diff --git a/src/drivers/sdl/sdl-opengl.cpp b/src/drivers/sdl/sdl-opengl.cpp
index 53187751..02b38cc1 100644
--- a/src/drivers/sdl/sdl-opengl.cpp
+++ b/src/drivers/sdl/sdl-opengl.cpp
@@ -222,6 +222,14 @@ InitOpenGL(int l,
   InitBlitToHigh(4,0xFF,0xFF00,0xFF0000,efx&2,0,0);
   #endif
  }
+ 
+ if(screen->flags & SDL_FULLSCREEN)
+ {
+  xscale=(double)screen->w / (double)(r-l);
+  yscale=(double)screen->h / (double)(b-t);
+  if(xscale<yscale) yscale = xscale;
+  if(yscale<xscale) xscale = yscale;
+ }
 
  {
   int rw=(int)((r-l)*xscale);
diff --git a/src/drivers/sdl/sdl-video.cpp b/src/drivers/sdl/sdl-video.cpp
index da99f2d5..157f4d01 100644
--- a/src/drivers/sdl/sdl-video.cpp
+++ b/src/drivers/sdl/sdl-video.cpp
@@ -70,6 +70,8 @@ static int s_eefx;
 static int s_clipSides;
 static int s_fullscreen;
 static int noframe;
+static int s_nativeWidth = -1;
+static int s_nativeHeight = -1;
 
 #define NWIDTH	(256 - (s_clipSides ? 16 : 0))
 #define NOFFSET	(s_clipSides ? 8 : 0)
@@ -206,6 +208,14 @@ InitVideo(FCEUGI *gi)
         flags |= SDL_HWSURFACE;
     }
     
+    // get the monitor's current resolution if we do not already have it
+    if(s_nativeWidth < 0) {
+    	s_nativeWidth = vinf->current_w;
+    }
+    if(s_nativeHeight < 0) {
+    	s_nativeHeight = vinf->current_h;
+    }
+    
     // check if we are rendering fullscreen
     if(s_fullscreen) {
         flags |= SDL_FULLSCREEN;
@@ -314,7 +324,9 @@ InitVideo(FCEUGI *gi)
             }
 
 		
-        s_screen = SDL_SetVideoMode(xres, yres, desbpp, flags);
+        s_screen = SDL_SetVideoMode(s_useOpenGL ? s_nativeWidth : xres,
+        							s_useOpenGL ? s_nativeHeight : yres,
+        							desbpp, flags);
         if(!s_screen) {
             FCEUD_PrintError(SDL_GetError());
             return -1;
@@ -359,7 +371,7 @@ InitVideo(FCEUGI *gi)
 		}
 #endif
 
-#ifdef _GTK
+#if defined(_GTK) && defined(SDL_VIDEO_DRIVER_X11)
 		int noGui;
 		g_config->getOption("SDL.NoGUI", &noGui);
 		if(noGui == 0)