diff --git a/drivers/gpu/drm/drm_atomic_uapi.c b/drivers/gpu/drm/drm_atomic_uapi.c
index 9a1f41adfc67..06390307e5a3 100644
--- a/drivers/gpu/drm/drm_atomic_uapi.c
+++ b/drivers/gpu/drm/drm_atomic_uapi.c
@@ -1321,11 +1321,14 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
 
 		obj = drm_mode_object_find(dev, file_priv, obj_id, DRM_MODE_OBJECT_ANY);
 		if (!obj) {
+			DRM_DEBUG_ATOMIC("Unknown object ID %d\n", obj_id);
 			ret = -ENOENT;
 			goto out;
 		}
 
 		if (!obj->properties) {
+			DRM_DEBUG_ATOMIC("Object ID %d has no properties\n",
+					 obj_id);
 			drm_mode_object_put(obj);
 			ret = -ENOENT;
 			goto out;
@@ -1352,6 +1355,8 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
 
 			prop = drm_mode_obj_find_prop_id(obj, prop_id);
 			if (!prop) {
+				DRM_DEBUG_ATOMIC("Unknown property ID %d\n",
+						 prop_id);
 				drm_mode_object_put(obj);
 				ret = -ENOENT;
 				goto out;
diff --git a/drivers/gpu/drm/drm_color_mgmt.c b/drivers/gpu/drm/drm_color_mgmt.c
index 07dcf47daafe..a99ee15b8328 100644
--- a/drivers/gpu/drm/drm_color_mgmt.c
+++ b/drivers/gpu/drm/drm_color_mgmt.c
@@ -245,8 +245,10 @@ int drm_mode_gamma_set_ioctl(struct drm_device *dev,
 		return -EOPNOTSUPP;
 
 	crtc = drm_crtc_find(dev, file_priv, crtc_lut->crtc_id);
-	if (!crtc)
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_lut->crtc_id);
 		return -ENOENT;
+	}
 
 	if (crtc->funcs->gamma_set == NULL)
 		return -ENOSYS;
@@ -313,8 +315,10 @@ int drm_mode_gamma_get_ioctl(struct drm_device *dev,
 		return -EOPNOTSUPP;
 
 	crtc = drm_crtc_find(dev, file_priv, crtc_lut->crtc_id);
-	if (!crtc)
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_lut->crtc_id);
 		return -ENOENT;
+	}
 
 	/* memcpy into gamma store */
 	if (crtc_lut->gamma_size != crtc->gamma_size)
diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
index 847539645558..8745eb132fd4 100644
--- a/drivers/gpu/drm/drm_connector.c
+++ b/drivers/gpu/drm/drm_connector.c
@@ -1952,8 +1952,11 @@ int drm_mode_getconnector(struct drm_device *dev, void *data,
 	memset(&u_mode, 0, sizeof(struct drm_mode_modeinfo));
 
 	connector = drm_connector_lookup(dev, file_priv, out_resp->connector_id);
-	if (!connector)
+	if (!connector) {
+		DRM_DEBUG_KMS("Unknown connector ID %d\n",
+			      out_resp->connector_id);
 		return -ENOENT;
+	}
 
 	drm_connector_for_each_possible_encoder(connector, encoder, i)
 		encoders_count++;
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 7dabbaf033a1..e5f234ffcd23 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -369,8 +369,10 @@ int drm_mode_getcrtc(struct drm_device *dev,
 		return -EOPNOTSUPP;
 
 	crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
-	if (!crtc)
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", crtc_resp->crtc_id);
 		return -ENOENT;
+	}
 
 	plane = crtc->primary;
 
@@ -586,8 +588,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 		} else {
 			fb = drm_framebuffer_lookup(dev, file_priv, crtc_req->fb_id);
 			if (!fb) {
-				DRM_DEBUG_KMS("Unknown FB ID%d\n",
-						crtc_req->fb_id);
+				DRM_DEBUG_KMS("Unknown FB ID %d\n",
+					      crtc_req->fb_id);
 				ret = -ENOENT;
 				goto out;
 			}
@@ -682,8 +684,8 @@ int drm_mode_setcrtc(struct drm_device *dev, void *data,
 
 			connector = drm_connector_lookup(dev, file_priv, out_id);
 			if (!connector) {
-				DRM_DEBUG_KMS("Connector id %d unknown\n",
-						out_id);
+				DRM_DEBUG_KMS("Unknown connector ID %d\n",
+					      out_id);
 				ret = -ENOENT;
 				goto out;
 			}
diff --git a/drivers/gpu/drm/drm_encoder.c b/drivers/gpu/drm/drm_encoder.c
index b694fb57eaa4..107f3fff3f3f 100644
--- a/drivers/gpu/drm/drm_encoder.c
+++ b/drivers/gpu/drm/drm_encoder.c
@@ -225,8 +225,10 @@ int drm_mode_getencoder(struct drm_device *dev, void *data,
 		return -EOPNOTSUPP;
 
 	encoder = drm_encoder_find(dev, file_priv, enc_resp->encoder_id);
-	if (!encoder)
+	if (!encoder) {
+		DRM_DEBUG_KMS("Unknown encoder ID %d\n", enc_resp->encoder_id);
 		return -ENOENT;
+	}
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
 	crtc = drm_encoder_get_crtc(encoder);
diff --git a/drivers/gpu/drm/drm_framebuffer.c b/drivers/gpu/drm/drm_framebuffer.c
index 7abcb265a108..54f36bf7631e 100644
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -431,8 +431,10 @@ int drm_mode_rmfb(struct drm_device *dev, u32 fb_id,
 		return -EOPNOTSUPP;
 
 	fb = drm_framebuffer_lookup(dev, file_priv, fb_id);
-	if (!fb)
+	if (!fb) {
+		DRM_DEBUG_KMS("Unknown FB ID %d\n", fb_id);
 		return -ENOENT;
+	}
 
 	mutex_lock(&file_priv->fbs_lock);
 	list_for_each_entry(fbl, &file_priv->fbs, filp_head)
diff --git a/drivers/gpu/drm/drm_mode_object.c b/drivers/gpu/drm/drm_mode_object.c
index a9005c1c2384..e8dac94d576d 100644
--- a/drivers/gpu/drm/drm_mode_object.c
+++ b/drivers/gpu/drm/drm_mode_object.c
@@ -388,10 +388,13 @@ int drm_mode_obj_get_properties_ioctl(struct drm_device *dev, void *data,
 
 	obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
 	if (!obj) {
+		DRM_DEBUG_KMS("Unknown object ID %d (type 0x%x)\n",
+			      arg->obj_id, arg->obj_type);
 		ret = -ENOENT;
 		goto out;
 	}
 	if (!obj->properties) {
+		DRM_DEBUG_KMS("Object ID %d has no properties\n", arg->obj_id);
 		ret = -EINVAL;
 		goto out_unref;
 	}
@@ -509,15 +512,23 @@ int drm_mode_obj_set_property_ioctl(struct drm_device *dev, void *data,
 		return -EOPNOTSUPP;
 
 	arg_obj = drm_mode_object_find(dev, file_priv, arg->obj_id, arg->obj_type);
-	if (!arg_obj)
+	if (!arg_obj) {
+		DRM_DEBUG_KMS("Unknown object ID %d (type 0x%x)\n",
+			      arg->obj_id, arg->obj_type);
 		return -ENOENT;
+	}
 
-	if (!arg_obj->properties)
+	if (!arg_obj->properties) {
+		DRM_DEBUG_KMS("Object ID %d has no properties\n",
+			      arg->prop_id);
 		goto out_unref;
+	}
 
 	property = drm_mode_obj_find_prop_id(arg_obj, arg->prop_id);
-	if (!property)
+	if (!property) {
+		DRM_DEBUG_KMS("Unknown property ID %d\n", arg->prop_id);
 		goto out_unref;
+	}
 
 	if (drm_drv_uses_atomic_modeset(property->dev))
 		ret = set_property_atomic(arg_obj, property, arg->value);
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 4cfb56893b7f..830af4c60d55 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -520,8 +520,10 @@ int drm_mode_getplane(struct drm_device *dev, void *data,
 		return -EOPNOTSUPP;
 
 	plane = drm_plane_find(dev, file_priv, plane_resp->plane_id);
-	if (!plane)
+	if (!plane) {
+		DRM_DEBUG_KMS("Unknown plane ID %d\n", plane_resp->plane_id);
 		return -ENOENT;
+	}
 
 	drm_modeset_lock(&plane->mutex, NULL);
 	if (plane->state && plane->state->crtc && drm_lease_held(file_priv, plane->state->crtc->base.id))
@@ -813,7 +815,7 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
 	if (plane_req->fb_id) {
 		fb = drm_framebuffer_lookup(dev, file_priv, plane_req->fb_id);
 		if (!fb) {
-			DRM_DEBUG_KMS("Unknown framebuffer ID %d\n",
+			DRM_DEBUG_KMS("Unknown FB ID %d\n",
 				      plane_req->fb_id);
 			return -ENOENT;
 		}
@@ -821,7 +823,7 @@ int drm_mode_setplane(struct drm_device *dev, void *data,
 		crtc = drm_crtc_find(dev, file_priv, plane_req->crtc_id);
 		if (!crtc) {
 			drm_framebuffer_put(fb);
-			DRM_DEBUG_KMS("Unknown crtc ID %d\n",
+			DRM_DEBUG_KMS("Unknown CRTC ID %d\n",
 				      plane_req->crtc_id);
 			return -ENOENT;
 		}
@@ -1057,8 +1059,10 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 		return -EINVAL;
 
 	crtc = drm_crtc_find(dev, file_priv, page_flip->crtc_id);
-	if (!crtc)
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", page_flip->crtc_id);
 		return -ENOENT;
+	}
 
 	plane = crtc->primary;
 
@@ -1126,6 +1130,7 @@ int drm_mode_page_flip_ioctl(struct drm_device *dev,
 
 	fb = drm_framebuffer_lookup(dev, file_priv, page_flip->fb_id);
 	if (!fb) {
+		DRM_DEBUG_KMS("Unknown FB ID %d\n", page_flip->fb_id);
 		ret = -ENOENT;
 		goto out;
 	}
diff --git a/drivers/gpu/drm/drm_property.c b/drivers/gpu/drm/drm_property.c
index 79c77c3cad86..254b71493221 100644
--- a/drivers/gpu/drm/drm_property.c
+++ b/drivers/gpu/drm/drm_property.c
@@ -467,8 +467,10 @@ int drm_mode_getproperty_ioctl(struct drm_device *dev,
 		return -EOPNOTSUPP;
 
 	property = drm_property_find(dev, file_priv, out_resp->prop_id);
-	if (!property)
+	if (!property) {
+		DRM_DEBUG_KMS("Unknwon property ID %d\n", out_resp->prop_id);
 		return -ENOENT;
+	}
 
 	strncpy(out_resp->name, property->name, DRM_PROP_NAME_LEN);
 	out_resp->name[DRM_PROP_NAME_LEN-1] = 0;
@@ -760,8 +762,10 @@ int drm_mode_getblob_ioctl(struct drm_device *dev,
 		return -EOPNOTSUPP;
 
 	blob = drm_property_lookup_blob(dev, out_resp->blob_id);
-	if (!blob)
+	if (!blob) {
+		DRM_DEBUG_KMS("Unknwon blob ID %d\n", out_resp->blob_id);
 		return -ENOENT;
+	}
 
 	if (out_resp->length == blob->length) {
 		if (copy_to_user(u64_to_user_ptr(out_resp->data),
@@ -826,8 +830,10 @@ int drm_mode_destroyblob_ioctl(struct drm_device *dev,
 		return -EOPNOTSUPP;
 
 	blob = drm_property_lookup_blob(dev, out_resp->blob_id);
-	if (!blob)
+	if (!blob) {
+		DRM_DEBUG_KMS("Unknwon blob ID %d\n", out_resp->blob_id);
 		return -ENOENT;
+	}
 
 	mutex_lock(&dev->mode_config.blob_lock);
 	/* Ensure the property was actually created by this user. */
diff --git a/drivers/gpu/drm/drm_vblank.c b/drivers/gpu/drm/drm_vblank.c
index cde71ee95a8f..793acfa5002e 100644
--- a/drivers/gpu/drm/drm_vblank.c
+++ b/drivers/gpu/drm/drm_vblank.c
@@ -1816,8 +1816,10 @@ int drm_crtc_get_sequence_ioctl(struct drm_device *dev, void *data,
 		return -EINVAL;
 
 	crtc = drm_crtc_find(dev, file_priv, get_seq->crtc_id);
-	if (!crtc)
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", get_seq->crtc_id);
 		return -ENOENT;
+	}
 
 	pipe = drm_crtc_index(crtc);
 
@@ -1874,8 +1876,10 @@ int drm_crtc_queue_sequence_ioctl(struct drm_device *dev, void *data,
 		return -EINVAL;
 
 	crtc = drm_crtc_find(dev, file_priv, queue_seq->crtc_id);
-	if (!crtc)
+	if (!crtc) {
+		DRM_DEBUG_KMS("Unknown CRTC ID %d\n", queue_seq->crtc_id);
 		return -ENOENT;
+	}
 
 	flags = queue_seq->flags;
 	/* Check valid flag bits */
