diff --git a/tuned/plugins/plugin_cpu.py b/tuned/plugins/plugin_cpu.py
index fc6c568..f6322c7 100644
--- a/tuned/plugins/plugin_cpu.py
+++ b/tuned/plugins/plugin_cpu.py
@@ -5,6 +5,7 @@ from tuned.utils.commands import commands
 
 import os
 import struct
+import errno
 
 log = tuned.logs.get()
 
@@ -52,19 +53,19 @@ class CPULatencyPlugin(base.Plugin):
 		}
 
 	def _check_cpupower(self):
-		if self._cmd.execute(["cpupower", "frequency-info"])[0] == 0:
+		if self._cmd.execute(["cpupower", "frequency-info"], no_errors = [errno.ENOENT])[0] == 0:
 			self._has_cpupower = True
 		else:
 			self._has_cpupower = False
-			log.warning("using sysfs fallback, is cpupower installed?")
+			log.warning("unable to run cpupower tool, using sysfs fallback, is cpupower installed?")
 
 	def _check_energy_perf_bias(self):
 		self._has_energy_perf_bias = False
-		retcode = self._cmd.execute(["x86_energy_perf_policy", "-r"])[0]
+		retcode = self._cmd.execute(["x86_energy_perf_policy", "-r"], no_errors = [errno.ENOENT])[0]
 		if retcode == 0:
 			self._has_energy_perf_bias = True
 		elif retcode == -1:
-			log.warning("error executing x86_energy_perf_policy tool, ignoring CPU energy performance bias, is the tool installed?")
+			log.warning("unable to run x86_energy_perf_policy tool, ignoring CPU energy performance bias, is the tool installed?")
 		else:
 			log.warning("your CPU doesn't support MSR_IA32_ENERGY_PERF_BIAS, ignoring CPU energy performance bias")