Write Permission error on /sys/devices/system/cpu/cpuidle/current_driver with root user.

Solution Unverified - Updated -

Issue

  • Write Permission error on /sys/devices/system/cpu/cpuidle/current_driver with root user.
  • Not able to change cpuidle driver 
# echo acpi_idle > /sys/devices/system/cpu/cpuidle/current_driver
-bash: /sys/devices/system/cpu/cpuidle/current_driver: Permission denied
  • What is the difference in feature of intel_idle and acpi_idle?
  • How can we change cpuidle driver and verify the changes?

Environment

  • Red Hat Enterprise Linux

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