--- a/src/pulsecore/core.h	2016-04-13 16:38:56.392014788 +0200
+++ b/src/pulsecore/core.h	2016-04-13 16:41:50.331014498 +0200
@@ -125,6 +125,7 @@
     PA_CORE_HOOK_CARD_PROFILE_ADDED,
     PA_CORE_HOOK_CARD_PROFILE_AVAILABLE_CHANGED,
     PA_CORE_HOOK_PORT_AVAILABLE_CHANGED,
+    PA_CORE_HOOK_PORT_ACTIVE_CHANGED,
     PA_CORE_HOOK_PORT_LATENCY_OFFSET_CHANGED,
     PA_CORE_HOOK_MAX
 } pa_core_hook_t;
--- a/src/pulsecore/device-port.c	2016-04-13 16:39:37.411014719 +0200
+++ b/src/pulsecore/device-port.c	2016-04-13 17:06:47.393011999 +0200
@@ -175,6 +175,21 @@
     pa_hook_fire(&core->hooks[PA_CORE_HOOK_PORT_LATENCY_OFFSET_CHANGED], p);
 }
 
+void pa_device_port_active_changed(pa_device_port *port, bool new_active) {
+    bool old_active;
+
+    pa_assert(port);
+
+    old_active = port->active;
+
+    if (new_active == old_active)
+        return;
+
+    port->active = new_active;
+    pa_log_debug("Port %s %s.", port->name, new_active ? "activated" : "deactivated");
+    pa_hook_fire(&port->core->hooks[PA_CORE_HOOK_PORT_ACTIVE_CHANGED], port);
+}
+
 pa_device_port *pa_device_port_find_best(pa_hashmap *ports)
 {
     void *state;
--- a/src/pulsecore/device-port.h	2016-04-13 16:39:51.603014696 +0200
+++ b/src/pulsecore/device-port.h	2016-04-13 17:07:12.649011957 +0200
@@ -46,6 +46,7 @@
 
     unsigned priority;
     pa_available_t available;         /* PA_AVAILABLE_UNKNOWN, PA_AVAILABLE_NO or PA_AVAILABLE_YES */
+    bool active;
 
     pa_proplist *proplist;
     pa_hashmap *profiles; /* Does not own the profiles */
--- a/src/pulsecore/sink.c	2016-04-13 16:40:11.131014663 +0200
+++ b/src/pulsecore/sink.c	2016-04-13 17:14:30.963011225 +0200
@@ -658,6 +658,9 @@
     else
         pa_assert_se(sink_set_state(s, PA_SINK_IDLE) == 0);
 
+    if (s->active_port)
+        pa_device_port_active_changed(s->active_port, true);
+
     pa_source_put(s->monitor_source);
 
     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK | PA_SUBSCRIPTION_EVENT_NEW, s->index);
@@ -685,6 +688,9 @@
     if (linked)
         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_UNLINK], s);
 
+    if (s->active_port)
+        pa_device_port_active_changed(s->active_port, false);
+
     if (s->state != PA_SINK_UNLINKED)
         pa_namereg_unregister(s->core, s->name);
     pa_idxset_remove_by_data(s->core->sinks, s, NULL);
@@ -3297,6 +3303,7 @@
 /* Called from main context */
 int pa_sink_set_port(pa_sink *s, const char *name, bool save) {
     pa_device_port *port;
+    pa_device_port *old_port;
     int ret;
 
     pa_sink_assert_ref(s);
@@ -3313,11 +3320,15 @@
     if (!(port = pa_hashmap_get(s->ports, name)))
         return -PA_ERR_NOENTITY;
 
-    if (s->active_port == port) {
+    old_port = s->active_port;
+
+    if (port == old_port) {
         s->save_port = s->save_port || save;
         return 0;
     }
 
+    pa_device_port_active_changed(old_port, false);
+
     if (s->flags & PA_SINK_DEFERRED_VOLUME) {
         struct sink_message_set_port msg = { .port = port, .ret = 0 };
         pa_assert_se(pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SINK_MESSAGE_SET_PORT, &msg, 0, NULL) == 0);
@@ -3326,17 +3337,26 @@
     else
         ret = s->set_port(s, port);
 
-    if (ret < 0)
-        return -PA_ERR_NOENTITY;
+    if (ret < 0) {
+        pa_log("Failed to set the port of sink %s from %s to %s.", s->name, old_port->name, port->name);
+
+        /* We don't know the real state of the device, but let's assume that
+         * the old port is still active, because s->active_port is left to
+         * point to the old port anyway. */
+        pa_device_port_active_changed(old_port, true);
+
+        return ret;
+    }
 
     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SINK|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 
-    pa_log_info("Changed port of sink %u \"%s\" to %s", s->index, s->name, port->name);
+    pa_log_info("Changed port of sink %u \"%s\" from %s to %s", s->index, s->name, old_port->name, port->name);
 
     s->active_port = port;
     s->save_port = save;
 
     pa_sink_set_latency_offset(s, s->active_port->latency_offset);
+    pa_device_port_active_changed(port, true);
 
     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SINK_PORT_CHANGED], s);
 
--- a/src/pulsecore/source.c	2016-04-13 16:40:25.290014640 +0200
+++ b/src/pulsecore/source.c	2016-04-13 17:21:26.051010533 +0200
@@ -603,6 +603,9 @@
     else
         pa_assert_se(source_set_state(s, PA_SOURCE_IDLE) == 0);
 
+    if (s->active_port)
+        pa_device_port_active_changed(s->active_port, true);
+
     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SOURCE | PA_SUBSCRIPTION_EVENT_NEW, s->index);
     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SOURCE_PUT], s);
 }
@@ -623,6 +626,9 @@
     if (linked)
         pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SOURCE_UNLINK], s);
 
+    if (s->active_port)
+        pa_device_port_active_changed(s->active_port, false);
+
     if (s->state != PA_SOURCE_UNLINKED)
         pa_namereg_unregister(s->core, s->name);
     pa_idxset_remove_by_data(s->core->sources, s, NULL);
@@ -2576,6 +2582,7 @@
 /* Called from main context */
 int pa_source_set_port(pa_source *s, const char *name, bool save) {
     pa_device_port *port;
+    pa_device_port *old_port;
     int ret;
 
     pa_source_assert_ref(s);
@@ -2592,11 +2599,15 @@
     if (!(port = pa_hashmap_get(s->ports, name)))
         return -PA_ERR_NOENTITY;
 
-    if (s->active_port == port) {
+    old_port = s->active_port;
+
+    if (port == old_port) {
         s->save_port = s->save_port || save;
         return 0;
     }
 
+    pa_device_port_active_changed(old_port, false);
+
     if (s->flags & PA_SOURCE_DEFERRED_VOLUME) {
         struct source_message_set_port msg = { .port = port, .ret = 0 };
         pa_assert_se(pa_asyncmsgq_send(s->asyncmsgq, PA_MSGOBJECT(s), PA_SOURCE_MESSAGE_SET_PORT, &msg, 0, NULL) == 0);
@@ -2605,16 +2616,26 @@
     else
         ret = s->set_port(s, port);
 
-    if (ret < 0)
-        return -PA_ERR_NOENTITY;
+    if (ret < 0) {
+        pa_log("Failed to set the port of sink %s from %s to %s.", s->name, old_port->name, port->name);
+
+        /* We don't know the real state of the device, but let's assume that
+         * the old port is still active, because s->active_port is left to
+         * point to the old port anyway. */
+        pa_device_port_active_changed(old_port, true);
+
+        return ret;
+    }
 
     pa_subscription_post(s->core, PA_SUBSCRIPTION_EVENT_SOURCE|PA_SUBSCRIPTION_EVENT_CHANGE, s->index);
 
-    pa_log_info("Changed port of source %u \"%s\" to %s", s->index, s->name, port->name);
+    pa_log_info("Changed port of source %u \"%s\" from %s to %s", s->index, s->name, old_port->name, port->name);
 
     s->active_port = port;
     s->save_port = save;
 
+    pa_device_port_active_changed(port, true);
+
     pa_hook_fire(&s->core->hooks[PA_CORE_HOOK_SOURCE_PORT_CHANGED], s);
 
     return 0;