Index: dev/dnkbd.c
===================================================================
RCS file: /cvsroot/src/sys/arch/hp300/dev/dnkbd.c,v
retrieving revision 1.7
diff -u -p -d -r1.7 dnkbd.c
--- dev/dnkbd.c	24 Apr 2014 12:10:27 -0000	1.7
+++ dev/dnkbd.c	23 Mar 2017 14:55:54 -0000
@@ -263,6 +263,7 @@ static int	dnkbd_probe(struct dnkbd_soft
 static void	dnkbd_rawrepeat(void *);
 #endif
 static int	dnkbd_send(struct dnkbd_softc *, const uint8_t *, size_t);
+static void	dnkbd_break(struct dnkbd_softc *, int);

 int
 dnkbd_match(device_t parent, cfdata_t cf, void *aux)
@@ -307,6 +308,11 @@ dnkbd_attach(device_t parent, device_t s
 	/* reset the port */
 	dnkbd_init(sc, 1200, LCR_8BITS | LCR_PEVEN | LCR_PENAB);

+	/* send break to reset keyboard state */
+	dnkbd_break(sc, 1);
+	delay(10 * 1000);
+	dnkbd_break(sc, 0);
+
 	frodo_intr_establish(parent, dnkbd_intr, sc, fa->fa_line, IPL_VM);

 	/* probe for keyboard */
@@ -869,6 +875,25 @@ dnkbd_send(struct dnkbd_softc *sc, const
 	return 0;
 }

+void
+dnkbd_break(struct dnkbd_softc *sc, int onoff)
+{
+	bus_space_tag_t bst;
+	bus_space_handle_t bsh;
+	uint8_t reg;
+
+	bst = sc->sc_bst;
+	bsh = sc->sc_bsh;
+
+	reg = bus_space_read_1(bst, bsh, com_lctl);
+	if (onoff)
+		reg |= LCR_SBREAK;
+	else
+		reg &= ~LCR_SBREAK;
+
+	bus_space_write_1(bst, bsh, com_lctl, reg);
+}
+
 int
 dnkbd_intr(void *v)
 {