diff --git a/src/device/mouse.c b/src/device/mouse.c
index 5250e5125..ae68353fc 100644
--- a/src/device/mouse.c
+++ b/src/device/mouse.c
@@ -168,7 +168,11 @@ mouse_clear_buttons(void)
 static double
 mouse_scale_coord_x(double x, int mul)
 {
-    double ratio = (double) monitors[0].mon_unscaled_size_x / (double) monitors[0].mon_res_x;
+    double ratio = 1.0;
+
+    if (!mouse_raw)        
+        ratio = (monitors[0].mon_res_x * plat_get_dpi())/
+                ((double) monitors[0].mon_unscaled_size_x);
 
     if (mul)
         x *= ratio;
@@ -181,7 +185,11 @@ mouse_scale_coord_x(double x, int mul)
 static double
 mouse_scale_coord_y(double y, int mul)
 {
-    double ratio = (double) monitors[0].mon_efscrnsz_y / (double) monitors[0].mon_res_y;
+    double ratio = 1.0;
+
+    if (!mouse_raw)        
+        ratio = (monitors[0].mon_res_y * plat_get_dpi()) /
+                ((double) monitors[0].mon_efscrnsz_y);
 
     if (mul)
         y *= ratio;
@@ -386,6 +394,8 @@ mouse_scale_y(int y)
 void
 mouse_scale(int x, int y)
 {
+    pclog("DPI = %lf (%lfx%lf)\n", plat_get_dpi(), monitors[0].mon_res_x, monitors[0].mon_res_y);
+
     mouse_scale_x(x);
     mouse_scale_y(y);
 }
diff --git a/src/device/mouse_ps2.c b/src/device/mouse_ps2.c
index 2d0f3c85d..251459199 100644
--- a/src/device/mouse_ps2.c
+++ b/src/device/mouse_ps2.c
@@ -84,7 +84,7 @@ ps2_report_coordinates(atkbc_dev_t *dev, int main)
 
     mouse_subtract_coords(&delta_x, &delta_y, &overflow_x, &overflow_y,
                           -256, 255, 1, 0);
-    mouse_subtract_z(&delta_z, -8, 7, 1);
+    mouse_subtract_z(&delta_z, -8, 7, 0);
 
     buff[0] |= (overflow_y << 7) | (overflow_x << 6) |
               ((delta_y & 0x0100) >> 3) | ((delta_x & 0x0100) >> 4) |
diff --git a/src/device/mouse_serial.c b/src/device/mouse_serial.c
index 0939bf875..91fdd498a 100644
--- a/src/device/mouse_serial.c
+++ b/src/device/mouse_serial.c
@@ -279,7 +279,7 @@ sermouse_report_ms(mouse_t *dev)
     int b = mouse_get_buttons_ex();
 
     mouse_subtract_coords(&delta_x, &delta_y, NULL, NULL, -128, 127, 0, 0);
-    mouse_subtract_z(&delta_z, -8, 7, 1);
+    mouse_subtract_z(&delta_z, -8, 7, 0);
 
     dev->buf[0] = 0x40;
     dev->buf[0] |= (((delta_y >> 6) & 0x03) << 2);