diff --git a/prebuilt/synaptics-rmi-touchscreen.idc b/prebuilt/synaptics-rmi-touchscreen.idc
index 71531c1..ecb2f0f 100644
--- a/prebuilt/synaptics-rmi-touchscreen.idc
+++ b/prebuilt/synaptics-rmi-touchscreen.idc
@@ -15,31 +15,16 @@
 #
 # Input Device Calibration File for the Leo touch screen.
 #
-# These calibration values are derived from empirical measurements
-# and may not be appropriate for use with other touch screens.
-# Refer to the input device calibration documentation for more details.
-#
 
+# Basic Parameters
 touch.deviceType = touchScreen
 touch.orientationAware = 1
 
-# Touch Size
-touch.touchSize.calibration = pressure
-
-# Tool Size
-# Driver reports tool size as a linear width measurement summed over
-# all contact points.
-#
-# Raw width field measures approx. 1 unit per millimeter
-# of tool size on the surface where a raw width of 1 corresponds
-# to about 17mm of physical size.  Given that the display resolution
-# is 10px per mm we obtain a scale factor of 10 pixels / unit and
-# a bias of 160 pixels.  In addition, the raw width represents a
-# sum of all contact area so we note this fact in the calibration.
-touch.toolSize.calibration = linear
-touch.toolSize.linearScale = 10
-touch.toolSize.linearBias = 160
-touch.toolSize.isSummed = 1
+# Size
+touch.size.calibration = diameter
+touch.size.scale = 10
+touch.size.bias = 0
+touch.size.isSummed = 0
 
 # Pressure
 # Driver reports signal strength as pressure.
@@ -53,11 +38,7 @@ touch.toolSize.isSummed = 1
 # a featherlight touch will be below 1.0 and a heavy or large touch
 # will be above 1.0.  We don't expect these values to be accurate.
 touch.pressure.calibration = amplitude
-touch.pressure.source = default
-touch.pressure.scale = 0.01
-
-# Size
-touch.size.calibration = normalized
+touch.pressure.scale = 0.005
 
 # Orientation
 touch.orientation.calibration = none