several fixes

governor.py

@@ -5,18 +5,22 @@ from functools import cached_property
 
 
 class Governor(AppClass):
-    def __init__(self, _config: Config, testmode: bool = False) -> None:
-        super().__init__(_config, testmode)
+    def __init__(self, _config: Config) -> None:
+        super().__init__(_config)
 
     @cached_property
     def cpufreq(self) -> cpuFreq:
-        if self.testmode:
-            self.log.info("setting up governor in testmode")
         return cpuFreq()
     
     def set_governor(self, governor_name: str) -> None:
         self.log.debug("setting governor to %s by using command self.cpufreq.set_governors(%s)", governor_name)
-        if self.testmode:
+        
+        if self._config.testmode:
             self.log.warning("application is running in testmode, governor not set")
             return None
+        
+        if governor_name not in self.cpufreq.available_governors:
+            self.log.error("governor %s not supported by cpu", governor_name)
+            return None
+        
         self.cpufreq.set_governors(governor_name)