diff --git a/configure b/configure
index 7ba4bcb..b858756 100755
--- a/configure
+++ b/configure
@@ -309,7 +309,7 @@
 smartcard_nss=""
 libusb=""
 usb_redir=""
-glx=""
+opengl=""
 zlib="yes"
 lzo=""
 snappy=""
@@ -1027,9 +1027,9 @@
   ;;
   --enable-vhost-scsi) vhost_scsi="yes"
   ;;
-  --disable-glx) glx="no"
+  --disable-opengl) opengl="no"
   ;;
-  --enable-glx) glx="yes"
+  --enable-opengl) opengl="yes"
   ;;
   --disable-rbd) rbd="no"
   ;;
@@ -2085,6 +2085,15 @@
 fi
 
 ##########################################
+# X11 probe
+x11_cflags=
+x11_libs=-lX11
+if $pkg_config --exists "x11"; then
+    x11_cflags=`$pkg_config --cflags x11`
+    x11_libs=`$pkg_config --libs x11`
+fi
+
+##########################################
 # GTK probe
 
 if test "$gtkabi" = ""; then
@@ -2111,7 +2120,8 @@
         gtk_cflags=`$pkg_config --cflags $gtkpackage`
         gtk_libs=`$pkg_config --libs $gtkpackage`
         if $pkg_config --exists "$gtkx11package >= $gtkversion"; then
-            gtk_libs="$gtk_libs -lX11"
+            gtk_cflags="$gtk_cflags $x11_cflags"
+            gtk_libs="$gtk_libs $x11_libs"
         fi
         libs_softmmu="$gtk_libs $libs_softmmu"
         gtk="yes"
@@ -2236,8 +2246,9 @@
 #endif
 int main(void) { return 0; }
 EOF
-  if compile_prog "$sdl_cflags" "$sdl_libs" ; then
-    sdl_libs="$sdl_libs -lX11"
+  if compile_prog "$sdl_cflags $x11_cflags" "$sdl_libs $x11_libs" ; then
+    sdl_cflags="$sdl_cflags $x11_cflags"
+    sdl_libs="$sdl_libs $x11_libs"
   fi
   libs_softmmu="$sdl_libs $libs_softmmu"
 fi
@@ -3107,23 +3118,20 @@
 libs_softmmu="$libs_softmmu $fdt_libs"
 
 ##########################################
-# GLX probe, used by milkymist-tmu2
-if test "$glx" != "no" ; then
-  glx_libs="-lGL -lX11"
-  cat > $TMPC << EOF
-#include <X11/Xlib.h>
-#include <GL/gl.h>
-#include <GL/glx.h>
-int main(void) { glBegin(0); glXQueryVersion(0,0,0); return 0; }
-EOF
-  if compile_prog "" "-lGL -lX11" ; then
-    glx=yes
+# opengl probe (for sdl2, milkymist-tmu2)
+if test "$opengl" != "no" ; then
+  opengl_pkgs="gl glx"
+  if $pkg_config $opengl_pkgs x11; then
+    opengl_cflags="$($pkg_config --cflags $opengl_pkgs) $x11_cflags"
+    opengl_libs="$($pkg_config --libs $opengl_pkgs) $x11_libs"
+    opengl=yes
   else
-    if test "$glx" = "yes" ; then
-      feature_not_found "glx" "Install GL devel (e.g. MESA)"
+    if test "$opengl" = "yes" ; then
+      feature_not_found "opengl" "Install GL devel (e.g. MESA)"
     fi
-    glx_libs=
-    glx=no
+    opengl_cflags=""
+    opengl_libs=""
+    opengl=no
   fi
 fi
 
@@ -4390,7 +4398,7 @@
 echo "nss used          $smartcard_nss"
 echo "libusb            $libusb"
 echo "usb net redir     $usb_redir"
-echo "GLX support       $glx"
+echo "OpenGL support    $opengl"
 echo "libiscsi support  $libiscsi"
 echo "libnfs support    $libnfs"
 echo "build guest agent $guest_agent"
@@ -4756,9 +4764,10 @@
   echo "CONFIG_USB_REDIR=y" >> $config_host_mak
 fi
 
-if test "$glx" = "yes" ; then
-  echo "CONFIG_GLX=y" >> $config_host_mak
-  echo "GLX_LIBS=$glx_libs" >> $config_host_mak
+if test "$opengl" = "yes" ; then
+  echo "CONFIG_OPENGL=y" >> $config_host_mak
+  echo "OPENGL_CFLAGS=$opengl_cflags" >> $config_host_mak
+  echo "OPENGL_LIBS=$opengl_libs" >> $config_host_mak
 fi
 
 if test "$lzo" = "yes" ; then
diff --git a/default-configs/lm32-softmmu.mak b/default-configs/lm32-softmmu.mak
index 7df58c8..4889348 100644
--- a/default-configs/lm32-softmmu.mak
+++ b/default-configs/lm32-softmmu.mak
@@ -2,7 +2,7 @@
 
 CONFIG_LM32=y
 CONFIG_MILKYMIST=y
-CONFIG_MILKYMIST_TMU2=$(CONFIG_GLX)
+CONFIG_MILKYMIST_TMU2=$(CONFIG_OPENGL)
 CONFIG_FRAMEBUFFER=y
 CONFIG_PTIMER=y
 CONFIG_PFLASH_CFI01=y
diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
index 7ed76a9..e73cb7d 100644
--- a/hw/display/Makefile.objs
+++ b/hw/display/Makefile.objs
@@ -20,7 +20,8 @@
 
 ifeq ($(CONFIG_MILKYMIST_TMU2),y)
 common-obj-y += milkymist-tmu2.o
-libs_softmmu += $(GLX_LIBS)
+milkymist-tmu2.o-cflags := $(OPENGL_CFLAGS)
+libs_softmmu += $(OPENGL_LIBS)
 endif
 
 obj-$(CONFIG_OMAP) += omap_dss.o
diff --git a/hw/lm32/milkymist-hw.h b/hw/lm32/milkymist-hw.h
index 5317ce6..8d20cac 100644
--- a/hw/lm32/milkymist-hw.h
+++ b/hw/lm32/milkymist-hw.h
@@ -86,7 +86,7 @@
     return dev;
 }
 
-#ifdef CONFIG_GLX
+#ifdef CONFIG_OPENGL
 #include <X11/Xlib.h>
 #include <GL/glx.h>
 static const int glx_fbconfig_attr[] = {
@@ -100,7 +100,7 @@
 static inline DeviceState *milkymist_tmu2_create(hwaddr base,
         qemu_irq irq)
 {
-#ifdef CONFIG_GLX
+#ifdef CONFIG_OPENGL
     DeviceState *dev;
     Display *d;
     GLXFBConfig *configs;
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 6e85097..8a52934 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -114,6 +114,7 @@
 extern int graphic_height;
 extern int graphic_depth;
 extern DisplayType display_type;
+extern int display_opengl;
 extern const char *keyboard_layout;
 extern int win2k_install_hack;
 extern int alt_grab;
diff --git a/include/ui/qemu-pixman.h b/include/ui/qemu-pixman.h
index 3dee576..5d7a9ac 100644
--- a/include/ui/qemu-pixman.h
+++ b/include/ui/qemu-pixman.h
@@ -27,8 +27,24 @@
 
 #ifdef HOST_WORDS_BIGENDIAN
 # define PIXMAN_BE_r8g8b8     PIXMAN_r8g8b8
+# define PIXMAN_BE_x8r8g8b8   PIXMAN_x8r8g8b8
+# define PIXMAN_BE_a8r8g8b8   PIXMAN_a8r8g8b8
+# define PIXMAN_BE_b8g8r8x8   PIXMAN_b8g8r8x8
+# define PIXMAN_BE_b8g8r8a8   PIXMAN_b8g8r8a8
+# define PIXMAN_BE_r8g8b8x8   PIXMAN_r8g8b8x8
+# define PIXMAN_BE_r8g8b8a8   PIXMAN_r8g8b8a8
+# define PIXMAN_BE_x8b8g8r8   PIXMAN_x8b8g8r8
+# define PIXMAN_BE_a8b8g8r8   PIXMAN_a8b8g8r8
 #else
 # define PIXMAN_BE_r8g8b8     PIXMAN_b8g8r8
+# define PIXMAN_BE_x8r8g8b8   PIXMAN_b8g8r8x8
+# define PIXMAN_BE_a8r8g8b8   PIXMAN_b8g8r8a8
+# define PIXMAN_BE_b8g8r8x8   PIXMAN_x8r8g8b8
+# define PIXMAN_BE_b8g8r8a8   PIXMAN_a8r8g8b8
+# define PIXMAN_BE_r8g8b8x8   PIXMAN_x8b8g8r8
+# define PIXMAN_BE_r8g8b8a8   PIXMAN_a8b8g8r8
+# define PIXMAN_BE_x8b8g8r8   PIXMAN_r8g8b8x8
+# define PIXMAN_BE_a8b8g8r8   PIXMAN_r8g8b8a8
 #endif
 
 /* -------------------------------------------------------------------- */
diff --git a/ui/sdl.c b/ui/sdl.c
index 138ca73..8bdbf52 100644
--- a/ui/sdl.c
+++ b/ui/sdl.c
@@ -61,16 +61,24 @@
 static int scaling_active = 0;
 static Notifier mouse_mode_notifier;
 
+#if 0
+#define DEBUG_SDL
+#endif
+
 static void sdl_update(DisplayChangeListener *dcl,
                        int x, int y, int w, int h)
 {
-    //    printf("updating x=%d y=%d w=%d h=%d\n", x, y, w, h);
     SDL_Rect rec;
     rec.x = x;
     rec.y = y;
     rec.w = w;
     rec.h = h;
 
+#ifdef DEBUG_SDL
+    printf("SDL: Updating x=%d y=%d w=%d h=%d (scaling: %d)\n",
+           x, y, w, h, scaling_active);
+#endif
+
     if (guest_screen) {
         if (!scaling_active) {
             SDL_BlitSurface(guest_screen, &rec, real_screen, &rec);
@@ -89,7 +97,9 @@
     int flags;
     SDL_Surface *tmp_screen;
 
-    //    printf("resizing to %d %d\n", w, h);
+#ifdef DEBUG_SDL
+    printf("SDL: Resizing to %dx%d bpp %d\n", width, height, bpp);
+#endif
 
     flags = SDL_HWSURFACE | SDL_ASYNCBLIT | SDL_HWACCEL;
     if (gui_fullscreen) {
@@ -125,12 +135,13 @@
 static void sdl_switch(DisplayChangeListener *dcl,
                        DisplaySurface *new_surface)
 {
-    PixelFormat pf = qemu_pixelformat_from_pixman(new_surface->format);
+    PixelFormat pf;
 
     /* temporary hack: allows to call sdl_switch to handle scaling changes */
     if (new_surface) {
         surface = new_surface;
     }
+    pf = qemu_pixelformat_from_pixman(surface->format);
 
     if (!scaling_active) {
         do_sdl_resize(surface_width(surface), surface_height(surface), 0);
@@ -143,6 +154,12 @@
     if (guest_screen != NULL) {
         SDL_FreeSurface(guest_screen);
     }
+
+#ifdef DEBUG_SDL
+    printf("SDL: Creating surface with masks: %08x %08x %08x %08x\n",
+           pf.rmask, pf.gmask, pf.bmask, pf.amask);
+#endif
+
     guest_screen = SDL_CreateRGBSurfaceFrom
         (surface_data(surface),
          surface_width(surface), surface_height(surface),
@@ -486,6 +503,10 @@
 {
     int bpp = real_screen->format->BitsPerPixel;
 
+#ifdef DEBUG_SDL
+    printf("SDL: Scaling to %dx%d bpp %d\n", width, height, bpp);
+#endif
+
     if (bpp != 16 && bpp != 32) {
         bpp = 32;
     }
diff --git a/vl.c b/vl.c
index eba5d4c..694deb4 100644
--- a/vl.c
+++ b/vl.c
@@ -130,6 +130,7 @@
 const char *bios_name = NULL;
 enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
 DisplayType display_type = DT_DEFAULT;
+int display_opengl;
 static int display_remote;
 const char* keyboard_layout = NULL;
 ram_addr_t ram_size;