diff --git a/src/include/newgal.h b/src/include/newgal.h
index 00c8e255..70d56a16 100644
--- a/src/include/newgal.h
+++ b/src/include/newgal.h
@@ -187,7 +187,7 @@ typedef struct GAL_Surface {
     /* clipping information */
     GAL_Rect clip_rect;                 /* Read-only */
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* update region */
     CLIPRGN update_region;              /* Read-only */
 #endif
@@ -400,11 +400,12 @@ void GAL_UpdateRects
 void GAL_UpdateRect
                 (GAL_Surface *screen, Sint32 x, Sint32 y, Uint32 w, Uint32 h);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
 BLOCKHEAP __mg_free_update_region_list;
-BOOL GAL_SyncUpdate (GAL_Surface *screen);
 #endif
 
+BOOL GAL_SyncUpdate (GAL_Surface *screen);
+
 #if 0
 /*
  * On hardware that supports double-buffering, this function sets up a flip
diff --git a/src/newgal/drm/drmvideo.c b/src/newgal/drm/drmvideo.c
index ce4e66ab..ede2278f 100644
--- a/src/newgal/drm/drmvideo.c
+++ b/src/newgal/drm/drmvideo.c
@@ -1830,7 +1830,7 @@ GAL_Surface* __drm_create_surface_from_name (GHANDLE video,
 
     GAL_SetClipRect(surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
@@ -1929,7 +1929,7 @@ GAL_Surface* __drm_create_surface_from_handle (GHANDLE video,
 
     GAL_SetClipRect(surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
@@ -2028,7 +2028,7 @@ GAL_Surface* __drm_create_surface_from_prime_fd (GHANDLE video,
 
     GAL_SetClipRect(surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
diff --git a/src/newgal/surface-cursor.c b/src/newgal/surface-cursor.c
index 4fd85f84..c8709e69 100644
--- a/src/newgal/surface-cursor.c
+++ b/src/newgal/surface-cursor.c
@@ -107,7 +107,7 @@ GAL_Surface * GAL_CreateCursorSurface (GAL_VideoDevice *video,
     surface->dirty_info = NULL;
     GAL_SetClipRect (surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
diff --git a/src/newgal/surface-shared.c b/src/newgal/surface-shared.c
index 6e94f833..781d3d67 100644
--- a/src/newgal/surface-shared.c
+++ b/src/newgal/surface-shared.c
@@ -141,7 +141,7 @@ GAL_Surface * GAL_CreateSharedRGBSurface (GAL_VideoDevice *video,
     surface->dirty_info = NULL;
     GAL_SetClipRect (surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
@@ -414,7 +414,7 @@ GAL_Surface * GAL_AttachSharedRGBSurface (int fd, size_t map_size,
     surface->format_version = 0;
     GAL_SetClipRect (surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
diff --git a/src/newgal/surface.c b/src/newgal/surface.c
index 316c3507..ec3d3abc 100644
--- a/src/newgal/surface.c
+++ b/src/newgal/surface.c
@@ -144,7 +144,7 @@ GAL_Surface * GAL_CreateRGBSurface (Uint32 flags,
 #endif
     GAL_SetClipRect(surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
@@ -1706,7 +1706,7 @@ void GAL_FreeSurface (GAL_Surface *surface)
         return;
     }
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     EmptyClipRgn (&surface->update_region);
 #endif
 
diff --git a/src/newgal/video.c b/src/newgal/video.c
index 974e7c1e..26022bf2 100644
--- a/src/newgal/video.c
+++ b/src/newgal/video.c
@@ -50,7 +50,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-#define _DEBUG
 #include "common.h"
 #include "minigui.h"
 #include "gal.h"
@@ -165,7 +164,7 @@ static VideoBootStrap *bootstrap[] = {
 
 GAL_VideoDevice *__mg_current_video = NULL;
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
 BLOCKHEAP __mg_free_update_region_list;
 #endif
 
@@ -233,7 +232,7 @@ int GAL_VideoInit (const char *driver_name, Uint32 flags)
     GAL_PixelFormat vformat;
     Uint32 video_flags;
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     InitFreeClipRectList (&__mg_free_update_region_list, SIZE_UPDATERECTHEAP);
 #endif
 
@@ -794,7 +793,7 @@ static void mark_surface_dirty (GAL_Surface* surface,
         di->nr_dirty_rcs = 1;
         di->dirty_rcs[0] = rc_bound;
 
-        _WRN_PRINTF("Too many un-synced dirty rects, merged to one.\n");
+        _DBG_PRINTF("Too many un-synced dirty rects, merged to one.\n");
     }
 
     di->dirty_age++;
@@ -809,9 +808,9 @@ static void mark_surface_dirty (GAL_Surface* surface,
 #include "sharedres.h"
 #include "ourhdr.h"
 #include "drawsemop.h"
-#endif
+#endif /* defined _MGSCHEMA_COMPOSITING */
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
 
 static inline void add_rects_to_update_region (CLIPRGN* region,
         int numrects, GAL_Rect *rects)
@@ -900,6 +899,7 @@ BOOL GAL_SyncUpdate (GAL_Surface *surface)
     GAL_VideoDevice *this = (GAL_VideoDevice *)surface->video;
     GAL_Rect rects[NR_DIRTY_RECTS];
     int numrects;
+    BOOL rc = TRUE;
 
     numrects = __mg_convert_region_to_rects (&surface->update_region,
             rects, NR_DIRTY_RECTS);
@@ -925,13 +925,17 @@ BOOL GAL_SyncUpdate (GAL_Surface *surface)
         else if (this->UpdateSurfaceRects) {
             this->UpdateSurfaceRects (this, surface, numrects, rects);
         }
+
+        if (this->SyncUpdate) {
+            rc = this->SyncUpdate (this);
+        }
     }
 
     EmptyClipRgn (&surface->update_region);
-    return TRUE;
+    return rc;
 }
 
-#else /* defined _MGUSE_SYNC_UPDATE */
+#else /* defined _MGUSE_UPDATE_REGION */
 
 void GAL_UpdateRects (GAL_Surface *surface, int numrects, GAL_Rect *rects)
 {
@@ -956,7 +960,18 @@ void GAL_UpdateRects (GAL_Surface *surface, int numrects, GAL_Rect *rects)
     }
 }
 
-#endif /* not defined _MGUSE_SYNC_UPDATE */
+BOOL GAL_SyncUpdate (GAL_Surface *surface)
+{
+    GAL_VideoDevice *this = (GAL_VideoDevice *)surface->video;
+
+    if (this && this->SyncUpdate) {
+        return this->SyncUpdate (this);
+    }
+
+    return FALSE;
+}
+
+#endif /* not defined _MGUSE_UPDATE_REGION */
 
 static void SetPalette_logical(GAL_Surface *screen, GAL_Color *colors,
         int firstcolor, int ncolors)
@@ -1137,7 +1152,7 @@ void GAL_VideoQuit (void)
         video->free(this);
         __mg_current_video = NULL;
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
         DestroyFreeClipRectList (&__mg_free_update_region_list);
 #endif
     }
@@ -1248,7 +1263,7 @@ static GAL_Surface *Slave_CreateSurface (GAL_VideoDevice *this,
 #endif
     GAL_SetClipRect(surface, NULL);
 
-#ifdef _MGUSE_SYNC_UPDATE
+#ifdef _MGUSE_UPDATE_REGION
     /* Initialize update region */
     InitClipRgn (&surface->update_region, &__mg_free_update_region_list);
 #endif
diff --git a/src/newgdi/gdi.c b/src/newgdi/gdi.c
index 4a759dc6..3835ee4b 100644
--- a/src/newgdi/gdi.c
+++ b/src/newgdi/gdi.c
@@ -2295,11 +2295,9 @@ void GUIAPI ReleaseDC (HDC hDC)
         pdc->alpha_pixel_format = NULL;
     }
 
-#ifdef _MGUSE_SYNC_UPDATE
     LOCK (&__mg_gdilock);
     GAL_SyncUpdate (pdc->surface);
     UNLOCK (&__mg_gdilock);
-#endif
 
     pWin = (PMAINWIN)(pdc->hwnd);
     if (pWin && pWin->privCDC == hDC) {
@@ -3957,7 +3955,6 @@ int GUIAPI SetUserCompositionOps (HDC hdc, CB_COMP_SETPIXEL comp_setpixel,
     return old_rop;
 }
 
-#ifdef _MGUSE_SYNC_UPDATE
 BOOL GUIAPI SyncUpdateDC (HDC hdc)
 {
     BOOL rc;
@@ -3969,12 +3966,12 @@ BOOL GUIAPI SyncUpdateDC (HDC hdc)
 
     return rc;
 }
-#endif
 
-#if defined(_MGUSE_SYNC_UPDATE) && defined(_MGSCHEMA_COMPOSITING)
 BOOL GUIAPI SyncUpdateSurface (HWND hwnd)
 {
     BOOL rc = FALSE;
+
+#ifdef _MGSCHEMA_COMPOSITING
     PMAINWIN main_win = getMainWindowPtr (hwnd);
 
     if (main_win && main_win->surf) {
@@ -3982,10 +3979,14 @@ BOOL GUIAPI SyncUpdateSurface (HWND hwnd)
         rc = GAL_SyncUpdate (main_win->surf);
         UNLOCK (&__mg_gdilock);
     }
+#else
+    LOCK (&__mg_gdilock);
+    rc = GAL_SyncUpdate (__gal_screen);
+    UNLOCK (&__mg_gdilock);
+#endif
 
     return rc;
 }
-#endif
 
 BOOL GUIAPI IsMemDC (HDC hdc)
 {