diff -ur ioquake3-orig/code/sdl/sdl_glimp.c ioquake3/code/sdl/sdl_glimp.c
--- ioquake3-orig/code/sdl/sdl_glimp.c	2012-01-10 19:52:16.920254556 +0000
+++ ioquake3/code/sdl/sdl_glimp.c	2012-01-10 19:56:16.685249315 +0000
@@ -250,7 +250,15 @@
 
 	ri.Printf (PRINT_ALL, "...setting mode %d:", mode );
 
-	if ( !R_GetModeInfo( &glConfig.vidWidth, &glConfig.vidHeight, &glConfig.windowAspect, mode ) )
+	if (mode == -2)
+	{
+		glConfig.vidWidth = videoInfo->current_w;
+		glConfig.vidHeight = videoInfo->current_h;
+		glConfig.windowAspect = displayAspect;
+		fullscreen = qtrue;
+		noborder = qtrue;
+	}
+	else if ( !R_GetModeInfo( &glConfig.vidWidth, &glConfig.vidHeight, &glConfig.windowAspect, mode ) )
 	{
 		ri.Printf( PRINT_ALL, " invalid mode\n" );
 		return RSERR_INVALID_MODE;
@@ -475,6 +483,14 @@
 		fullscreen = qfalse;
 	}
 	
+	if (!fullscreen && mode == -2)
+	{
+		ri.Printf( PRINT_ALL, "Windowed not allowed with r_mode -2\n");
+		ri.Cvar_Set( "r_fullscreen", "1" );
+		r_fullscreen->modified = qfalse;
+		fullscreen = qtrue;
+	}
+
 	err = GLimp_SetMode(mode, fullscreen, noborder);
 
 	switch ( err )