diff -Nur vdr-graphlcd-pre-0.2.0-skinning-branch_rev278/display.c vdr-graphlcd-pre-0.2.0-skinning-branch_rev278wa/display.c
--- vdr-graphlcd-pre-0.2.0-skinning-branch_rev278/display.c	2009-06-30 00:28:06.000000000 +0200
+++ vdr-graphlcd-pre-0.2.0-skinning-branch_rev278wa/display.c	2009-06-30 00:51:57.000000000 +0200
@@ -44,6 +44,10 @@
     mLastState = StateNormal;
 
     mShowVolume = false;
+
+    nCurrentBrightness = -1;
+    LastTimeBrightness = 0;
+    bBrightnessActive = true;
 }
 
 cGraphLCDDisplay::~cGraphLCDDisplay()
@@ -173,6 +177,13 @@
                 mUpdate = true;
             }
 
+            // update display if BrightnessDelay is exceeded
+            if ((nCurrentBrightness == GraphLCDSetup.BrightnessActive) && 
+                ((cTimeMs::Now() - LastTimeBrightness) > (uint64_t) (GraphLCDSetup.BrightnessDelay*1000))) 
+            {
+                mUpdate = true;
+            }
+
             if (mUpdate)
             {
                 mUpdateAt = 0;
@@ -206,6 +217,7 @@
                 mLcd->SetScreen(mScreen->Data(), mScreen->Width(), mScreen->Height(), mScreen->LineSize());
                 mLcd->Refresh(false);
                 mLastTimeMs = currTimeMs;
+                SetBrightness();
             }
             else
             {
@@ -297,3 +309,41 @@
     }
     UpdateIn(100);
 }
+
+void cGraphLCDDisplay::SetBrightness()
+{
+    //mutex.Lock();
+    bool bActive = bBrightnessActive
+                   || (mState != StateNormal)
+                   || (GraphLCDSetup.ShowVolume && mShowVolume)
+                   || (GraphLCDSetup.ShowMessages && mGraphLCDState->ShowMessage())
+                   || (GraphLCDSetup.BrightnessDelay == 900);
+    if (bActive)
+    {
+        LastTimeBrightness = cTimeMs::Now();
+        bBrightnessActive = false;
+    }
+    if ((bActive ? GraphLCDSetup.BrightnessActive : GraphLCDSetup.BrightnessIdle) != nCurrentBrightness)
+    {
+        if (bActive)
+        {
+            mLcd->SetBrightness(GraphLCDSetup.BrightnessActive);
+            nCurrentBrightness = GraphLCDSetup.BrightnessActive;
+        }
+        else
+        {
+            if (GraphLCDSetup.BrightnessDelay < 1
+                || ((cTimeMs::Now() - LastTimeBrightness) > (uint64_t) (GraphLCDSetup.BrightnessDelay*1000)))
+            {
+                mLcd->SetBrightness(GraphLCDSetup.BrightnessIdle);
+                nCurrentBrightness = GraphLCDSetup.BrightnessIdle;
+            }
+        }
+    }
+    //mutex.Unlock();
+}
+
+void cGraphLCDDisplay::ForceUpdateBrightness() {
+    bBrightnessActive = true;
+    SetBrightness();
+}
diff -Nur vdr-graphlcd-pre-0.2.0-skinning-branch_rev278/display.h vdr-graphlcd-pre-0.2.0-skinning-branch_rev278wa/display.h
--- vdr-graphlcd-pre-0.2.0-skinning-branch_rev278/display.h	2009-06-30 00:28:06.000000000 +0200
+++ vdr-graphlcd-pre-0.2.0-skinning-branch_rev278wa/display.h	2009-06-30 00:51:58.000000000 +0200
@@ -53,6 +53,8 @@
     void SetMenuCurrent();
     const GLCD::cBitmap * GetScreen() const { return mScreen; }
 
+    void ForceUpdateBrightness();
+
 protected:
     virtual void Action();
 
@@ -75,6 +77,12 @@
     bool mShowVolume;
 
     void UpdateIn(uint64_t msec);
+
+    /** set brightness depending on user activity */
+    void SetBrightness();
+    uint64_t LastTimeBrightness;
+    int nCurrentBrightness;
+    bool bBrightnessActive;
 };
 
 #endif
diff -Nur vdr-graphlcd-pre-0.2.0-skinning-branch_rev278/state.c vdr-graphlcd-pre-0.2.0-skinning-branch_rev278wa/state.c
--- vdr-graphlcd-pre-0.2.0-skinning-branch_rev278/state.c	2009-06-30 00:28:06.000000000 +0200
+++ vdr-graphlcd-pre-0.2.0-skinning-branch_rev278wa/state.c	2009-06-30 00:52:07.000000000 +0200
@@ -566,6 +566,7 @@
     //printf("graphlcd plugin: cGraphLCDState::OsdChannel %s\n", Text);
     if (GraphLCDSetup.PluginActive)
     {
+        mDisplay->ForceUpdateBrightness();
         if (Text)
             mDisplay->Update();
     }