Index: sys/dev/vt/vt_core.c
===================================================================
--- sys/dev/vt/vt_core.c
+++ sys/dev/vt/vt_core.c
@@ -3072,9 +3072,9 @@
 				DPRINTF(5, "reset WAIT_ACQ, ");
 			return (0);
 		} else if (mode->mode == VT_PROCESS) {
-			if (!ISSIGVALID(mode->relsig) ||
-			    !ISSIGVALID(mode->acqsig) ||
-			    !ISSIGVALID(mode->frsig)) {
+			if (!(ISSIGVALID(mode->relsig) &&
+			    ISSIGVALID(mode->acqsig) &&
+			    (mode->frsig == 0 || ISSIGVALID(mode->frsig)))) {
 				DPRINTF(5, "error EINVAL\n");
 				return (EINVAL);
 			}