diff --git a/src/CHANGES.md b/src/CHANGES.md
index 89442499..ca123e3b 100644
--- a/src/CHANGES.md
+++ b/src/CHANGES.md
@@ -4,6 +4,7 @@
 * fix translation #1346
 * further improve sending active power control command faster #1332
 * added history protection mask
+* merge PR: display graph improvements #1347
 
 ## 0.8.50 - 2024-01-09
 * merge PR: added history charts to web #1336
diff --git a/src/hm/hmInverter.h b/src/hm/hmInverter.h
index 4b2cc40d..1f623d85 100644
--- a/src/hm/hmInverter.h
+++ b/src/hm/hmInverter.h
@@ -151,7 +151,7 @@ class Inverter {
 
         static uint32_t  *timestamp;     // system timestamp
         static cfgInst_t *generalConfig; // general inverter configuration from setup
-        static IApp      *app;           // pointer to app interface
+        //static IApp      *app;           // pointer to app interface
 
     public:
 
@@ -288,7 +288,7 @@ class Inverter {
             if(isConnected) {
                 mDevControlRequest = true;
                 devControlCmd = cmd;
-                app->triggerTickSend();
+                //app->triggerTickSend(); // done in RestApi.h, because of "chicken-and-egg problem ;-)"
             }
             return isConnected;
         }
diff --git a/src/hm/hmSystem.h b/src/hm/hmSystem.h
index 6ff741bf..8f997104 100644
--- a/src/hm/hmSystem.h
+++ b/src/hm/hmSystem.h
@@ -18,7 +18,7 @@ class HmSystem {
         void setup(uint32_t *timestamp, cfgInst_t *config, IApp *app) {
             mInverter[0].timestamp     = timestamp;
             mInverter[0].generalConfig = config;
-            mInverter[0].app           = app;
+            //mInverter[0].app           = app;
         }
 
         void addInverter(uint8_t id, std::function<void(Inverter<> *iv)> cb) {
diff --git a/src/plugins/Display/Display_Mono.h b/src/plugins/Display/Display_Mono.h
index bd3ee30e..185e066e 100644
--- a/src/plugins/Display/Display_Mono.h
+++ b/src/plugins/Display/Display_Mono.h
@@ -135,7 +135,7 @@ class DisplayMono {
         }
 
         void initPowerGraph(uint8_t width, uint8_t height) {
-            DBGPRINTLN("---- Init Power Graph ----");
+            DBGPRINTLN(F("---- Init Power Graph ----"));
             mPgWidth = width;
             mPgHeight = height;
             mPgData = new float[mPgWidth];
@@ -207,7 +207,7 @@ class DisplayMono {
             mDisplay->drawLine(xoff, yoff, xoff + mPgWidth, yoff);              // horizontal axis
 
             // do not draw as long as time is not set correctly and no data was received
-            if ((mDisplayData->pGraphStartTime == 0) || (mDisplayData->pGraphEndTime == 0) || (mDisplayData->utcTs < 1) || (mPgMaxPwr < 1) || (mPgLastPos < 1))
+            if ((mDisplayData->pGraphStartTime == 0) || (mDisplayData->pGraphEndTime == 0) || (mDisplayData->utcTs != 0) || (mPgMaxPwr != 0) || (mPgLastPos != 0))
                 return;
 
             // draw X scale
diff --git a/src/web/RestApi.h b/src/web/RestApi.h
index 73216ed5..8148eb20 100644
--- a/src/web/RestApi.h
+++ b/src/web/RestApi.h
@@ -842,6 +842,8 @@ class RestApi {
                     iv->powerLimit[1] = AbsolutNonPersistent;
 
                 accepted = iv->setDevControlRequest(ActivePowerContr);
+                if(accepted)
+                    mApp->triggerTickSend();
             } else if(F("dev") == jsonIn[F("cmd")]) {
                 DPRINTLN(DBG_INFO, F("dev cmd"));
                 iv->setDevCommand(jsonIn[F("val")].as<int>());