diff --git a/Xext/xcalibrate.c b/Xext/xcalibrate.c
index 97ef3dc38..3fe2bdc5c 100644
--- a/Xext/xcalibrate.c
+++ b/Xext/xcalibrate.c
@@ -164,7 +164,6 @@ ProcXCalibrateSetRawMode (ClientPtr client)
   return (client->noClientException);
 }
 
-
 static int
 SProcXCalibrateSetRawMode (ClientPtr client)
 {
@@ -178,6 +177,47 @@ SProcXCalibrateSetRawMode (ClientPtr client)
   return ProcXCalibrateSetRawMode(client);
 }
 
+static int
+ProcXCalibrateScreenToCoord (ClientPtr client)
+{
+  REQUEST(xXCalibrateScreenToCoordReq);
+  xXCalibrateScreenToCoordReply rep;
+
+  REQUEST_SIZE_MATCH (xXCalibrateScreenToCoordReq);
+
+  memset (&rep, 0, sizeof (rep));
+  rep.type = X_Reply;
+  rep.sequenceNumber = client->sequence;
+  rep.x = stuff->x;
+  rep.y = stuff->y;
+
+  KdScreenToPointerCoords(&rep.x, &rep.y);
+
+  if (client->swapped)
+    {
+      int n;
+
+      swaps (&rep.x, n);
+      swaps (&rep.y, n);
+    }
+  WriteToClient(client, sizeof (rep), (char *) &rep);
+  return (client->noClientException);
+}
+
+static int
+SProcXCalibrateScreenToCoord (ClientPtr client)
+{
+  REQUEST(xXCalibrateScreenToCoordReq);
+  int n;
+
+  REQUEST_SIZE_MATCH (xXCalibrateScreenToCoordReq);
+
+  swaps(&stuff->x, n);
+  swaps(&stuff->y, n);
+
+  return ProcXCalibrateScreenToCoord(client);
+}
+
 static void
 XCalibrateResetProc (ExtensionEntry *extEntry) 
 { 
@@ -192,6 +232,9 @@ ProcXCalibrateDispatch (ClientPtr client)
         return ProcXCalibrateQueryVersion(client);
     case X_XCalibrateRawMode:
         return ProcXCalibrateSetRawMode(client);
+    case X_XCalibrateScreenToCoord:
+        return ProcXCalibrateScreenToCoord(client);
+
     default: break;
     }
 
@@ -211,6 +254,8 @@ SProcXCalibrateDispatch (ClientPtr client)
         return SProcXCalibrateQueryVersion(client);
     case X_XCalibrateRawMode:
         return SProcXCalibrateSetRawMode(client);
+    case X_XCalibrateScreenToCoord:
+        return SProcXCalibrateScreenToCoord(client);
 
     default: break;
     }
diff --git a/hw/kdrive/src/kdrive.h b/hw/kdrive/src/kdrive.h
index 8722ba303..4e04b59f7 100644
--- a/hw/kdrive/src/kdrive.h
+++ b/hw/kdrive/src/kdrive.h
@@ -832,7 +832,10 @@ KdSetPointerMatrix (KdPointerMatrix *pointer);
 
 void
 KdComputePointerMatrix (KdPointerMatrix *pointer, Rotation randr, int width, int height);
-    
+
+void
+KdScreenToPointerCoords (int *x, int *y);
+
 void
 KdBlockHandler (int		screen,
 		pointer		blockData,
diff --git a/hw/kdrive/src/kinput.c b/hw/kdrive/src/kinput.c
index 6c247c185..df73942e7 100644
--- a/hw/kdrive/src/kinput.c
+++ b/hw/kdrive/src/kinput.c
@@ -631,6 +631,18 @@ KdComputePointerMatrix (KdPointerMatrix *m, Rotation randr, int width,
     }
 }
 
+void
+KdScreenToPointerCoords (int *x, int *y)
+{
+    int	(*m)[3] = kdPointerMatrix.matrix;
+    int div = m[0][1] * m[1][0] - m[1][1] * m[0][0];
+    int sx = *x;
+    int sy = *y;
+
+    *x = (m[0][1] * sy - m[0][1] * m[1][2] + m[1][1] * m[0][2] - m[1][1] * sx) / div;
+    *y = (m[1][0] * sx + m[0][0] * m[1][2] - m[1][0] * m[0][2] - m[0][0] * sy) / div;
+}
+
 static void
 KdKbdCtrl (DeviceIntPtr pDevice, KeybdCtrl *ctrl)
 {