diff --git a/drivers/hid/hid-3m-pct.c b/drivers/hid/hid-3m-pct.c
index 2a0d56b..1057430 100644
--- a/drivers/hid/hid-3m-pct.c
+++ b/drivers/hid/hid-3m-pct.c
@@ -24,6 +24,9 @@
 
 #include "hid-ids.h"
 
+#define MAX_SLOTS		60
+#define MAX_TRKID		59
+
 struct mmm_finger {
 	__s32 x, y, w, h;
 	__u8 rank;
@@ -31,8 +34,9 @@
 };
 
 struct mmm_data {
-	struct mmm_finger f[10];
+	struct mmm_finger f[MAX_SLOTS];
 	__u8 curid, num;
+	__u8 nexp, nreal;
 	bool touch, valid;
 };
 
@@ -93,7 +97,7 @@
 					1, 1, 0, 0);
 			return 1;
 		case HID_DG_CONTACTID:
-			field->logical_maximum = 59;
+			field->logical_maximum = MAX_TRKID;
 			hid_map_usage(hi, usage, bit, max,
 					EV_ABS, ABS_MT_TRACKING_ID);
 			return 1;
@@ -133,7 +137,7 @@
 	 * we need to iterate on all fingers to decide if we have a press
 	 * or a release event in our touchscreen emulation.
 	 */
-	for (i = 0; i < 10; ++i) {
+	for (i = 0; i < MAX_SLOTS; ++i) {
 		struct mmm_finger *f = &md->f[i];
 		if (!f->valid) {
 			/* this finger is just placeholder data, ignore */
@@ -190,6 +194,7 @@
 	} else if (released) {
 		input_event(input, EV_KEY, BTN_TOUCH, 0);
 	}
+	input_sync(input);
 }
 
 /*
@@ -223,10 +228,12 @@
 				md->f[md->curid].h = value;
 			break;
 		case HID_DG_CONTACTID:
+			value = clamp_val(value, 0, MAX_SLOTS - 1);
 			if (md->valid) {
 				md->curid = value;
 				md->f[value].touch = md->touch;
 				md->f[value].valid = 1;
+				md->nreal++;
 			}
 			break;
 		case HID_GD_X:
@@ -238,7 +245,12 @@
 				md->f[md->curid].y = value;
 			break;
 		case HID_DG_CONTACTCOUNT:
-			mmm_filter_event(md, input);
+			if (value)
+				md->nexp = value;
+			if (md->nreal >= md->nexp) {
+				mmm_filter_event(md, input);
+				md->nreal = 0;
+			}
 			break;
 		}
 	}
@@ -255,6 +267,8 @@
 	int ret;
 	struct mmm_data *md;
 
+	hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
+
 	md = kzalloc(sizeof(struct mmm_data), GFP_KERNEL);
 	if (!md) {
 		dev_err(&hdev->dev, "cannot allocate 3M data\n");