diff --git a/common/xrdp_client_info.h b/common/xrdp_client_info.h
index ca349f0a..297cdc55 100644
--- a/common/xrdp_client_info.h
+++ b/common/xrdp_client_info.h
@@ -156,6 +156,7 @@ struct xrdp_client_info
   int no_orders_supported;
   int use_cache_glyph_v2;
   int rail_enable;
+  int suppress_output;
 };
 
 #endif
diff --git a/libxrdp/xrdp_caps.c b/libxrdp/xrdp_caps.c
index 4d1ab45f..1c0587f5 100644
--- a/libxrdp/xrdp_caps.c
+++ b/libxrdp/xrdp_caps.c
@@ -810,7 +810,8 @@ xrdp_caps_send_demand_active(struct xrdp_rdp *self)
     out_uint16_le(s, 0); /* Update capability */
     out_uint16_le(s, 0); /* Remote unshare capability */
     out_uint16_le(s, 0); /* Compression level */
-    out_uint16_le(s, 0); /* Pad */
+    out_uint8(s, 1); /* refreshRectSupport */
+    out_uint8(s, 1); /* suppressOutputSupport */
 
     /* Output bitmap capability set */
     caps_count++;
diff --git a/libxrdp/xrdp_rdp.c b/libxrdp/xrdp_rdp.c
index e4ee660f..319bac23 100644
--- a/libxrdp/xrdp_rdp.c
+++ b/libxrdp/xrdp_rdp.c
@@ -1209,21 +1209,91 @@ xrdp_rdp_process_frame_ack(struct xrdp_rdp *self, struct stream *s)
     return 0;
 }
 
+/*****************************************************************************/
+static int
+xrdp_rdp_process_suppress(struct xrdp_rdp *self, struct stream *s)
+{
+    int allowDisplayUpdates;
+    int left;
+    int top;
+    int right;
+    int bottom;
+
+    if (!s_check_rem(s, 1))
+    {
+        return 1;
+    }
+    in_uint8(s, allowDisplayUpdates);
+    g_writeln("xrdp_rdp_process_suppress: allowDisplayUpdates %d bytes "
+              "left %d", allowDisplayUpdates, (int) (s->end - s->p));
+    switch (allowDisplayUpdates)
+    {
+        case 0: /* SUPPRESS_DISPLAY_UPDATES */
+            self->client_info.suppress_output = 1;
+            g_writeln("xrdp_rdp_process_suppress: suppress_output %d",
+                      self->client_info.suppress_output);
+            if (self->session->callback != 0)
+            {
+                self->session->callback(self->session->id, 0x5559, 1,
+                                        0, 0, 0);
+            }
+            break;
+        case 1: /* ALLOW_DISPLAY_UPDATES */
+            self->client_info.suppress_output = 0;
+            if (!s_check_rem(s, 11))
+            {
+                return 1;
+            }
+            in_uint8s(s, 3); /* pad */
+            in_uint16_le(s, left);
+            in_uint16_le(s, top);
+            in_uint16_le(s, right);
+            in_uint16_le(s, bottom);
+            g_writeln("xrdp_rdp_process_suppress: suppress_output %d "
+                      "left %d top %d right %d bottom %d",
+                      self->client_info.suppress_output,
+                      left, top, right, bottom);
+            if (self->session->callback != 0)
+            {
+                self->session->callback(self->session->id, 0x5559, 0,
+                                        MAKELONG(left, top),
+                                        MAKELONG(right, bottom), 0);
+            }
+            break;
+    }
+    return 0;
+}
+
 /*****************************************************************************/
 /* RDP_PDU_DATA */
 int
 xrdp_rdp_process_data(struct xrdp_rdp *self, struct stream *s)
 {
-    int data_type;
+    int uncompressedLength;
+    int pduType2;
+    int compressedType;
+    int compressedLength;
 
+    if (!s_check_rem(s, 12))
+    {
+        return 1;
+    }
     in_uint8s(s, 6);
-    in_uint8s(s, 2); /* len */
-    in_uint8(s, data_type);
-    in_uint8s(s, 1); /* ctype */
-    in_uint8s(s, 2); /* clen */
-    DEBUG(("xrdp_rdp_process_data code %d", data_type));
-
-    switch (data_type)
+    in_uint16_le(s, uncompressedLength);
+    in_uint8(s, pduType2);
+    in_uint8(s, compressedType);
+    in_uint16_le(s, compressedLength);
+    if (compressedType != 0)
+    {
+        /* don't support compression */
+        return 1;
+    }
+    if (compressedLength > uncompressedLength)
+    {
+        return 1;
+    }
+    DEBUG(("xrdp_rdp_process_data pduType2 %d", pduType2));
+    switch (pduType2)
     {
         case RDP_DATA_PDU_POINTER: /* 27(0x1b) */
             xrdp_rdp_process_data_pointer(self, s);
@@ -1240,11 +1310,8 @@ xrdp_rdp_process_data(struct xrdp_rdp *self, struct stream *s)
         case 33: /* 33(0x21) ?? Invalidate an area I think */
             xrdp_rdp_process_screen_update(self, s);
             break;
-        case 35: /* 35(0x23) */
-            /* 35 ?? this comes when minimizing a full screen mstsc.exe 2600 */
-            /* I think this is saying the client no longer wants screen */
-            /* updates and it will issue a 33 above to catch up */
-            /* so minimized apps don't take bandwidth */
+        case 35: /* 35(0x23) PDUTYPE2_SUPPRESS_OUTPUT */
+            xrdp_rdp_process_suppress(self, s);
             break;
         case 36: /* 36(0x24) ?? disconnect query? */
             /* when this message comes, send a 37 back so the client */
@@ -1259,10 +1326,9 @@ xrdp_rdp_process_data(struct xrdp_rdp *self, struct stream *s)
             xrdp_rdp_process_frame_ack(self, s);
             break;
         default:
-            g_writeln("unknown in xrdp_rdp_process_data %d", data_type);
+            g_writeln("unknown in xrdp_rdp_process_data pduType2 %d", pduType2);
             break;
     }
-
     return 0;
 }
 /*****************************************************************************/
diff --git a/neutrinordp/xrdp-neutrinordp.c b/neutrinordp/xrdp-neutrinordp.c
index 89e8f2ea..543e91d3 100644
--- a/neutrinordp/xrdp-neutrinordp.c
+++ b/neutrinordp/xrdp-neutrinordp.c
@@ -27,6 +27,12 @@
 #include "log.h"
 #include <freerdp/settings.h>
 
+#if defined(VERSION_STRUCT_RDP_FREERDP)
+#if VERSION_STRUCT_RDP_FREERDP > 1
+#define NEUTRINORDP_HAS_SUPPRESS_OUTPUT
+#endif
+#endif
+
 #ifdef XRDP_DEBUG
 #define LOG_LEVEL 99
 #else
@@ -541,6 +547,24 @@ lxrdp_check_wait_objs(struct mod *mod)
     return 0;
 }
 
+/******************************************************************************/
+static int
+lxrdp_frame_ack(struct mod* mod, int flags, int frame_id)
+{
+    return 0;
+}
+
+/******************************************************************************/
+static int
+lxrdp_suppress_output(struct mod* mod, int suppress,
+                      int left, int top, int right, int bottom)
+{
+#if defined(NEUTRINORDP_HAS_SUPPRESS_OUTPUT)
+    mod->inst->SendSuppressOutput(mod->inst, !suppress, left, top, right, bottom);
+#endif
+    return 0;
+}
+
 /******************************************************************************/
 static void
 lfreerdp_begin_paint(rdpContext *context)
@@ -2009,6 +2033,8 @@ mod_init(void)
     mod->mod_session_change = lxrdp_session_change;
     mod->mod_get_wait_objs = lxrdp_get_wait_objs;
     mod->mod_check_wait_objs = lxrdp_check_wait_objs;
+    mod->mod_frame_ack = lxrdp_frame_ack;
+    mod->mod_suppress_output = lxrdp_suppress_output;
 
     mod->inst = freerdp_new();
     mod->inst->PreConnect = lfreerdp_pre_connect;
diff --git a/neutrinordp/xrdp-neutrinordp.h b/neutrinordp/xrdp-neutrinordp.h
index f5986b8a..b68eb43a 100644
--- a/neutrinordp/xrdp-neutrinordp.h
+++ b/neutrinordp/xrdp-neutrinordp.h
@@ -58,7 +58,7 @@ struct pointer_item
     int bpp;
 };
 
-#define CURRENT_MOD_VER 3
+#define CURRENT_MOD_VER 4
 
 struct mod
 {
@@ -76,8 +76,11 @@ struct mod
     int (*mod_get_wait_objs)(struct mod *v, tbus *read_objs, int *rcount,
                              tbus *write_objs, int *wcount, int *timeout);
     int (*mod_check_wait_objs)(struct mod *v);
-    tintptr mod_dumby[100 - 9]; /* align, 100 minus the number of mod
-                                 functions above */
+    int (*mod_frame_ack)(struct mod* mod, int flags, int frame_id);
+    int (*mod_suppress_output)(struct mod* mod, int suppress,
+                             int left, int top, int right, int bottom);
+    tintptr mod_dumby[100 - 11]; /* align, 100 minus the number of mod
+                                    functions above */
     /* server functions */
     int (*server_begin_update)(struct mod *v);
     int (*server_end_update)(struct mod *v);
diff --git a/vnc/vnc.c b/vnc/vnc.c
index b0eb29b3..86eff852 100644
--- a/vnc/vnc.c
+++ b/vnc/vnc.c
@@ -380,20 +380,23 @@ lib_mod_event(struct vnc *v, int msg, long param1, long param2,
     }
     else if (msg == 200) /* invalidate */
     {
-        /* FramebufferUpdateRequest */
-        init_stream(s, 8192);
-        out_uint8(s, 3);
-        out_uint8(s, 0);
-        x = (param1 >> 16) & 0xffff;
-        out_uint16_be(s, x);
-        y = param1 & 0xffff;
-        out_uint16_be(s, y);
-        cx = (param2 >> 16) & 0xffff;
-        out_uint16_be(s, cx);
-        cy = param2 & 0xffff;
-        out_uint16_be(s, cy);
-        s_mark_end(s);
-        error = lib_send_copy(v, s);
+        if (v->suppress_output == 0)
+        {
+            /* FramebufferUpdateRequest */
+            init_stream(s, 8192);
+            out_uint8(s, 3);
+            out_uint8(s, 0);
+            x = (param1 >> 16) & 0xffff;
+            out_uint16_be(s, x);
+            y = param1 & 0xffff;
+            out_uint16_be(s, y);
+            cx = (param2 >> 16) & 0xffff;
+            out_uint16_be(s, cx);
+            cy = param2 & 0xffff;
+            out_uint16_be(s, cy);
+            s_mark_end(s);
+            error = lib_send_copy(v, s);
+        }
     }
 
     free_stream(s);
@@ -742,16 +745,19 @@ lib_framebuffer_update(struct vnc *v)
 
     if (error == 0)
     {
-        /* FramebufferUpdateRequest */
-        init_stream(s, 8192);
-        out_uint8(s, 3);
-        out_uint8(s, 1);
-        out_uint16_be(s, 0);
-        out_uint16_be(s, 0);
-        out_uint16_be(s, v->mod_width);
-        out_uint16_be(s, v->mod_height);
-        s_mark_end(s);
-        error = lib_send_copy(v, s);
+        if (v->suppress_output == 0)
+        {
+            /* FramebufferUpdateRequest */
+            init_stream(s, 8192);
+            out_uint8(s, 3);
+            out_uint8(s, 1);
+            out_uint16_be(s, 0);
+            out_uint16_be(s, 0);
+            out_uint16_be(s, v->mod_width);
+            out_uint16_be(s, v->mod_height);
+            s_mark_end(s);
+            error = lib_send_copy(v, s);
+        }
     }
 
     free_stream(s);
@@ -916,7 +922,7 @@ lib_mod_process_message(struct vnc *v, struct stream *s)
         }
         else
         {
-            g_sprintf(text, "VNC unknown in lib_mod_signal %d", type);
+            g_sprintf(text, "VNC unknown in lib_mod_process_message %d", type);
             v->server_msg(v, text, 1);
         }
     }
@@ -1340,17 +1346,20 @@ lib_mod_connect(struct vnc *v)
 
     if (error == 0)
     {
-        /* FramebufferUpdateRequest */
-        init_stream(s, 8192);
-        out_uint8(s, 3);
-        out_uint8(s, 0);
-        out_uint16_be(s, 0);
-        out_uint16_be(s, 0);
-        out_uint16_be(s, v->mod_width);
-        out_uint16_be(s, v->mod_height);
-        v->server_msg(v, "VNC sending framebuffer update request", 0);
-        s_mark_end(s);
-        error = trans_force_write_s(v->trans, s);
+        if (v->suppress_output == 0)
+        {
+            /* FramebufferUpdateRequest */
+            init_stream(s, 8192);
+            out_uint8(s, 3);
+            out_uint8(s, 0);
+            out_uint16_be(s, 0);
+            out_uint16_be(s, 0);
+            out_uint16_be(s, v->mod_width);
+            out_uint16_be(s, v->mod_height);
+            v->server_msg(v, "VNC sending framebuffer update request", 0);
+            s_mark_end(s);
+            error = trans_force_write_s(v->trans, s);
+        }
     }
 
     if (error == 0)
@@ -1492,6 +1501,43 @@ lib_mod_check_wait_objs(struct vnc *v)
     return rv;
 }
 
+/******************************************************************************/
+/* return error */
+int
+lib_mod_frame_ack(struct vnc* v, int flags, int frame_id)
+{
+    return 0;
+}
+
+/******************************************************************************/
+/* return error */
+int
+lib_mod_suppress_output(struct vnc* v, int suppress,
+                        int left, int top, int right, int bottom)
+{
+    int error;
+    struct stream *s;
+
+    error = 0;
+    v->suppress_output = suppress;
+    if (suppress == 0)
+    {
+        /* FramebufferUpdateRequest */
+        make_stream(s);
+        init_stream(s, 8192);
+        out_uint8(s, 3);
+        out_uint8(s, 0);
+        out_uint16_be(s, 0);
+        out_uint16_be(s, 0);
+        out_uint16_be(s, v->mod_width);
+        out_uint16_be(s, v->mod_height);
+        s_mark_end(s);
+        error = lib_send_copy(v, s);
+        free_stream(s);
+    }
+    return error;
+}
+
 /******************************************************************************/
 tintptr EXPORT_CC
 mod_init(void)
@@ -1511,6 +1557,8 @@ mod_init(void)
     v->mod_set_param = lib_mod_set_param;
     v->mod_get_wait_objs = lib_mod_get_wait_objs;
     v->mod_check_wait_objs = lib_mod_check_wait_objs;
+    v->mod_frame_ack = lib_mod_frame_ack;
+    v->mod_suppress_output = lib_mod_suppress_output;
     return (tintptr) v;
 }
 
diff --git a/vnc/vnc.h b/vnc/vnc.h
index 3eee4e09..5aa83472 100644
--- a/vnc/vnc.h
+++ b/vnc/vnc.h
@@ -24,7 +24,7 @@
 #include "os_calls.h"
 #include "defines.h"
 
-#define CURRENT_MOD_VER 3
+#define CURRENT_MOD_VER 4
 
 struct vnc
 {
@@ -42,8 +42,11 @@ struct vnc
   int (*mod_get_wait_objs)(struct vnc* v, tbus* read_objs, int* rcount,
                            tbus* write_objs, int* wcount, int* timeout);
   int (*mod_check_wait_objs)(struct vnc* v);
-  tintptr mod_dumby[100 - 9]; /* align, 100 minus the number of mod
-                                 functions above */
+  int (*mod_frame_ack)(struct vnc* v, int flags, int frame_id);
+  int (*mod_suppress_output)(struct vnc* v, int suppress,
+                             int left, int top, int right, int bottom);
+  tintptr mod_dumby[100 - 11]; /* align, 100 minus the number of mod
+                                  functions above */
   /* server functions */
   int (*server_begin_update)(struct vnc* v);
   int (*server_end_update)(struct vnc* v);
@@ -116,4 +119,5 @@ struct vnc
   struct trans *trans;
   int got_guid;
   tui8 guid[16];
+  int suppress_output;
 };
diff --git a/xrdp/xrdp.h b/xrdp/xrdp.h
index 5ed46a3a..498dc141 100644
--- a/xrdp/xrdp.h
+++ b/xrdp/xrdp.h
@@ -371,6 +371,9 @@ xrdp_bitmap_compress(char* in_data, int width, int height,
 /* xrdp_mm.c */
 int
 xrdp_mm_drdynvc_up(struct xrdp_mm* self);
+int
+xrdp_mm_suppress_output(struct xrdp_mm* self, int suppress,
+                        int left, int top, int right, int bottom);
 struct xrdp_mm*
 xrdp_mm_create(struct xrdp_wm* owner);
 void
diff --git a/xrdp/xrdp_mm.c b/xrdp/xrdp_mm.c
index 757620ac..96c6945c 100644
--- a/xrdp/xrdp_mm.c
+++ b/xrdp/xrdp_mm.c
@@ -999,6 +999,25 @@ xrdp_mm_drdynvc_up(struct xrdp_mm* self)
     return 0;
 }
 
+/******************************************************************************/
+int
+xrdp_mm_suppress_output(struct xrdp_mm* self, int suppress,
+                        int left, int top, int right, int bottom)
+{
+    LLOGLN(0, ("xrdp_mm_suppress_output: suppress %d "
+           "left %d top %d right %d bottom %d",
+           suppress, left, top, right, bottom));
+    if (self->mod != NULL)
+    {
+        if (self->mod->mod_suppress_output != NULL)
+        {
+            self->mod->mod_suppress_output(self->mod, suppress,
+                                           left, top, right, bottom);
+        }
+    }
+    return 0;
+}
+
 /*****************************************************************************/
 /* open response from client going to channel server */
 static int
diff --git a/xrdp/xrdp_types.h b/xrdp/xrdp_types.h
index 7e416125..dc6db4bc 100644
--- a/xrdp/xrdp_types.h
+++ b/xrdp/xrdp_types.h
@@ -48,7 +48,9 @@ struct xrdp_mod
                            tbus* write_objs, int* wcount, int* timeout);
   int (*mod_check_wait_objs)(struct xrdp_mod* v);
   int (*mod_frame_ack)(struct xrdp_mod* v, int flags, int frame_id);
-  tintptr mod_dumby[100 - 10]; /* align, 100 minus the number of mod
+  int (*mod_suppress_output)(struct xrdp_mod* v, int suppress,
+                             int left, int top, int right, int bottom);
+  tintptr mod_dumby[100 - 11]; /* align, 100 minus the number of mod
                                   functions above */
   /* server functions */
   int (*server_begin_update)(struct xrdp_mod* v);
diff --git a/xrdp/xrdp_wm.c b/xrdp/xrdp_wm.c
index fd7b13b8..f68b11e9 100644
--- a/xrdp/xrdp_wm.c
+++ b/xrdp/xrdp_wm.c
@@ -1916,6 +1916,11 @@ callback(intptr_t id, int msg, intptr_t param1, intptr_t param2,
         case 0x5558:
             xrdp_mm_drdynvc_up(wm->mm);
             break;
+        case 0x5559:
+            xrdp_mm_suppress_output(wm->mm, param1,
+                                    LOWORD(param2), HIWORD(param2),
+                                    LOWORD(param3), HIWORD(param3));
+            break;
     }
     return rv;
 }
diff --git a/xup/xup.c b/xup/xup.c
index 91eb0563..23722456 100644
--- a/xup/xup.c
+++ b/xup/xup.c
@@ -1143,6 +1143,33 @@ send_paint_rect_ex_ack(struct mod *mod, int flags, int frame_id)
     return 0;
 }
 
+/******************************************************************************/
+/* return error */
+static int
+send_suppress_output(struct mod *mod, int suppress,
+                     int left, int top, int right, int bottom)
+{
+    int len;
+    struct stream *s;
+
+    make_stream(s);
+    init_stream(s, 8192);
+    s_push_layer(s, iso_hdr, 4);
+    out_uint16_le(s, 108);
+    out_uint32_le(s, suppress);
+    out_uint32_le(s, left);
+    out_uint32_le(s, top);
+    out_uint32_le(s, right);
+    out_uint32_le(s, bottom);
+    s_mark_end(s);
+    len = (int)(s->end - s->data);
+    s_pop_layer(s, iso_hdr);
+    out_uint32_le(s, len);
+    lib_send_copy(mod, s);
+    free_stream(s);
+    return 0;
+}
+
 /******************************************************************************/
 /* return error */
 static int
@@ -1556,6 +1583,18 @@ lib_mod_frame_ack(struct mod *amod, int flags, int frame_id)
     return 0;
 }
 
+/******************************************************************************/
+/* return error */
+int
+lib_mod_suppress_output(struct mod *amod, int suppress,
+                        int left, int top, int right, int bottom)
+{
+    LLOGLN(10, ("lib_mod_suppress_output: suppress 0x%8.8x left %d top %d "
+           "right %d bottom %d", suppress, left, top, right, bottom));
+    send_suppress_output(amod, suppress, left, top, right, bottom);
+    return 0;
+}
+
 /******************************************************************************/
 tintptr EXPORT_CC
 mod_init(void)
@@ -1575,6 +1614,7 @@ mod_init(void)
     mod->mod_get_wait_objs = lib_mod_get_wait_objs;
     mod->mod_check_wait_objs = lib_mod_check_wait_objs;
     mod->mod_frame_ack = lib_mod_frame_ack;
+    mod->mod_suppress_output = lib_mod_suppress_output;
     return (tintptr) mod;
 }
 
diff --git a/xup/xup.h b/xup/xup.h
index 3e5c8e8d..ddd24e36 100644
--- a/xup/xup.h
+++ b/xup/xup.h
@@ -26,7 +26,7 @@
 #include "xrdp_client_info.h"
 #include "xrdp_rail.h"
 
-#define CURRENT_MOD_VER 3
+#define CURRENT_MOD_VER 4
 
 struct mod
 {
@@ -45,7 +45,9 @@ struct mod
                            tbus* write_objs, int* wcount, int* timeout);
   int (*mod_check_wait_objs)(struct mod* v);
   int (*mod_frame_ack)(struct mod* v, int flags, int frame_id);
-  tintptr mod_dumby[100 - 10]; /* align, 100 minus the number of mod
+  int (*mod_suppress_output)(struct mod* v, int suppress,
+                             int left, int top, int right, int bottom);
+  tintptr mod_dumby[100 - 11]; /* align, 100 minus the number of mod
                                  functions above */
   /* server functions */
   int (*server_begin_update)(struct mod* v);