Index: uspace/app/devctl/devctl.c
===================================================================
--- uspace/app/devctl/devctl.c	(revision 3f57fb73696fea31ef6a619b390a707b4091eda9)
+++ uspace/app/devctl/devctl.c	(revision 951f32ce8d4ff8508530ae4ef61d13827f1b2c0f)
@@ -151,5 +151,6 @@
 	rc = devman_fun_offline(funh);
 	if (rc != EOK) {
-		printf(NAME ": Failed to offline function '%s'.\n", path);
+		printf(NAME ": Failed to offline function '%s' (%s)\n", path,
+		    str_error(rc));
 		return rc;
 	}