diff --git a/firmware/backlight.c b/firmware/backlight.c
index b3fa5afb6a..6f7432c9e2 100644
--- a/firmware/backlight.c
+++ b/firmware/backlight.c
@@ -303,7 +303,7 @@ static void backlight_dim(int value)
     if (bl_timer_active)
         return ;
 
-    if (timer_register(0, backlight_release_timer, 1, 0, backlight_isr))
+    if (timer_register(0, backlight_release_timer, 2, 0, backlight_isr))
     {
 #ifdef CPU_COLDFIRE
         /* Prevent cpu frequency changes while dimming. */
diff --git a/firmware/timer.c b/firmware/timer.c
index 8523805890..84d0359008 100644
--- a/firmware/timer.c
+++ b/firmware/timer.c
@@ -60,7 +60,7 @@ void TIMER2(void)
     }
     if (pfn_timer != NULL)
     {
-        cycles_new = -1; 
+        cycles_new = -1;
         /* "lock" the variable, in case timer_set_period()
          * is called within pfn_timer() */
         pfn_timer();
@@ -151,7 +151,7 @@ static bool timer_set(long cycles, bool start)
         TCN1 = 0; /* reset the timer */
     TER1 = 0xff;  /* clear all events */
 #elif CONFIG_CPU == PP5020 || CONFIG_CPU == PP5002
-    if (cycles > 0x20000000)
+    if (cycles > 0x20000000 || cycles < 2)
         return false;
 
     if (start)