diff --git a/minui/graphics_drm.cpp b/minui/graphics_drm.cpp
index ef377b7..b8d813e 100644
--- a/minui/graphics_drm.cpp
+++ b/minui/graphics_drm.cpp
@@ -17,78 +17,44 @@
 #include "graphics_drm.h"
 
 #include <fcntl.h>
+#include <poll.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/mman.h>
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <memory>
+
+#include <android-base/macros.h>
+#include <android-base/stringprintf.h>
+#include <android-base/unique_fd.h>
 #include <drm_fourcc.h>
 #include <xf86drm.h>
 #include <xf86drmMode.h>
 
 #include "minui/minui.h"
 
-#define ARRAY_SIZE(A) (sizeof(A)/sizeof(*(A)))
-
-MinuiBackendDrm::MinuiBackendDrm()
-    : GRSurfaceDrms(), main_monitor_crtc(nullptr), main_monitor_connector(nullptr), drm_fd(-1) {}
-
-void MinuiBackendDrm::DrmDisableCrtc(int drm_fd, drmModeCrtc* crtc) {
-  if (crtc) {
-    drmModeSetCrtc(drm_fd, crtc->crtc_id,
-                   0,         // fb_id
-                   0, 0,      // x,y
-                   nullptr,   // connectors
-                   0,         // connector_count
-                   nullptr);  // mode
-  }
-}
-
-void MinuiBackendDrm::DrmEnableCrtc(int drm_fd, drmModeCrtc* crtc, GRSurfaceDrm* surface) {
-  int32_t ret = drmModeSetCrtc(drm_fd, crtc->crtc_id, surface->fb_id, 0, 0,  // x,y
-                               &main_monitor_connector->connector_id,
-                               1,  // connector_count
-                               &main_monitor_crtc->mode);
-
-  if (ret) {
-    printf("drmModeSetCrtc failed ret=%d\n", ret);
-  }
-}
-
-void MinuiBackendDrm::Blank(bool blank) {
-  if (blank) {
-    DrmDisableCrtc(drm_fd, main_monitor_crtc);
-  } else {
-    DrmEnableCrtc(drm_fd, main_monitor_crtc, GRSurfaceDrms[current_buffer]);
-  }
-}
-
-void MinuiBackendDrm::DrmDestroySurface(GRSurfaceDrm* surface) {
-  if (!surface) return;
-
-  if (surface->data) {
-    munmap(surface->data, surface->row_bytes * surface->height);
+GRSurfaceDrm::~GRSurfaceDrm() {
+  if (mmapped_buffer_) {
+    munmap(mmapped_buffer_, row_bytes * height);
   }
 
-  if (surface->fb_id) {
-    int ret = drmModeRmFB(drm_fd, surface->fb_id);
-    if (ret) {
-      printf("drmModeRmFB failed ret=%d\n", ret);
+  if (fb_id) {
+    if (drmModeRmFB(drm_fd_, fb_id) != 0) {
+      perror("Failed to drmModeRmFB");
+      // Falling through to free other resources.
     }
   }
 
-  if (surface->handle) {
+  if (handle) {
     drm_gem_close gem_close = {};
-    gem_close.handle = surface->handle;
+    gem_close.handle = handle;
 
-    int ret = drmIoctl(drm_fd, DRM_IOCTL_GEM_CLOSE, &gem_close);
-    if (ret) {
-      printf("DRM_IOCTL_GEM_CLOSE failed ret=%d\n", ret);
+    if (drmIoctl(drm_fd_, DRM_IOCTL_GEM_CLOSE, &gem_close) != 0) {
+      perror("Failed to DRM_IOCTL_GEM_CLOSE");
     }
   }
-
-  delete surface;
 }
 
 static int drm_format_to_bpp(uint32_t format) {
@@ -108,11 +74,9 @@
   }
 }
 
-GRSurfaceDrm* MinuiBackendDrm::DrmCreateSurface(int width, int height) {
-  GRSurfaceDrm* surface = new GRSurfaceDrm;
-  *surface = {};
-
+std::unique_ptr<GRSurfaceDrm> GRSurfaceDrm::Create(int drm_fd, int width, int height) {
   uint32_t format;
+<<<<<<< HEAD
 #if defined(RECOVERY_ABGR)
   format = DRM_FORMAT_RGBA8888;
 #elif defined(RECOVERY_BGRA)
@@ -124,6 +88,22 @@
 #else
   format = DRM_FORMAT_RGB565;
 #endif
+=======
+  PixelFormat pixel_format = gr_pixel_format();
+  // PixelFormat comes in byte order, whereas DRM_FORMAT_* uses little-endian
+  // (external/libdrm/include/drm/drm_fourcc.h). Note that although drm_fourcc.h also defines a
+  // macro of DRM_FORMAT_BIG_ENDIAN, it doesn't seem to be actually supported (see the discussion
+  // in https://lists.freedesktop.org/archives/amd-gfx/2017-May/008560.html).
+  if (pixel_format == PixelFormat::ABGR) {
+    format = DRM_FORMAT_RGBA8888;
+  } else if (pixel_format == PixelFormat::BGRA) {
+    format = DRM_FORMAT_ARGB8888;
+  } else if (pixel_format == PixelFormat::RGBX) {
+    format = DRM_FORMAT_XBGR8888;
+  } else {
+    format = DRM_FORMAT_RGB565;
+  }
+>>>>>>> android-10.0.0_r25
 
   drm_mode_create_dumb create_dumb = {};
   create_dumb.height = height;
@@ -131,53 +111,74 @@
   create_dumb.bpp = drm_format_to_bpp(format);
   create_dumb.flags = 0;
 
-  int ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb);
-  if (ret) {
-    printf("DRM_IOCTL_MODE_CREATE_DUMB failed ret=%d\n", ret);
-    DrmDestroySurface(surface);
+  if (drmIoctl(drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_dumb) != 0) {
+    perror("Failed to DRM_IOCTL_MODE_CREATE_DUMB");
     return nullptr;
   }
-  surface->handle = create_dumb.handle;
+
+  // Cannot use std::make_unique to access non-public ctor.
+  auto surface = std::unique_ptr<GRSurfaceDrm>(new GRSurfaceDrm(
+      width, height, create_dumb.pitch, create_dumb.bpp / 8, drm_fd, create_dumb.handle));
 
   uint32_t handles[4], pitches[4], offsets[4];
 
   handles[0] = surface->handle;
   pitches[0] = create_dumb.pitch;
   offsets[0] = 0;
-
-  ret =
-      drmModeAddFB2(drm_fd, width, height, format, handles, pitches, offsets, &(surface->fb_id), 0);
-  if (ret) {
-    printf("drmModeAddFB2 failed ret=%d\n", ret);
-    DrmDestroySurface(surface);
+  if (drmModeAddFB2(drm_fd, width, height, format, handles, pitches, offsets, &surface->fb_id, 0) !=
+      0) {
+    perror("Failed to drmModeAddFB2");
     return nullptr;
   }
 
   drm_mode_map_dumb map_dumb = {};
   map_dumb.handle = create_dumb.handle;
-  ret = drmIoctl(drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map_dumb);
-  if (ret) {
-    printf("DRM_IOCTL_MODE_MAP_DUMB failed ret=%d\n", ret);
-    DrmDestroySurface(surface);
+  if (drmIoctl(drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &map_dumb) != 0) {
+    perror("Failed to DRM_IOCTL_MODE_MAP_DUMB");
     return nullptr;
   }
 
-  surface->height = height;
-  surface->width = width;
-  surface->row_bytes = create_dumb.pitch;
-  surface->pixel_bytes = create_dumb.bpp / 8;
-  surface->data = static_cast<unsigned char*>(mmap(nullptr, surface->height * surface->row_bytes,
-                                                   PROT_READ | PROT_WRITE, MAP_SHARED, drm_fd,
-                                                   map_dumb.offset));
-  if (surface->data == MAP_FAILED) {
-    perror("mmap() failed");
-    DrmDestroySurface(surface);
+  auto mmapped = mmap(nullptr, surface->height * surface->row_bytes, PROT_READ | PROT_WRITE,
+                      MAP_SHARED, drm_fd, map_dumb.offset);
+  if (mmapped == MAP_FAILED) {
+    perror("Failed to mmap()");
     return nullptr;
   }
-
+  surface->mmapped_buffer_ = static_cast<uint8_t*>(mmapped);
   return surface;
 }
 
+void MinuiBackendDrm::DrmDisableCrtc(int drm_fd, drmModeCrtc* crtc) {
+  if (crtc) {
+    drmModeSetCrtc(drm_fd, crtc->crtc_id,
+                   0,         // fb_id
+                   0, 0,      // x,y
+                   nullptr,   // connectors
+                   0,         // connector_count
+                   nullptr);  // mode
+  }
+}
+
+bool MinuiBackendDrm::DrmEnableCrtc(int drm_fd, drmModeCrtc* crtc,
+                                    const std::unique_ptr<GRSurfaceDrm>& surface) {
+  if (drmModeSetCrtc(drm_fd, crtc->crtc_id, surface->fb_id, 0, 0,  // x,y
+                     &main_monitor_connector->connector_id,
+                     1,  // connector_count
+                     &main_monitor_crtc->mode) != 0) {
+    perror("Failed to drmModeSetCrtc");
+    return false;
+  }
+  return true;
+}
+
+void MinuiBackendDrm::Blank(bool blank) {
+  if (blank) {
+    DrmDisableCrtc(drm_fd, main_monitor_crtc);
+  } else {
+    DrmEnableCrtc(drm_fd, main_monitor_crtc, GRSurfaceDrms[current_buffer]);
+  }
+}
+
 static drmModeCrtc* find_crtc_for_connector(int fd, drmModeRes* resources,
                                             drmModeConnector* connector) {
   // Find the encoder. If we already have one, just use it.
@@ -259,7 +260,7 @@
   do {
     main_monitor_connector = find_used_connector_by_type(fd, resources, kConnectorPriority[i]);
     i++;
-  } while (!main_monitor_connector && i < ARRAY_SIZE(kConnectorPriority));
+  } while (!main_monitor_connector && i < arraysize(kConnectorPriority));
 
   /* If we didn't find a connector, grab the first one that is connected. */
   if (!main_monitor_connector) {
@@ -293,60 +294,53 @@
 
 GRSurface* MinuiBackendDrm::Init() {
   drmModeRes* res = nullptr;
+  drm_fd = -1;
 
   /* Consider DRM devices in order. */
   for (int i = 0; i < DRM_MAX_MINOR; i++) {
-    char* dev_name;
-    int ret = asprintf(&dev_name, DRM_DEV_NAME, DRM_DIR_NAME, i);
-    if (ret < 0) continue;
+    auto dev_name = android::base::StringPrintf(DRM_DEV_NAME, DRM_DIR_NAME, i);
+    android::base::unique_fd fd(open(dev_name.c_str(), O_RDWR | O_CLOEXEC));
+    if (fd == -1) continue;
 
-    drm_fd = open(dev_name, O_RDWR, 0);
-    free(dev_name);
-    if (drm_fd < 0) continue;
-
-    uint64_t cap = 0;
     /* We need dumb buffers. */
-    ret = drmGetCap(drm_fd, DRM_CAP_DUMB_BUFFER, &cap);
-    if (ret || cap == 0) {
-      close(drm_fd);
+    if (uint64_t cap = 0; drmGetCap(fd.get(), DRM_CAP_DUMB_BUFFER, &cap) != 0 || cap == 0) {
       continue;
     }
 
-    res = drmModeGetResources(drm_fd);
+    res = drmModeGetResources(fd.get());
     if (!res) {
-      close(drm_fd);
       continue;
     }
 
     /* Use this device if it has at least one connected monitor. */
     if (res->count_crtcs > 0 && res->count_connectors > 0) {
-      if (find_first_connected_connector(drm_fd, res)) break;
+      if (find_first_connected_connector(fd.get(), res)) {
+        drm_fd = fd.release();
+        break;
+      }
     }
 
     drmModeFreeResources(res);
-    close(drm_fd);
     res = nullptr;
   }
 
-  if (drm_fd < 0 || res == nullptr) {
-    perror("cannot find/open a drm device");
+  if (drm_fd == -1 || res == nullptr) {
+    perror("Failed to find/open a drm device");
     return nullptr;
   }
 
   uint32_t selected_mode;
   main_monitor_connector = FindMainMonitor(drm_fd, res, &selected_mode);
-
   if (!main_monitor_connector) {
-    printf("main_monitor_connector not found\n");
+    fprintf(stderr, "Failed to find main_monitor_connector\n");
     drmModeFreeResources(res);
     close(drm_fd);
     return nullptr;
   }
 
   main_monitor_crtc = find_crtc_for_connector(drm_fd, res, main_monitor_connector);
-
   if (!main_monitor_crtc) {
-    printf("main_monitor_crtc not found\n");
+    fprintf(stderr, "Failed to find main_monitor_crtc\n");
     drmModeFreeResources(res);
     close(drm_fd);
     return nullptr;
@@ -361,35 +355,66 @@
 
   drmModeFreeResources(res);
 
-  GRSurfaceDrms[0] = DrmCreateSurface(width, height);
-  GRSurfaceDrms[1] = DrmCreateSurface(width, height);
+  GRSurfaceDrms[0] = GRSurfaceDrm::Create(drm_fd, width, height);
+  GRSurfaceDrms[1] = GRSurfaceDrm::Create(drm_fd, width, height);
   if (!GRSurfaceDrms[0] || !GRSurfaceDrms[1]) {
-    // GRSurfaceDrms and drm_fd should be freed in d'tor.
     return nullptr;
   }
 
   current_buffer = 0;
 
-  DrmEnableCrtc(drm_fd, main_monitor_crtc, GRSurfaceDrms[1]);
+  // We will likely encounter errors in the backend functions (i.e. Flip) if EnableCrtc fails.
+  if (!DrmEnableCrtc(drm_fd, main_monitor_crtc, GRSurfaceDrms[1])) {
+    return nullptr;
+  }
 
-  return GRSurfaceDrms[0];
+  return GRSurfaceDrms[0].get();
+}
+
+static void page_flip_complete(__unused int fd,
+                               __unused unsigned int sequence,
+                               __unused unsigned int tv_sec,
+                               __unused unsigned int tv_usec,
+                               void *user_data) {
+  *static_cast<bool*>(user_data) = false;
 }
 
 GRSurface* MinuiBackendDrm::Flip() {
-  int ret = drmModePageFlip(drm_fd, main_monitor_crtc->crtc_id,
-                            GRSurfaceDrms[current_buffer]->fb_id, 0, nullptr);
-  if (ret < 0) {
-    printf("drmModePageFlip failed ret=%d\n", ret);
+  bool ongoing_flip = true;
+  if (drmModePageFlip(drm_fd, main_monitor_crtc->crtc_id, GRSurfaceDrms[current_buffer]->fb_id,
+                      DRM_MODE_PAGE_FLIP_EVENT, &ongoing_flip) != 0) {
+    perror("Failed to drmModePageFlip");
     return nullptr;
   }
+
+  while (ongoing_flip) {
+    struct pollfd fds = {
+      .fd = drm_fd,
+      .events = POLLIN
+    };
+
+    if (poll(&fds, 1, -1) == -1 || !(fds.revents & POLLIN)) {
+      perror("Failed to poll() on drm fd");
+      break;
+    }
+
+    drmEventContext evctx = {
+      .version = DRM_EVENT_CONTEXT_VERSION,
+      .page_flip_handler = page_flip_complete
+    };
+
+    if (drmHandleEvent(drm_fd, &evctx) != 0) {
+      perror("Failed to drmHandleEvent");
+      break;
+    }
+  }
+
   current_buffer = 1 - current_buffer;
-  return GRSurfaceDrms[current_buffer];
+  return GRSurfaceDrms[current_buffer].get();
 }
 
 MinuiBackendDrm::~MinuiBackendDrm() {
   DrmDisableCrtc(drm_fd, main_monitor_crtc);
-  DrmDestroySurface(GRSurfaceDrms[0]);
-  DrmDestroySurface(GRSurfaceDrms[1]);
   drmModeFreeCrtc(main_monitor_crtc);
   drmModeFreeConnector(main_monitor_connector);
   close(drm_fd);