diff --git a/m1/patches/rtems/fix-the-vga-vsync-pulses.patch b/m1/patches/rtems/fix-the-vga-vsync-pulses.patch
new file mode 100644
index 0000000..da17f1e
--- /dev/null
+++ b/m1/patches/rtems/fix-the-vga-vsync-pulses.patch
@@ -0,0 +1,43 @@
+Index: rtems/c/src/lib/libbsp/lm32/shared/milkymist_framebuffer/framebuffer.c
+===================================================================
+--- rtems.orig/c/src/lib/libbsp/lm32/shared/milkymist_framebuffer/framebuffer.c	2012-02-23 14:09:03.000000000 +0800
++++ rtems/c/src/lib/libbsp/lm32/shared/milkymist_framebuffer/framebuffer.c	2012-02-23 14:10:29.547648982 +0800
+@@ -98,9 +98,9 @@
+       MM_WRITE(MM_VGA_HSYNC_START, 656);
+       MM_WRITE(MM_VGA_HSYNC_END, 752);
+       MM_WRITE(MM_VGA_HSCAN, 799);
+-      MM_WRITE(MM_VGA_VSYNC_START, 491);
+-      MM_WRITE(MM_VGA_VSYNC_END, 493);
+-      MM_WRITE(MM_VGA_VSCAN, 523);
++      MM_WRITE(MM_VGA_VSYNC_START, 492);
++      MM_WRITE(MM_VGA_VSYNC_END, 494);
++      MM_WRITE(MM_VGA_VSCAN, 524);
+       MM_WRITE(MM_VGA_CLKSEL, 0);
+       break;
+     case 1: // 800x600, pixel clock: 50MHz
+@@ -109,9 +109,9 @@
+       MM_WRITE(MM_VGA_HSYNC_START, 848);
+       MM_WRITE(MM_VGA_HSYNC_END, 976);
+       MM_WRITE(MM_VGA_HSCAN, 1040);
+-      MM_WRITE(MM_VGA_VSYNC_START, 637);
+-      MM_WRITE(MM_VGA_VSYNC_END, 643);
+-      MM_WRITE(MM_VGA_VSCAN, 666);
++      MM_WRITE(MM_VGA_VSYNC_START, 636);
++      MM_WRITE(MM_VGA_VSYNC_END, 642);
++      MM_WRITE(MM_VGA_VSCAN, 665);
+       MM_WRITE(MM_VGA_CLKSEL, 1);
+       break;
+     case 2: // 1024x768, pixel clock: 65MHz
+@@ -120,9 +120,9 @@
+       MM_WRITE(MM_VGA_HSYNC_START, 1048);
+       MM_WRITE(MM_VGA_HSYNC_END, 1184);
+       MM_WRITE(MM_VGA_HSCAN, 1344);
+-      MM_WRITE(MM_VGA_VSYNC_START, 771);
+-      MM_WRITE(MM_VGA_VSYNC_END, 777);
+-      MM_WRITE(MM_VGA_VSCAN, 806);
++      MM_WRITE(MM_VGA_VSYNC_START, 772);
++      MM_WRITE(MM_VGA_VSYNC_END, 778);
++      MM_WRITE(MM_VGA_VSCAN, 807);
+       MM_WRITE(MM_VGA_CLKSEL, 2);
+       break;
+   }
diff --git a/m1/patches/rtems/series b/m1/patches/rtems/series
index d4ccf58..eee60c9 100644
--- a/m1/patches/rtems/series
+++ b/m1/patches/rtems/series
@@ -18,3 +18,4 @@ milkymist-usb-midi.patch
 milkymist-midi-opt.patch	# - applied 2011-12-06
 fix-ftpd-root.patch		# - applied 2012-02-02 796bb3f51cc2a1f7789a3371
 mem-fixes.patch			# - fixed 2012-02-02 
+fix-the-vga-vsync-pulses.patch