The configuration file for cpupower is located in /etc/default/cpupower. The package is not required to use scaling, but is highly recommended because it provides useful command-line utilities and a systemd service to change the governor at boot. Turbostat can display the frequency, power consumption, idle status and other statistics of the modern Intel and AMD CPUs.Ĭpupower is a set of userspace utilities designed to assist with CPU frequency scaling. It can be launched from a Terminal with the command i7z or as GUI with i7z-gui. I7z is an i7 (and now i3, i5, i7, i9) CPU reporting tool for Linux. The associated systemd unit is rvice, which should be started and enabled. Dell Latitude 3420), this daemon has been reported as unlocking more performance than what would be otherwise available.

If there is a skin temperature sensor in thermal sysfs, then it tries to keep skin temperature under 45C.

If the latest drivers are not available, then the daemon will revert to x86 model specific registers and the Linux 'cpufreq subsystem' to control system cooling.īy default, it monitors CPU temperature using available CPU digital temperature sensors and maintains CPU temperature under control, before hardware takes aggressive correction action. thermald can also be used for older Intel CPUs. This daemon proactively controls thermal parameters using P-states, T-states, and the Intel power clamp driver. Thermald is a Linux daemon used to prevent the overheating of Intel CPUs. Scaling drivers interact with the CPU directly, enacting the desired frequencies that the current governor is requesting.Ī default scaling driver and governor are selected automatically, but userspace tools like cpupower, acpid, Laptop Mode Tools, or GUI tools provided for your desktop environment, may still be used for advanced configuration.Scaling governors implement the algorithms to compute the desired CPU frequency, potentially based off of the system's needs.The Linux kernel offers CPU performance scaling via the CPUFreq subsystem, which defines two layers of abstraction: Scaling can be done automatically in response to system load, adjust itself in response to ACPI events, or be manually changed by user space programs. CPU performance scaling enables the operating system to scale the CPU frequency up or down in order to save power or improve performance.

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