diff --git a/src/intel_display.c b/src/intel_display.c
index d32224e..2ff8fd5 100644
--- a/src/intel_display.c
+++ b/src/intel_display.c
@@ -140,6 +140,9 @@ intel_output_backlight_set(xf86OutputPtr output, int level)
 	char path[BACKLIGHT_PATH_LEN], val[BACKLIGHT_VALUE_LEN];
 	int fd, len, ret;
 
+	 xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+		"[xyl] enter intel_output_backlight_set(level(=%d))\n", level);
+
 	if (level > intel_output->backlight_max)
 		level = intel_output->backlight_max;
 	if (! intel_output->backlight_iface || level < 0)
@@ -161,16 +164,24 @@ intel_output_backlight_set(xf86OutputPtr output, int level)
 			   "control failed: %s\n", path, strerror(errno));
 	}
 
+         xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                "[xyl] leave intel_output_backlight_set(level(=%d))\n", level);
+
 	close(fd);
 }
 
 static int
 intel_output_backlight_get(xf86OutputPtr output)
 {
+
 	struct intel_output *intel_output = output->driver_private;
 	char path[BACKLIGHT_PATH_LEN], val[BACKLIGHT_VALUE_LEN];
 	int fd, level;
 
+         xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                "[xyl] enter intel_output_backlight_get()\n");
+
+
 	sprintf(path, "%s/%s/actual_brightness",
 		BACKLIGHT_CLASS, intel_output->backlight_iface);
 	fd = open(path, O_RDONLY);
@@ -193,6 +204,13 @@ intel_output_backlight_get(xf86OutputPtr output)
 		level = intel_output->backlight_max;
 	if (level < 0)
 		level = -1;
+
+	 xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+		"[xyl] actual_brightless is %d\n", level);
+
+         xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                "[xyl] leave intel_output_backlight_get()\n");
+
 	return level;
 }
 
@@ -877,9 +895,17 @@ intel_output_dpms_backlight(xf86OutputPtr output, int oldmode, int mode)
 {
 	struct intel_output *intel_output = output->driver_private;
 
+	xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+		"[xyl] enter intel_output_dpms_backlight(oldmode(=%d), mode(=%d))\n", oldmode, mode);
 	if (!intel_output->backlight_iface)
-		return;
+	{
+		xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+		"[xyl] intel_output->backlight_iface == NULL and doesn't call intel_output_backlight_set()\n");
 
+		xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                "[xyl] leave intel_output_dpms_backlight(oldmode(=%d), mode(=%d))\n", oldmode, mode);
+		return;
+	}
 	if (mode == DPMSModeOn) {
 		/* If we're going from off->on we may need to turn on the backlight. */
 		if (oldmode != DPMSModeOn)
@@ -891,6 +917,8 @@ intel_output_dpms_backlight(xf86OutputPtr output, int oldmode, int mode)
 			intel_output->backlight_active_level = intel_output_backlight_get(output);
 		intel_output_backlight_set(output, 0);
 	}
+	xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+		"[xyl] leave intel_output_dpms_backlight\n");
 }
 
 static void
@@ -1103,6 +1131,9 @@ intel_output_set_property(xf86OutputPtr output, Atom property,
 	struct intel_mode *mode = intel_output->mode;
 	int i;
 
+	xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+			"[xyl] enter intel_output_set_property()\n");
+
 	if (property == backlight_atom || property == backlight_deprecated_atom) {
 		INT32 val;
 
@@ -1116,8 +1147,15 @@ intel_output_set_property(xf86OutputPtr output, Atom property,
 		if (val < 0 || val > intel_output->backlight_max)
 			return FALSE;
 
+		xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+			"[xyl] dpms_mode(%d) is %s\n", intel_output->dpms_mode, intel_output->dpms_mode==DPMSModeOn ? "ON":"OFF");
+
 		if (intel_output->dpms_mode == DPMSModeOn)
 			intel_output_backlight_set(output, val);
+
+	        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                        "[xyl] Leave intel_output_set_property()\n");
+
 		intel_output->backlight_active_level = val;
 		return TRUE;
 	}
@@ -1138,6 +1176,10 @@ intel_output_set_property(xf86OutputPtr output, Atom property,
 
 			drmModeConnectorSetProperty(mode->fd, intel_output->output_id,
 						    p->mode_prop->prop_id, (uint64_t)val);
+
+                xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                        "[xyl] Leave intel_output_set_property()\n");
+
 			return TRUE;
 		} else if (p->mode_prop->flags & DRM_MODE_PROP_ENUM) {
 			Atom	atom;
@@ -1154,9 +1196,15 @@ intel_output_set_property(xf86OutputPtr output, Atom property,
 				if (!strcmp(p->mode_prop->enums[j].name, name)) {
 					drmModeConnectorSetProperty(mode->fd, intel_output->output_id,
 								    p->mode_prop->prop_id, p->mode_prop->enums[j].value);
+                xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                        "[xyl] Leave intel_output_set_property()\n");
+
 					return TRUE;
 				}
 			}
+                xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                        "[xyl] Leave intel_output_set_property()\n");
+
 			return FALSE;
 		}
 	}
@@ -1165,14 +1213,20 @@ intel_output_set_property(xf86OutputPtr output, Atom property,
 	 * to allow the set to continue, otherwise we break setting of
 	 * common properties like EDID.
 	 */
+                xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                        "[xyl] Leave intel_output_set_property()\n");
+
 	return TRUE;
 }
 
 static Bool
 intel_output_get_property(xf86OutputPtr output, Atom property)
 {
+
 	struct intel_output *intel_output = output->driver_private;
 	int err;
+	xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+		"[xyl] enter intel_output_get_property()\n");
 
 	if (property == backlight_atom || property == backlight_deprecated_atom) {
 		INT32 val;
@@ -1193,8 +1247,13 @@ intel_output_get_property(xf86OutputPtr output, Atom property)
 			return FALSE;
 		}
 
+        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                "[xyl] leave intel_output_get_property()\n");
+ 
 		return TRUE;
 	}
+        xf86DrvMsg(output->scrn->scrnIndex, X_INFO,
+                "[xyl] leave intel_output_get_property()\n");
 
 	return FALSE;
 }