diff --git a/hwcomposer/hwcomposer_backend.cpp b/hwcomposer/hwcomposer_backend.cpp
index 3b7864a..b46f418 100644
--- a/hwcomposer/hwcomposer_backend.cpp
+++ b/hwcomposer/hwcomposer_backend.cpp
@@ -64,9 +64,8 @@ HwComposerBackend::create()
     // Some implementations insist on having the framebuffer module opened before loading
     // the hardware composer one. Therefor we rely on using the fbdev HYBRIS_EGLPLATFORM
     // here and use eglGetDisplay to initialize it.
-    if (qEnvironmentVariableIsEmpty("QT_QPA_NO_FRAMEBUFFER_FIRST")) {
-           eglGetDisplay(EGL_DEFAULT_DISPLAY);
-    }
+    if (qEnvironmentVariableIsEmpty("QT_QPA_NO_FRAMEBUFFER_FIRST"))
+        eglGetDisplay(EGL_DEFAULT_DISPLAY);

     // Open hardware composer
     HWC_PLUGIN_ASSERT_ZERO(hw_get_module(HWC_HARDWARE_MODULE_ID, (const hw_module_t **)(&hwc_module)));
@@ -133,7 +132,7 @@ HwComposerBackend::create()
 #ifdef HWC_DEVICE_API_VERSION_1_3
         case HWC_DEVICE_API_VERSION_1_3:
             /* Do not use virtual displays */
-            return new HwComposerBackend_v11(hwc_module, hwc_device, HWC_NUM_PHYSICAL_DISPLAY_TYPES);
+            return new HwComposerBackend_v11(hwc_module, hwc_device, HWC_NUM_DISPLAY_TYPES);
             break;
 #endif /* HWC_DEVICE_API_VERSION_1_3 */
 #endif /* HWC_PLUGIN_HAVE_HWCOMPOSER1_API */
diff --git a/hwcomposer/hwcomposer_backend_v11.cpp b/hwcomposer/hwcomposer_backend_v11.cpp
index 6edcb02..45ebdaf 100644
--- a/hwcomposer/hwcomposer_backend_v11.cpp
+++ b/hwcomposer/hwcomposer_backend_v11.cpp
@@ -88,13 +88,32 @@ void HWComposer::present(HWComposerNativeWindowBuffer *buffer)

     setFenceBufferFd(buffer, fblayer->releaseFenceFd);

-    if (oldretire != -1)
-    {
+    if (oldretire != -1) {
         sync_wait(oldretire, -1);
         close(oldretire);
     }
 }

+void hwcv11_proc_invalidate(const struct hwc_procs* procs)
+{
+    fprintf(stderr, "%s: procs=%x\n", __func__, procs);
+}
+
+void hwcv11_proc_vsync(const struct hwc_procs* procs, int disp, int64_t timestamp)
+{
+}
+
+void hwcv11_proc_hotplug(const struct hwc_procs* procs, int disp, int connected)
+{
+    fprintf(stderr, "%s: procs=%x, disp=%d, connected=%d\n", __func__, procs, disp, connected);
+}
+
+static hwc_procs_t global_procs = {
+    hwcv11_proc_invalidate,
+    hwcv11_proc_vsync,
+    hwcv11_proc_hotplug,
+};
+
 HwComposerBackend_v11::HwComposerBackend_v11(hw_module_t *hwc_module, hw_device_t *hw_device, int num_displays)
     : HwComposerBackend(hwc_module)
     , hwc_device((hwc_composer_device_1_t *)hw_device)
@@ -106,6 +125,7 @@ HwComposerBackend_v11::HwComposerBackend_v11(hw_module_t *hwc_module, hw_device_
     , oldrelease2(-1)
     , num_displays(num_displays)
 {
+    hwc_device->registerProcs(hwc_device, &global_procs);
     sleepDisplay(false);

@@ -143,11 +163,13 @@ HwComposerBackend_v11::createWindow(int width, int height)
     HWC_PLUGIN_EXPECT_NULL(hwc_list);
     HWC_PLUGIN_EXPECT_NULL(hwc_mList);

-
     size_t neededsize = sizeof(hwc_display_contents_1_t) + 2 * sizeof(hwc_layer_1_t);
     hwc_list = (hwc_display_contents_1_t *) malloc(neededsize);
     hwc_mList = (hwc_display_contents_1_t **) malloc(num_displays * sizeof(hwc_display_contents_1_t *));
     const hwc_rect_t r = { 0, 0, width, height };
+#ifdef HWC_DEVICE_API_VERSION_1_3
+    const hwc_frect_t rf { 0.0f, 0.0f, width, height };
+#endif

     for (int i = 0; i < num_displays; i++) {
          hwc_mList[i] = hwc_list;
@@ -164,11 +186,17 @@ HwComposerBackend_v11::createWindow(int width, int height)
     layer->transform = 0;
     layer->blending = HWC_BLENDING_NONE;
     layer->sourceCrop = r;
+#ifdef HWC_DEVICE_API_VERSION_1_3
+    layer->sourceCropf = rf;
+#endif
     layer->displayFrame = r;
     layer->visibleRegionScreen.numRects = 1;
     layer->visibleRegionScreen.rects = &layer->displayFrame;
     layer->acquireFenceFd = -1;
     layer->releaseFenceFd = -1;
+#ifdef HWC_DEVICE_API_VERSION_1_2
+    layer->planeAlpha = 0xff;
+#endif

     layer = &hwc_list->hwLayers[1];
     memset(layer, 0, sizeof(hwc_layer_1_t));
@@ -179,11 +207,17 @@ HwComposerBackend_v11::createWindow(int width, int height)
     layer->transform = 0;
     layer->blending = HWC_BLENDING_NONE;
     layer->sourceCrop = r;
+#ifdef HWC_DEVICE_API_VERSION_1_3
+    layer->sourceCropf = rf;
+#endif
     layer->displayFrame = r;
     layer->visibleRegionScreen.numRects = 1;
     layer->visibleRegionScreen.rects = &layer->displayFrame;
     layer->acquireFenceFd = -1;
     layer->releaseFenceFd = -1;
+#ifdef HWC_DEVICE_API_VERSION_1_2
+    layer->planeAlpha = 0xff;
+#endif

     hwc_list->retireFenceFd = -1;
     hwc_list->flags = HWC_GEOMETRY_CHANGED;
@@ -208,7 +242,7 @@ HwComposerBackend_v11::swap(EGLNativeDisplayType display, EGLSurface surface)
     // TODO: Wait for vsync?

     HWC_PLUGIN_ASSERT_NOT_NULL(hwc_win);
-
+
     eglSwapBuffers(display, surface);
 }