From c3529d353d4d23c655e74d4c4ae97c925ed25291 Mon Sep 17 00:00:00 2001
From: Lorenz Meier <lm@inf.ethz.ch>
Date: Mon, 15 Feb 2016 12:43:11 +0100
Subject: [PATCH] sensors: Do not change parameter if it already has the right
 default

---
 src/modules/sensors/sensors.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/modules/sensors/sensors.cpp b/src/modules/sensors/sensors.cpp
index d54ee6e0bd..954df4e3d9 100644
--- a/src/modules/sensors/sensors.cpp
+++ b/src/modules/sensors/sensors.cpp
@@ -1503,8 +1503,12 @@ Sensors::parameter_update_poll(bool forced)
 						/* mag is internal */
 						_mag_rotation[s] = _board_rotation;
 						/* reset param to -1 to indicate internal mag */
-						int32_t minus_one = MAG_ROT_VAL_INTERNAL;
-						param_set_no_notification(param_find(str), &minus_one);
+						int32_t minus_one;
+						param_get(param_find(str), &minus_one);
+						if (minus_one != MAG_ROT_VAL_INTERNAL) {
+							minus_one = MAG_ROT_VAL_INTERNAL;
+							param_set_no_notification(param_find(str), &minus_one);
+						}
 
 					} else {