diff -Naur xf86-input-wacom-0.10.3/src/wcmUSB.c xf86-input-wacom-0.10.3-patched/src/wcmUSB.c
--- xf86-input-wacom-0.10.3/src/wcmUSB.c	2009-12-24 07:00:50.000000000 +0800
+++ xf86-input-wacom-0.10.3-patched/src/wcmUSB.c	2009-12-28 17:35:42.000000000 +0800
@@ -523,7 +523,7 @@
 	}
 
 	/* vendor is wacom */
-	if (sID.vendor == WACOM_VENDOR_ID)
+	if (WACOM_VENDOR_ID(sID.vendor))
 	{
 		common->tablet_id = sID.product;
 
@@ -756,7 +756,7 @@
 		else
 			channel = 0;
 	}
-	else if (serial) /* serial number should never be 0 for V5 devices */
+	else
 	{
 		/* dual input is supported */
 		if ( strstr(common->wcmModel->name, "Intuos1") ||
@@ -849,15 +849,6 @@
 
 	if ((event->type == EV_MSC) && (event->code == MSC_SERIAL))
 	{
-		/* we don't report serial numbers for some tools
-		 * but we never report a serial number with a value of 0 */
-		if (event->value == 0)
-		{
-			xf86Msg(X_ERROR, "%s: usbParse: Ignoring event from invalid serial 0\n",
-				local->name);
-			goto skipEvent;
-		}
-
 		/* save the serial number so we can look up the channel number later */
 		common->wcmLastToolSerial = event->value;
 
diff -Naur xf86-input-wacom-0.10.3/src/xf86Wacom.c xf86-input-wacom-0.10.3-patched/src/xf86Wacom.c
--- xf86-input-wacom-0.10.3/src/xf86Wacom.c	2009-12-24 07:01:05.000000000 +0800
+++ xf86-input-wacom-0.10.3-patched/src/xf86Wacom.c	2009-12-28 17:17:17.000000000 +0800
@@ -904,7 +904,7 @@
 
 	SYSCALL(close(fd));
 
-	if (id.vendor == WACOM_VENDOR_ID)
+	if (WACOM_VENDOR_ID(id.vendor))
 		return TRUE;
 	else
 		return FALSE;
diff -Naur xf86-input-wacom-0.10.3/src/xf86WacomDefs.h xf86-input-wacom-0.10.3-patched/src/xf86WacomDefs.h
--- xf86-input-wacom-0.10.3/src/xf86WacomDefs.h	2009-12-24 07:01:05.000000000 +0800
+++ xf86-input-wacom-0.10.3-patched/src/xf86WacomDefs.h	2009-12-28 17:24:39.000000000 +0800
@@ -26,8 +26,9 @@
 #include <asm/types.h>
 #include <linux/input.h>
 #define MAX_USB_EVENTS 32
-#define WACOM_VENDOR_ID 0x056a  /* vendor ID on the kernel device */
-
+#define WACOM_VENDOR_ID(id) /*vendor ID on the kernel device*/ \
+	id == 0x056a  || /* Wacom */ \
+	id == 0x172f /* Waltop */
 #define DEFAULT_SUPPRESS 2      /* default suppress */
 #define MAX_SUPPRESS 100        /* max value of suppress */
 #define BUFFER_SIZE 256         /* size of reception buffer */