Index: uspace/app/devctl/devctl.c
===================================================================
--- uspace/app/devctl/devctl.c	(revision 9ab27144f671d13ed76e2e885acabcdcd64ce303)
+++ uspace/app/devctl/devctl.c	(revision ce1df04f4ef772bb19ef81b2f55e1f9c3359319f)
@@ -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;
 	}