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Index: apps/action.c
===================================================================
--- apps/action.c  (Revision 30969)
+++ apps/action.c  (Arbeitskopie)
@@ -151,6 +151,10 @@
 }
 
 #if defined(HAVE_GUI_BOOST) && defined(HAVE_ADJUSTABLE_CPU_FREQ)
+
+/* Timeout for gui boost in seconds. */
+#define GUI_BOOST_TIMEOUT (HZ)
+
 /* Helper function which is called to boost / unboost CPU. This function
  * avoids to increase boost_count with each call of gui_boost(). */
 static void gui_boost(bool want_to_boost)
@@ -168,6 +172,15 @@
         boosted = false;
     }
 }
+
+/* gui_unboost_callback() is called GUI_BOOST_TIMEOUT seconds after the 
+ * last wheel scrolling event. */
+static int gui_unboost_callback(struct timeout *tmo)
+{
+    (void)tmo;
+    gui_boost(false);
+    return 0;
+}
 #endif
 
 /*
@@ -194,7 +207,6 @@
     int ret = ACTION_UNKNOWN;
     static int last_context = CONTEXT_STD;
     
-    
     send_event(GUI_EVENT_ACTIONUPDATE, NULL);
 
     if (timeout == TIMEOUT_NOBLOCK)
@@ -205,20 +217,16 @@
         button = button_get_w_tmo(timeout);
 
 #if defined(HAVE_GUI_BOOST) && defined(HAVE_ADJUSTABLE_CPU_FREQ)
-    /* Boost the CPU in case of wheel scrolling activity in the defined contexts.
-     * Unboost the CPU after timeout. */
-    static long last_boost_tick;
+    static struct timeout gui_unboost;
+    /* Boost the CPU in case of wheel scrolling activity in the defined contexts. 
+     * Call unboost with a timeout of GUI_BOOST_TIMEOUT. */
     if ((button&(BUTTON_SCROLL_BACK|BUTTON_SCROLL_FWD)) && 
         (context == CONTEXT_STD      || context == CONTEXT_LIST ||
          context == CONTEXT_MAINMENU || context == CONTEXT_TREE))
     {
-        last_boost_tick = current_tick;
         gui_boost(true);
+        timeout_register(&gui_unboost, gui_unboost_callback, GUI_BOOST_TIMEOUT, 0);
     }
-    else if (TIME_AFTER(current_tick, last_boost_tick + HZ))
-    {
-        gui_boost(false);
-    }
 #endif
 
     /* Data from sys events can be pulled with button_get_data
Index: firmware/export/config.h
===================================================================
--- firmware/export/config.h  (Revision 30969)
+++ firmware/export/config.h  (Arbeitskopie)
@@ -983,6 +983,11 @@
 #define INCLUDE_TIMEOUT_API
 #endif /* HAVE_USB_CHARGING_ENABLE && HAVE_USBSTACK */
 
+#if defined(HAVE_GUI_BOOST) && defined(HAVE_ADJUSTABLE_CPU_FREQ)
+/* Timeout objects required if GUI boost is enabled */
+#define INCLUDE_TIMEOUT_API
+#endif /* HAVE_GUI_BOOST && HAVE_ADJUSTABLE_CPU_FREQ */
+
 #if defined(HAVE_USBSTACK) || (CONFIG_STORAGE & STORAGE_NAND)
 #define STORAGE_GET_INFO
 #endif