diff --git a/include/gui/ISurfaceComposer.h b/include/gui/ISurfaceComposer.h
index 6f4be09..de1d65d 100644
--- a/include/gui/ISurfaceComposer.h
+++ b/include/gui/ISurfaceComposer.h
@@ -34,6 +34,7 @@
 // ----------------------------------------------------------------------------
 
 class ComposerState;
+class DisplayState;
 class IDisplayEventConnection;
 class IMemoryHeap;
 
@@ -104,8 +105,10 @@
     virtual sp<IMemoryHeap> getCblk() const = 0;
 
     /* open/close transactions. requires ACCESS_SURFACE_FLINGER permission */
-    virtual void setTransactionState(const Vector<ComposerState>& state,
-            int orientation, uint32_t flags) = 0;
+    virtual void setTransactionState(
+            const Vector<ComposerState>& state,
+            const Vector<DisplayState>& displays,
+            uint32_t flags) = 0;
 
     /* signal that we're done booting.
      * Requires ACCESS_SURFACE_FLINGER permission
diff --git a/include/private/gui/LayerState.h b/include/private/gui/LayerState.h
index 239dd87..97891e4 100644
--- a/include/private/gui/LayerState.h
+++ b/include/private/gui/LayerState.h
@@ -77,6 +77,17 @@
     status_t    read(const Parcel& input);
 };
 
+struct DisplayState {
+    int32_t             displayId;
+    sp<ISurfaceTexture> surface;
+    uint32_t            layerStack;
+    uint32_t            orientation;
+    Rect                viewport;
+    Rect                frame;
+    status_t    write(Parcel& output) const;
+    status_t    read(const Parcel& input);
+};
+
 }; // namespace android
 
 #endif // ANDROID_SF_LAYER_STATE_H
diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index bc550bf..60341ff 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -76,18 +76,29 @@
         return interface_cast<IMemoryHeap>(reply.readStrongBinder());
     }
 
-    virtual void setTransactionState(const Vector<ComposerState>& state,
-            int orientation, uint32_t flags)
+    virtual void setTransactionState(
+            const Vector<ComposerState>& state,
+            const Vector<DisplayState>& displays,
+            uint32_t flags)
     {
         Parcel data, reply;
         data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
-        Vector<ComposerState>::const_iterator b(state.begin());
-        Vector<ComposerState>::const_iterator e(state.end());
-        data.writeInt32(state.size());
-        for ( ; b != e ; ++b ) {
-            b->write(data);
+        {
+            Vector<ComposerState>::const_iterator b(state.begin());
+            Vector<ComposerState>::const_iterator e(state.end());
+            data.writeInt32(state.size());
+            for ( ; b != e ; ++b ) {
+                b->write(data);
+            }
         }
-        data.writeInt32(orientation);
+        {
+            Vector<DisplayState>::const_iterator b(displays.begin());
+            Vector<DisplayState>::const_iterator e(displays.end());
+            data.writeInt32(displays.size());
+            for ( ; b != e ; ++b ) {
+                b->write(data);
+            }
+        }
         data.writeInt32(flags);
         remote()->transact(BnSurfaceComposer::SET_TRANSACTION_STATE, data, &reply);
     }
@@ -244,9 +255,16 @@
                 s.read(data);
                 state.add(s);
             }
-            int orientation = data.readInt32();
+            count = data.readInt32();
+            DisplayState d;
+            Vector<DisplayState> displays;
+            displays.setCapacity(count);
+            for (size_t i=0 ; i<count ; i++) {
+                d.read(data);
+                displays.add(d);
+            }
             uint32_t flags = data.readInt32();
-            setTransactionState(state, orientation, flags);
+            setTransactionState(state, displays, flags);
         } break;
         case BOOT_FINISHED: {
             CHECK_INTERFACE(ISurfaceComposer, data, reply);
diff --git a/libs/gui/LayerState.cpp b/libs/gui/LayerState.cpp
index 224c305..25c773c 100644
--- a/libs/gui/LayerState.cpp
+++ b/libs/gui/LayerState.cpp
@@ -17,6 +17,7 @@
 #include <utils/Errors.h>
 #include <binder/Parcel.h>
 #include <gui/ISurfaceComposerClient.h>
+#include <gui/ISurfaceTexture.h>
 #include <private/gui/LayerState.h>
 
 namespace android {
@@ -69,4 +70,26 @@
     return state.read(input);
 }
 
+
+status_t DisplayState::write(Parcel& output) const {
+    output.writeStrongBinder(surface->asBinder());
+    output.writeInt32(displayId);
+    output.writeInt32(layerStack);
+    output.writeInt32(orientation);
+    memcpy(output.writeInplace(sizeof(Rect)), &viewport, sizeof(Rect));
+    memcpy(output.writeInplace(sizeof(Rect)), &frame, sizeof(Rect));
+    return NO_ERROR;
+}
+
+status_t DisplayState::read(const Parcel& input) {
+    surface = interface_cast<ISurfaceTexture>(input.readStrongBinder());
+    displayId = input.readInt32();
+    layerStack = input.readInt32();
+    orientation = input.readInt32();
+    memcpy(&viewport, input.readInplace(sizeof(Rect)), sizeof(Rect));
+    memcpy(&frame,    input.readInplace(sizeof(Rect)), sizeof(Rect));
+    return NO_ERROR;
+}
+
+
 }; // namespace android
diff --git a/libs/gui/SurfaceComposerClient.cpp b/libs/gui/SurfaceComposerClient.cpp
index b1bd78b..8aa0c55 100644
--- a/libs/gui/SurfaceComposerClient.cpp
+++ b/libs/gui/SurfaceComposerClient.cpp
@@ -138,7 +138,7 @@
     sp<ISurfaceComposer> sm(getComposerService());
 
     Vector<ComposerState> transaction;
-    int orientation;
+    Vector<DisplayState> displayTransaction;
     uint32_t flags = 0;
 
     { // scope for the lock
@@ -146,7 +146,11 @@
         transaction = mStates;
         mStates.clear();
 
-        orientation = mOrientation;
+        // FIXME: this should be the displays transaction state here
+        DisplayState item;
+        item.orientation = mOrientation;
+        displayTransaction.add(item);
+
         mOrientation = ISurfaceComposer::eOrientationUnchanged;
 
         if (synchronous || mForceSynchronous) {
@@ -155,7 +159,7 @@
         mForceSynchronous = false;
     }
 
-   sm->setTransactionState(transaction, orientation, flags);
+   sm->setTransactionState(transaction, displayTransaction, flags);
 }
 
 layer_state_t* Composer::getLayerStateLocked(
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index ad3865e..8da2543 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -143,7 +143,11 @@
 
     // reset screen orientation
     Vector<ComposerState> state;
-    setTransactionState(state, eOrientationDefault, 0);
+    Vector<DisplayState> displays;
+    DisplayState d;
+    d.orientation = eOrientationDefault;
+    displays.add(d);
+    setTransactionState(state, displays, 0);
 
     // restart the boot-animation
     startBootAnim();
@@ -1325,10 +1329,19 @@
 }
 
 
-void SurfaceFlinger::setTransactionState(const Vector<ComposerState>& state,
-        int orientation, uint32_t flags) {
+void SurfaceFlinger::setTransactionState(
+        const Vector<ComposerState>& state,
+        const Vector<DisplayState>& displays,
+        uint32_t flags)
+{
     Mutex::Autolock _l(mStateLock);
 
+    int orientation = eOrientationUnchanged;
+    if (displays.size()) {
+        // TODO: handle all displays
+        orientation = displays[0].orientation;
+    }
+
     uint32_t transactionFlags = 0;
     if (mCurrentState.orientation != orientation) {
         if (uint32_t(orientation)<=eOrientation270 || orientation==42) {
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 569fe35..3ecaa7f 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -165,7 +165,7 @@
     virtual sp<IMemoryHeap> getCblk() const;
     virtual void bootFinished();
     virtual void setTransactionState(const Vector<ComposerState>& state,
-        int orientation, uint32_t flags);
+            const Vector<DisplayState>& displays, uint32_t flags);
     virtual bool authenticateSurfaceTexture(
         const sp<ISurfaceTexture>& surface) const;
     virtual sp<IDisplayEventConnection> createDisplayEventConnection();