -336,6 +337,15 @@
 }
 
 // ----------------------------------------------------------------------------
+void DisplayDevice::setActiveConfig(int mode) {
+    mActiveConfig = mode;
+}
+
+int DisplayDevice::getActiveConfig()  const {
+    return mActiveConfig;
+}
+
+// ----------------------------------------------------------------------------
 
 void DisplayDevice::setLayerStack(uint32_t stack) {
     mLayerStack = stack;
@@ -461,13 +471,14 @@
     result.appendFormat(
         "+ DisplayDevice: %s\n"
         "   type=%x, hwcId=%d, layerStack=%u, (%4dx%4d), ANativeWindow=%p, orient=%2d (type=%08x), "
-        "flips=%u, isSecure=%d, secureVis=%d, powerMode=%d, numLayers=%zu\n"
+        "flips=%u, isSecure=%d, secureVis=%d, powerMode=%d, activeConfig=%d, numLayers=%zu\n"
         "   v:[%d,%d,%d,%d], f:[%d,%d,%d,%d], s:[%d,%d,%d,%d],"
         "transform:[[%0.3f,%0.3f,%0.3f][%0.3f,%0.3f,%0.3f][%0.3f,%0.3f,%0.3f]]\n",
         mDisplayName.string(), mType, mHwcDisplayId,
         mLayerStack, mDisplayWidth, mDisplayHeight, mNativeWindow.get(),
         mOrientation, tr.getType(), getPageFlipCount(),
-        mIsSecure, mSecureLayerVisible, mPowerMode, mVisibleLayersSortedByZ.size(),
+        mIsSecure, mSecureLayerVisible, mPowerMode, mActiveConfig,
+        mVisibleLayersSortedByZ.size(),
         mViewport.left, mViewport.top, mViewport.right, mViewport.bottom,
         mFrame.left, mFrame.top, mFrame.right, mFrame.bottom,
         mScissor.left, mScissor.top, mScissor.right, mScissor.bottom,
diff --git a/services/surfaceflinger/DisplayDevice.h b/services/surfaceflinger/DisplayDevice.h
index 4c8ef02..615ca28 100644
--- a/services/surfaceflinger/DisplayDevice.h
+++ b/services/surfaceflinger/DisplayDevice.h
@@ -153,6 +153,12 @@
     void setPowerMode(int mode);
     bool isDisplayOn() const;
 
+    /* ------------------------------------------------------------------------
+     * Display active config management.
+     */
+    int getActiveConfig() const;
+    void setActiveConfig(int mode);
+
     // release HWC resources (if any) for removable displays
     void disconnect(HWComposer& hwc);
 
@@ -215,6 +221,8 @@
     bool mNeedsFiltering;
     // Current power mode
     int mPowerMode;
+    // Current active config
+    int mActiveConfig;
 };
 
 }; // namespace android
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.cpp b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
index a8fb5bd..5e3fe92 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.cpp
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.cpp
@@ -778,6 +778,16 @@
     return NO_ERROR;
 }
 
+status_t HWComposer::setActiveConfig(int disp, int mode) {
+    LOG_FATAL_IF(disp >= VIRTUAL_DISPLAY_ID_BASE);
+    if (mHwc && hwcHasApiVersion(mHwc, HWC_DEVICE_API_VERSION_1_4)) {
+        return (status_t)mHwc->setActiveConfig(mHwc, disp, mode);
+    } else {
+        LOG_FATAL_IF(mode != 0);
+    }
+    return NO_ERROR;
+}
+
 void HWComposer::disconnectDisplay(int disp) {
     LOG_ALWAYS_FATAL_IF(disp < 0 || disp == HWC_DISPLAY_PRIMARY);
     DisplayData& dd(mDisplayData[disp]);
diff --git a/services/surfaceflinger/DisplayHardware/HWComposer.h b/services/surfaceflinger/DisplayHardware/HWComposer.h
index 9bd99eb..5cb56a0 100644
--- a/services/surfaceflinger/DisplayHardware/HWComposer.h
+++ b/services/surfaceflinger/DisplayHardware/HWComposer.h
@@ -100,6 +100,9 @@
     // set power mode
     status_t setPowerMode(int disp, int mode);
 
+    // set active config
+    status_t setActiveConfig(int disp, int mode);
+
     // reset state when an external, non-virtual display is disconnected
     void disconnectDisplay(int disp);
 
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 53b0dc4..80cf643 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -603,11 +603,55 @@
     return NO_ERROR;
 }
 
-int SurfaceFlinger::getActiveConfig(const sp<IBinder>&) {
-    return 0;
+int SurfaceFlinger::getActiveConfig(const sp<IBinder>& display) {
+    return getDisplayDevice(display)->getActiveConfig();
 }
 
-status_t SurfaceFlinger::setActiveConfig(const sp<IBinder>&, int) {
+void SurfaceFlinger::setActiveConfigInternal(const sp<DisplayDevice>& hw, int mode) {
+    ALOGD("Set active config mode=%d, type=%d flinger=%p", mode, hw->getDisplayType(),
+          this);
+    int32_t type = hw->getDisplayType();
+    int currentMode = hw->getActiveConfig();
+
+    if (mode == currentMode) {
+        ALOGD("Screen type=%d is already mode=%d", hw->getDisplayType(), mode);
+        return;
+    }
+
+    if (type >= DisplayDevice::NUM_BUILTIN_DISPLAY_TYPES) {
+        ALOGW("Trying to set config for virtual display");
+        return;
+    }
+
+    hw->setActiveConfig(mode);
+    getHwComposer().setActiveConfig(type, mode);
+}
+
+status_t SurfaceFlinger::setActiveConfig(const sp<IBinder>& display, int mode) {
+    class MessageSetActiveConfig: public MessageBase {
+        SurfaceFlinger& mFlinger;
+        sp<IBinder> mDisplay;
+        int mMode;
+    public:
+        MessageSetActiveConfig(SurfaceFlinger& flinger, const sp<IBinder>& disp,
+                               int mode) :
+            mFlinger(flinger), mDisplay(disp) { mMode = mode; }
+        virtual bool handler() {
+            sp<DisplayDevice> hw(mFlinger.getDisplayDevice(mDisplay));
+            if (hw == NULL) {
+                ALOGE("Attempt to set active config = %d for null display %p",
+                        mDisplay.get(), mMode);
+            } else if (hw->getDisplayType() >= DisplayDevice::DISPLAY_VIRTUAL) {
+                ALOGW("Attempt to set active config = %d for virtual display",
+                        mMode);
+            } else {
+                mFlinger.setActiveConfigInternal(hw, mMode);
+            }
+            return true;
+        }
+    };
+    sp<MessageBase> msg = new MessageSetActiveConfig(*this, display, mode);
+    postMessageSync(msg);
     return NO_ERROR;
 }
 
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 476e549..5ae3d0b 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -239,6 +239,8 @@
 
     // called on the main thread in response to initializeDisplays()
     void onInitializeDisplays();
+    // called on the main thread in response to setActiveConfig()
+    void setActiveConfigInternal(const sp<DisplayDevice>& hw, int mode);
     // called on the main thread in response to setPowerMode()
     void setPowerModeInternal(const sp<DisplayDevice>& hw, int mode);