diff -Nru unity-settings-daemon-15.04.1+15.10.20151012/debian/changelog unity-settings-daemon-15.04.1+15.10.20151021/debian/changelog
--- unity-settings-daemon-15.04.1+15.10.20151012/debian/changelog	2015-10-21 11:10:15.000000000 +0000
+++ unity-settings-daemon-15.04.1+15.10.20151021/debian/changelog	2015-10-21 11:10:15.000000000 +0000
@@ -1,3 +1,10 @@
+unity-settings-daemon (15.04.1+15.10.20151021-0ubuntu1) wily; urgency=medium
+
+  [ Lars Uebernickel ]
+  * power: disconnect from device's "notify" signals (LP: #1436861)
+
+ -- Sebastien Bacher <seb128@ubuntu.com>  Wed, 21 Oct 2015 11:05:04 +0000
+
 unity-settings-daemon (15.04.1+15.10.20151012-0ubuntu1) wily; urgency=medium
 
   [ "Jan Alexander Steffens (heftig)" ]
diff -Nru unity-settings-daemon-15.04.1+15.10.20151012/plugins/power/gsd-power-manager.c unity-settings-daemon-15.04.1+15.10.20151021/plugins/power/gsd-power-manager.c
--- unity-settings-daemon-15.04.1+15.10.20151012/plugins/power/gsd-power-manager.c	2015-10-12 14:39:26.000000000 +0000
+++ unity-settings-daemon-15.04.1+15.10.20151021/plugins/power/gsd-power-manager.c	2015-10-21 11:05:00.000000000 +0000
@@ -3430,6 +3430,9 @@
 void
 gsd_power_manager_stop (GsdPowerManager *manager)
 {
+        GPtrArray *devices;
+        int i;
+
         g_debug ("Stopping power manager");
 
         if (manager->priv->inhibit_lid_switch_timer_id != 0) {
@@ -3481,8 +3484,12 @@
         g_clear_object (&manager->priv->logind_proxy);
         g_clear_object (&manager->priv->rr_screen);
 
-        g_ptr_array_unref (manager->priv->devices_array);
+        devices = manager->priv->devices_array;
+        for (i = 0; i < devices->len; i++)
+                g_signal_handlers_disconnect_by_data (g_ptr_array_index (devices, i), manager);
+        g_ptr_array_unref (devices);
         manager->priv->devices_array = NULL;
+
         g_clear_object (&manager->priv->device_composite);
         g_clear_object (&manager->priv->previous_icon);