diff --git a/etc/MiniGUI.cfg b/etc/MiniGUI.cfg
index e00ce517..6ccf403c 100644
--- a/etc/MiniGUI.cfg
+++ b/etc/MiniGUI.cfg
@@ -76,6 +76,13 @@ async_update=yes
 # the real engine does not provide WaitWBlank method.
 # Since 5.0.13.
 update_interval=15
+
+# The minimal pixels to use the hardware accelerator.
+# If the number of pixels to copy is less than this value,
+# MiniGUI will use the software copy routine to update the real screen,
+# even if the real device provides a hardware accelerator.
+# Since 5.0.13.
+min_pixels_using_hwaccl=4096
 #}}
 
 #{{ifdef _MGGAL_DRM
@@ -106,6 +113,13 @@ double_buffering=true
 # Since 5.0.13.
 update_interval=15
 
+# The minimal pixels to use the hardware accelerator.
+# If the number of pixels to copy is less than this value,
+# MiniGUI will use the software copy routine to update the real screen,
+# even if the device provides a hardware accelerator.
+# Since 5.0.13.
+min_pixels_using_hwaccl=4096
+
 # The filename of the shared library for the external driver.
 # The equivalent environment variable: MG_GAL_DRM_DRIVER
 exdriver=libdrmdrivers.so
diff --git a/src/newgal/drm/drmvideo.c b/src/newgal/drm/drmvideo.c
index c8cdbd15..e4d1f192 100644
--- a/src/newgal/drm/drmvideo.c
+++ b/src/newgal/drm/drmvideo.c
@@ -1275,6 +1275,14 @@ static GAL_VideoDevice *DRM_CreateDevice(int devindex)
             device->hidden->update_interval = 20;
         }
 
+        if (GetMgEtcIntValue("drm", "min_pixels_using_hwaccl",
+                    &device->hidden->min_pixels_using_hwaccl) < 0) {
+            device->hidden->min_pixels_using_hwaccl = 4096;
+        }
+        else if (device->hidden->min_pixels_using_hwaccl < 0) {
+            device->hidden->min_pixels_using_hwaccl = 4096;
+        }
+
         char tmp [8];
         if (GetMgEtcValue ("drm", "double_buffering", tmp, 8) < 0) {
             device->hidden->dbl_buff = 0;
@@ -2440,9 +2448,11 @@ static void update_real_screen_helper(_THIS)
             RECTW(this->hidden->update_rect),
             RECTH(this->hidden->update_rect) };
 
-        if (vdata->driver_ops->copy_buff(vdata->driver, shadow_buff, &rect,
-            real_buff, &rect, BLIT_COPY_TRANSLATE) == 0) {
-            hw_ok = TRUE;
+        if ((rect.w * rect.h) >= vdata->min_pixels_using_hwaccl) {
+            if (vdata->driver_ops->copy_buff(vdata->driver, shadow_buff, &rect,
+                real_buff, &rect, BLIT_COPY_TRANSLATE) == 0) {
+                hw_ok = TRUE;
+            }
         }
     }
 
diff --git a/src/newgal/drm/drmvideo.h b/src/newgal/drm/drmvideo.h
index 202c4c06..d4cca39d 100644
--- a/src/newgal/drm/drmvideo.h
+++ b/src/newgal/drm/drmvideo.h
@@ -104,7 +104,6 @@ typedef struct GAL_PrivateVideoData {
     uint32_t        cap_vblank_high_crtc:1;
     uint32_t        dbl_buff:1;
     uint32_t        scanout_buff_id;
-    int             update_interval;
     int             crtc_idx;
 
     void*           exdrv_handle;
@@ -117,8 +116,11 @@ typedef struct GAL_PrivateVideoData {
     DrmModeInfo*    saved_info;
     drmModeCrtc*    saved_crtc;
 
+    int             min_pixels_using_hwaccl;
+
     /* async updater */
     int             updater_ready;
+    int             update_interval;
     RECT            update_rect;
     pthread_t       update_thd;
     sem_t           sync_sem;
diff --git a/src/newgal/shadow/shadow.c b/src/newgal/shadow/shadow.c
index 6c6ece69..1d7b3beb 100644
--- a/src/newgal/shadow/shadow.c
+++ b/src/newgal/shadow/shadow.c
@@ -661,15 +661,17 @@ update_helper(_THIS, GAL_VideoDevice *real_device, RECT *update_rect)
     dst_rc.h = RECTH(dirty_rect);
 
     BOOL hw_ok = FALSE;
-    if (real_device->CopyHWSurface) {
-        GAL_Rect src_rc = {
-            update_rect->left, update_rect->top,
-            RECTWP(update_rect), RECTHP(update_rect) };
+    if ((dst_rc.w * dst_rc.h) >= this->hidden->min_pixels_using_hwaccl) {
+        if (real_device->CopyHWSurface) {
+            GAL_Rect src_rc = {
+                update_rect->left, update_rect->top,
+                RECTWP(update_rect), RECTHP(update_rect) };
 
-        if (real_device->CopyHWSurface(real_device,
-                    this->screen, &src_rc,
-                    real_device->screen, &dst_rc, op) == 0) {
-            hw_ok = TRUE;
+            if (real_device->CopyHWSurface(real_device,
+                        this->screen, &src_rc,
+                        real_device->screen, &dst_rc, op) == 0) {
+                hw_ok = TRUE;
+            }
         }
     }
 
@@ -1058,6 +1060,14 @@ static int SHADOW_VideoInit (_THIS, GAL_PixelFormat *vformat)
         }
     }
 
+    if (GetMgEtcIntValue("shadow", "min_pixels_using_hwaccl",
+                &this->hidden->min_pixels_using_hwaccl) < 0) {
+        this->hidden->min_pixels_using_hwaccl = 4096;
+    }
+    else if (this->hidden->min_pixels_using_hwaccl < 0) {
+        this->hidden->min_pixels_using_hwaccl = 4096;
+    }
+
 #if 0   /* code for multiple updaters */
     char nr_updaters[LEN_MODE+1] = "0";
     if (GetMgEtcValue ("shadow", "nr_updaters",
diff --git a/src/newgal/shadow/shadow.h b/src/newgal/shadow/shadow.h
index 61f554e9..a98f7f1b 100644
--- a/src/newgal/shadow/shadow.h
+++ b/src/newgal/shadow/shadow.h
@@ -58,9 +58,6 @@ extern "C" {
 /* Hidden "this" pointer for the video functions */
 #define _THIS    GAL_VideoDevice *this
 
-#define MAX_NR_UPDATERS              6
-#define MIN_PIXELS_USING_UPDATER     4096
-
 typedef struct _ShadowFBHeader {
     unsigned int info_size;
     int width;
@@ -108,6 +105,8 @@ struct GAL_PrivateVideoData {
     int semid;
 #endif
 
+    int             min_pixels_using_hwaccl;
+
     /* async updater */
     int             async_update;
     int             update_interval;