diff --git a/sys/dev/drm2/drm_crtc.c b/sys/dev/drm2/drm_crtc.c
index ae40eb2..297013c 100644
--- a/sys/dev/drm2/drm_crtc.c
+++ b/sys/dev/drm2/drm_crtc.c
@@ -973,8 +973,10 @@ void drm_mode_config_cleanup(struct drm_device *dev)
 		encoder->funcs->destroy(encoder);
 	}
 
+	DRM_INFO("%s: Destroy all connectors of dev %p\n", __func__, dev);
 	list_for_each_entry_safe(connector, ot,
 				 &dev->mode_config.connector_list, head) {
+		DRM_INFO("%s: -> connector %p\n", __func__, connector);
 		connector->funcs->destroy(connector);
 	}
 
diff --git a/sys/dev/drm2/drm_dp_iic_helper.c b/sys/dev/drm2/drm_dp_iic_helper.c
index 71319e3..7a5ea65 100644
--- a/sys/dev/drm2/drm_dp_iic_helper.c
+++ b/sys/dev/drm2/drm_dp_iic_helper.c
@@ -26,6 +26,8 @@ __FBSDID("$FreeBSD$");
 #include <sys/types.h>
 #include <sys/kobj.h>
 #include <sys/bus.h>
+#include <sys/param.h>
+#include <sys/stack.h>
 #include <dev/iicbus/iic.h>
 #include "iicbus_if.h"
 #include <dev/iicbus/iiconf.h>
@@ -183,7 +185,7 @@ iic_dp_aux_reset(device_t idev, u_char speed, u_char addr, u_char *oldaddr)
 {
 
 	iic_dp_aux_reset_bus(idev);
-	return (0);				   
+	return (0);
 }
 
 static int
@@ -206,11 +208,17 @@ static int
 iic_dp_aux_attach(device_t idev)
 {
 	struct iic_dp_aux_data *aux_data;
+	struct stack *st;
 
 	aux_data = device_get_softc(idev);
 	aux_data->port = device_add_child(idev, "iicbus", -1);
 	if (aux_data->port == NULL)
 		return (ENXIO);
+	DRM_INFO("%s: idev=%p port=%p\n", __func__, idev, aux_data->port);
+	st = stack_create();
+	stack_save(st);
+	stack_print(st);
+	stack_destroy(st);
 	device_quiet(aux_data->port);
 	bus_generic_attach(idev);
 	return (0);
@@ -226,8 +234,16 @@ iic_dp_aux_detach(device_t idev)
 
 	port = aux_data->port;
 	bus_generic_detach(idev);
-	if (port != NULL)
+	if (port != NULL) {
+		struct stack *st;
+		DRM_INFO("%s: idev=%p port=%p\n", __func__, idev, aux_data->port);
+		st = stack_create();
+		stack_save(st);
+		stack_print(st);
+		stack_destroy(st);
 		device_delete_child(idev, port);
+		aux_data->port = NULL;
+	}
 
 	return (0);
 }
diff --git a/sys/dev/drm2/radeon/radeon_connectors.c b/sys/dev/drm2/radeon/radeon_connectors.c
index 57d7c26..1088f23 100644
--- a/sys/dev/drm2/radeon/radeon_connectors.c
+++ b/sys/dev/drm2/radeon/radeon_connectors.c
@@ -1208,8 +1208,10 @@ static void radeon_dp_connector_destroy(struct drm_connector *connector)
 
 	if (radeon_connector->edid)
 		free(radeon_connector->edid, DRM_MEM_KMS);
-	if (radeon_dig_connector->dp_i2c_bus)
+	if (radeon_dig_connector->dp_i2c_bus) {
+		DRM_INFO("%s: destroy connector %p / %p / %p (bus %p)\n", __func__, connector, radeon_connector, radeon_dig_connector, radeon_dig_connector->dp_i2c_bus);
 		radeon_i2c_destroy(radeon_dig_connector->dp_i2c_bus);
+	}
 	free(radeon_connector->con_priv, DRM_MEM_DRIVER);
 #ifdef DUMBBELL_WIP
 	drm_sysfs_connector_remove(connector);
@@ -1590,6 +1592,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 				radeon_dig_connector->dp_i2c_bus = radeon_i2c_create_dp(dev, i2c_bus, "eDP-auxch");
 			else
 				radeon_dig_connector->dp_i2c_bus = radeon_i2c_create_dp(dev, i2c_bus, "DP-auxch");
+			DRM_INFO("%s: create connector %p / %p / %p (bus %p)\n", __func__, &radeon_connector->base, radeon_connector, radeon_dig_connector, radeon_dig_connector->dp_i2c_bus);
 			if (!radeon_dig_connector->dp_i2c_bus)
 				DRM_ERROR("DP: Failed to assign dp ddc bus! Check dmesg for i2c errors.\n");
 			radeon_connector->ddc_bus = radeon_i2c_lookup(rdev, i2c_bus);
@@ -1774,6 +1777,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 			if (i2c_bus->valid) {
 				/* add DP i2c bus */
 				radeon_dig_connector->dp_i2c_bus = radeon_i2c_create_dp(dev, i2c_bus, "DP-auxch");
+				DRM_INFO("%s: create connector %p / %p / %p (bus %p)\n", __func__, &radeon_connector->base, radeon_connector, radeon_dig_connector, radeon_dig_connector->dp_i2c_bus);
 				if (!radeon_dig_connector->dp_i2c_bus)
 					DRM_ERROR("DP: Failed to assign dp ddc bus! Check dmesg for i2c errors.\n");
 				radeon_connector->ddc_bus = radeon_i2c_lookup(rdev, i2c_bus);
@@ -1812,6 +1816,7 @@ radeon_add_atom_connector(struct drm_device *dev,
 			if (i2c_bus->valid) {
 				/* add DP i2c bus */
 				radeon_dig_connector->dp_i2c_bus = radeon_i2c_create_dp(dev, i2c_bus, "eDP-auxch");
+				DRM_INFO("%s: create connector %p / %p / %p (bus %p)\n", __func__, &radeon_connector->base, radeon_connector, radeon_dig_connector, radeon_dig_connector->dp_i2c_bus);
 				if (!radeon_dig_connector->dp_i2c_bus)
 					DRM_ERROR("DP: Failed to assign dp ddc bus! Check dmesg for i2c errors.\n");
 				radeon_connector->ddc_bus = radeon_i2c_lookup(rdev, i2c_bus);