From c776fcd4e1ed5daac6c310c7262a889ec03277ed Mon Sep 17 00:00:00 2001
From: wulf <wulf@FreeBSD.org>
Date: Thu, 19 Oct 2017 21:07:28 +0000
Subject: [PATCH] psm(4): Add sanity checks to Synaptics touchpad driver
 resolution parser.

This fixes "Kernel has only x or y resolution, not both" libinput error.

Reported by:	Ivan <bsd@abinet.ru>
Tested by:	Ivan <bsd@abinet.ru>
Approved by:	gonzo (mentor)
MFC after:	2 weeks
---
 sys/dev/atkbdc/psm.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/dev/atkbdc/psm.c b/sys/dev/atkbdc/psm.c
index c077a68190e9..608e4c58f0f0 100644
--- a/sys/dev/atkbdc/psm.c
+++ b/sys/dev/atkbdc/psm.c
@@ -6094,8 +6094,10 @@ enable_synaptics(struct psm_softc *sc, enum probearg arg)
 		if (get_mouse_status(kbdc, status, 0, 3) != 3)
 			return (FALSE);
 
-		synhw.infoXupmm = status[0];
-		synhw.infoYupmm = status[2];
+		if (status[0] != 0 && (status[1] & 0x80) && status[2] != 0) {
+			synhw.infoXupmm = status[0];
+			synhw.infoYupmm = status[2];
+		}
 
 		if (verbose >= 2) {
 			printf("  Extended capabilities:\n");