diff --git a/composer/display_null.cpp b/composer/display_null.cpp
index e0697d5cd..4a7e205f0 100644
--- a/composer/display_null.cpp
+++ b/composer/display_null.cpp
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
+* Copyright (c) 2017-2021, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -118,7 +118,9 @@ DisplayError DisplayNull::Prepare(LayerStack *layer_stack) {
   }
 
   for (auto layer : layer_stack->layers) {
-    layer->composition = kCompositionGPU;
+    if (layer->composition != kCompositionGPUTarget) {
+      layer->composition = kCompositionGPU;
+    }
   }
   return kErrorNone;
 }
diff --git a/composer/display_null.h b/composer/display_null.h
index ba2cfb4ec..34a44ae7b 100644
--- a/composer/display_null.h
+++ b/composer/display_null.h
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2017-2019, The Linux Foundation. All rights reserved.
+* Copyright (c) 2017-2019, 2021, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -123,6 +123,12 @@ class DisplayNull : public DisplayInterface {
   MAKE_NO_OP(SetDisplayElapseTime(uint64_t))
   MAKE_NO_OP(ClearLUTs())
 
+  void SetActive(bool active) { active_ = active; }
+  bool IsActive() { return active_; }
+
+ private:
+  bool active_ = false;
+
  protected:
   DisplayConfigVariableInfo default_variable_config_ = {};
   DisplayConfigFixedInfo default_fixed_config_ = {};
@@ -150,11 +156,7 @@ class DisplayNullExternal : public DisplayNull {
   virtual DisplayError GetFrameBufferConfig(DisplayConfigVariableInfo *variable_info);
   virtual DisplayError GetDisplayIdentificationData(uint8_t *out_port, uint32_t *out_data_size,
                                                     uint8_t *out_data);
-  void SetActive(bool active) { active_ = active; }
-  bool IsActive() { return active_; }
-
  private:
-  bool active_ = false;
   DisplayState state_ = kStateOff;
   DisplayConfigVariableInfo fb_config_ = {};
 };
diff --git a/composer/hwc_display.h b/composer/hwc_display.h
index a758b25fa..cebbc8d64 100644
--- a/composer/hwc_display.h
+++ b/composer/hwc_display.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright 2015 The Android Open Source Project
@@ -248,6 +248,9 @@ class HWCDisplay : public DisplayEventHandler {
   virtual int SetState(bool connected) {
     return kErrorNotSupported;
   }
+  virtual DisplayError SetStandByMode(bool enable) {
+    return kErrorNotSupported;
+  }
   virtual DisplayError Flush() {
     return kErrorNotSupported;
   }
diff --git a/composer/hwc_display_builtin.cpp b/composer/hwc_display_builtin.cpp
index 69395da6c..22f6f275d 100644
--- a/composer/hwc_display_builtin.cpp
+++ b/composer/hwc_display_builtin.cpp
@@ -1239,6 +1239,29 @@ DisplayError HWCDisplayBuiltIn::GetSupportedDSIClock(std::vector<uint64_t> *bitc
   return kErrorNotSupported;
 }
 
+DisplayError HWCDisplayBuiltIn::SetStandByMode(bool enable) {
+  if (enable) {
+    if (!display_null_.IsActive()) {
+      stored_display_intf_ = display_intf_;
+      display_intf_ = &display_null_;
+      display_null_.SetActive(true);
+      DLOGD("Null display is connected successfully");
+    } else {
+      DLOGD("Null display is already connected.");
+    }
+  } else {
+    if (display_null_.IsActive()) {
+      display_intf_ = stored_display_intf_;
+      validated_ = false;
+      display_null_.SetActive(false);
+      DLOGD("Display is connected successfully");
+    } else {
+      DLOGD("Display is already connected.");
+    }
+  }
+  return kErrorNone;
+}
+
 HWC2::Error HWCDisplayBuiltIn::UpdateDisplayId(hwc2_display_t id) {
   id_ = id;
   return HWC2::Error::None;
diff --git a/composer/hwc_display_builtin.h b/composer/hwc_display_builtin.h
index 8629c2488..aab416fdc 100644
--- a/composer/hwc_display_builtin.h
+++ b/composer/hwc_display_builtin.h
@@ -40,6 +40,7 @@
 #include "cpuhint.h"
 #include "hwc_display.h"
 #include "hwc_layers.h"
+#include "display_null.h"
 
 #include "gl_layer_stitch.h"
 
@@ -112,6 +113,7 @@ class HWCDisplayBuiltIn : public HWCDisplay, public SyncTask<LayerStitchTaskCode
   virtual DisplayError SetDynamicDSIClock(uint64_t bitclk);
   virtual DisplayError GetDynamicDSIClock(uint64_t *bitclk);
   virtual DisplayError GetSupportedDSIClock(std::vector<uint64_t> *bitclk_rates);
+  virtual DisplayError SetStandByMode(bool enable);
   virtual HWC2::Error UpdateDisplayId(hwc2_display_t id);
   virtual HWC2::Error SetPendingRefresh();
   virtual HWC2::Error SetPanelBrightness(float brightness);
@@ -233,6 +235,10 @@ class HWCDisplayBuiltIn : public HWCDisplay, public SyncTask<LayerStitchTaskCode
   bool disable_dyn_fps_ = false;
   bool enhance_idle_time_ = false;
   bool force_reset_validate_ = false;
+
+  // NULL display
+  DisplayNull display_null_;
+  DisplayInterface *stored_display_intf_ = NULL;
 };
 
 }  // namespace sdm
diff --git a/composer/hwc_session.cpp b/composer/hwc_session.cpp
index ea864cb9a..20c16cecc 100644
--- a/composer/hwc_session.cpp
+++ b/composer/hwc_session.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright 2015 The Android Open Source Project
@@ -1697,6 +1697,14 @@ android::status_t HWCSession::notifyCallback(uint32_t command, const android::Pa
       status = SetDisplayBrightnessScale(input_parcel);
       break;
 
+    case qService::IQService::SET_STAND_BY_MODE:
+      if (!input_parcel) {
+        DLOGE("QService command = %d: input_parcel needed.", command);
+        break;
+      }
+      status = SetStandByMode(input_parcel);
+      break;
+
     default:
       DLOGW("QService command = %d is not supported.", command);
       break;
@@ -2501,6 +2509,21 @@ android::status_t HWCSession::GetVisibleDisplayRect(const android::Parcel *input
   return android::NO_ERROR;
 }
 
+android::status_t HWCSession::SetStandByMode(const android::Parcel *input_parcel) {
+  SCOPE_LOCK(locker_[HWC_DISPLAY_PRIMARY]);
+
+  bool enable = (input_parcel->readInt32() > 0);
+
+  if (!hwc_display_[HWC_DISPLAY_PRIMARY]) {
+    DLOGI("Primary display is not initialized");
+    return -EINVAL;
+  }
+
+  hwc_display_[HWC_DISPLAY_PRIMARY]->SetStandByMode(enable);
+
+  return android::NO_ERROR;
+}
+
 int HWCSession::CreatePrimaryDisplay() {
   int status = -EINVAL;
   HWDisplaysInfo hw_displays_info = {};
diff --git a/composer/hwc_session.h b/composer/hwc_session.h
index 5044e5d91..1314a12fe 100644
--- a/composer/hwc_session.h
+++ b/composer/hwc_session.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014-2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2014-2021, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright 2015 The Android Open Source Project
@@ -478,6 +478,7 @@ class HWCSession : hwc2_device_t, HWCUEventListener, public qClient::BnQClient,
   android::status_t SetColorModeById(const android::Parcel *input_parcel);
   android::status_t SetColorModeFromClient(const android::Parcel *input_parcel);
   android::status_t getComposerStatus();
+  android::status_t SetStandByMode(const android::Parcel *input_parcel);
   android::status_t SetQSyncMode(const android::Parcel *input_parcel);
   android::status_t SetIdlePC(const android::Parcel *input_parcel);
   android::status_t RefreshScreen(const android::Parcel *input_parcel);
diff --git a/libqdutils/display_config.cpp b/libqdutils/display_config.cpp
index 8f27200d6..0157a536c 100644
--- a/libqdutils/display_config.cpp
+++ b/libqdutils/display_config.cpp
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2014, 2016, 2018-2020, The Linux Foundation. All rights reserved.
+* Copyright (c) 2013-2014, 2016, 2018-2021, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -393,3 +393,19 @@ extern "C" int waitForComposerInit() {
 
     return !status;
 }
+
+extern "C" int setStandByMode(int mode) {
+    status_t err = (status_t) FAILED_TRANSACTION;
+    sp<IQService> binder = getBinder();
+    Parcel inParcel, outParcel;
+
+    if(binder != NULL) {
+        inParcel.writeInt32(mode);
+        err = binder->dispatch(IQService::SET_STAND_BY_MODE,
+              &inParcel, &outParcel);
+        if(err) {
+            ALOGE("%s() failed with err %d", __FUNCTION__, err);
+        }
+    }
+    return err;
+}
diff --git a/libqdutils/display_config.h b/libqdutils/display_config.h
index 21aea6068..81f22d751 100644
--- a/libqdutils/display_config.h
+++ b/libqdutils/display_config.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 - 2016, 2018 - 2020, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2013 - 2016, 2018 - 2021, The Linux Foundation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
@@ -170,6 +170,9 @@ int getSupportedBitClk(int dpy, std::vector<uint64_t>& bit_rates);
 // Sets the specified min and max luminance values.
 int setPanelLuminanceAttributes(int dpy, float min_lum, float max_lum);
 
+// Sets display standy mode
+extern "C" int setStandByMode(int mode);
+
 }; //namespace
 
 
diff --git a/libqservice/IQService.h b/libqservice/IQService.h
index 920f27c54..473de12bf 100644
--- a/libqservice/IQService.h
+++ b/libqservice/IQService.h
@@ -1,6 +1,6 @@
 /*
  * Copyright (C) 2010 The Android Open Source Project
- * Copyright (C) 2012-2014, 2016-2019 The Linux Foundation. All rights reserved.
+ * Copyright (C) 2012-2014, 2016-2019, 2021, The Linux Foundation. All rights reserved.
  *
  * Not a Contribution, Apache license notifications and license are
  * retained for attribution purposes only.
@@ -79,6 +79,7 @@ class IQService : public android::IInterface
       SET_PANEL_LUMINANCE = 47,                // Set Panel Luminance attributes.
       SET_BRIGHTNESS_SCALE = 48,               // Set brightness scale ratio
       SET_COLOR_SAMPLING_ENABLED = 49,         // Toggle the collection of display color stats
+      SET_STAND_BY_MODE = 50,                  // Set stand by mode for MDP hardware
       COMMAND_LIST_END = 400,
     };