Index: uspace/drv/infrastructure/root/root.c
===================================================================
--- uspace/drv/infrastructure/root/root.c	(revision a05f2af2f058ddcf89958654f2feb3db043e5a3d)
+++ uspace/drv/infrastructure/root/root.c	(revision aaceebc420bd2787add67fcb464322186d7e2973)
@@ -208,11 +208,13 @@
 	/*
 	 * Register virtual devices root.
-	 * We ignore error occurrence because virtual devices shall not be
+	 * We warn on error occurrence because virtual devices shall not be
 	 * vital for the system.
 	 */
-	(void) add_virtual_root_fun(dev);
+	int res = add_virtual_root_fun(dev);
+	if (res != EOK)
+		ddf_msg(LVL_WARN, "Failed to add virtual child.");
 
 	/* Register root device's children. */
-	int res = add_platform_fun(dev);
+	res = add_platform_fun(dev);
 	if (EOK != res)
 		ddf_msg(LVL_ERROR, "Failed adding child device for platform.");
Index: uspace/srv/hid/compositor/compositor.c
===================================================================
--- uspace/srv/hid/compositor/compositor.c	(revision a05f2af2f058ddcf89958654f2feb3db043e5a3d)
+++ uspace/srv/hid/compositor/compositor.c	(revision aaceebc420bd2787add67fcb464322186d7e2973)
@@ -2092,6 +2092,8 @@
 	/* Establish input bidirectional connection. */
 	rc = input_connect(input_svc);
-	if (rc != EOK)
+	if (rc != EOK) {
+		printf("%s: Failed to connect to input service.\n", NAME);
 		return rc;
+	}
 
 	/* Create viewports and connect them to visualizers. */
@@ -2099,4 +2101,5 @@
 	rc = loc_category_get_id("visualizer", &cat_id, IPC_FLAG_BLOCKING);
 	if (rc != EOK) {
+		printf("%s: Failed to get visualizer category.\n", NAME);
 		input_disconnect();
 		return -1;
@@ -2107,4 +2110,5 @@
 	rc = loc_category_get_svcs(cat_id, &svcs, &svcs_cnt);
 	if (rc != EOK || svcs_cnt == 0) {
+		printf("%s: Failed to get visualizer category services.\n", NAME);
 		input_disconnect();
 		return -1;
@@ -2123,4 +2127,5 @@
 	
 	if (list_empty(&viewport_list)) {
+		printf("%s: Failed to get view ports.\n", NAME);
 		input_disconnect();
 		return -1;