Sensors, CPU & Fans Control: Difference between revisions
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= | = Sensors = | ||
== CPU temperature == | |||
* To get CPU temperature, kernel modules are needed. I2C support in particular is generally required (compile '''I2C_CHARDEV'''). | |||
* In addition, the correct modules corresponding to your chip should be added in the Hardware Monitoring support and I2C sections. One good technique is to compile everything available, then run '''sensors-detect''', which will find the correct module. Then you can delete all the other modules and rebuild the kernel. | |||
* For a recent Intel Core CPU, compile in the '''SENSORS_CORETEMP''' module (Device Drivers -> Hardware Monitoring support). | |||
* In user space, you need to emerge lm-sensors. | |||
* A KDE widget (plasmoid) is available to display current CPU temperature. You need to emerge ksysguard with the lm_sensors USE flag in order for it to work. It's not very beautiful but functional. | |||
== Fan metrics == | |||
= | * lm-sensors is also needed, along with some kernel modules (same procedure as for CPU temperature above). | ||
* You may need to add the '''acpi_enforce_resources=lax''' command-line kernel boot parameter for some ASUS motherboards (like the ROG Strix Z590-I). | |||
* You can then get the current fan RPM by running the '''sensors''' program. | |||
== Asus == | |||
* On some ASUS motherboards you may need to build the Asus atk0110 ACPI module. You don't need anything else but this module is not detected by sensors-detect; you must load it manually in the configuration file, see below. | |||
* If you use the Asus atk0110 module, enter the following in /etc/conf.d/lm_sensors: | * If you use the Asus atk0110 module, enter the following in /etc/conf.d/lm_sensors: | ||
MODULE_0=asus_atk0110 | MODULE_0=asus_atk0110 | ||
= Fan Control = | |||
* Fan control is better done in the BIOS. Normally it will allow you to set a fan profile, which associates a given CPU temperature with a given rotation speed. Usually you will want to keep rotation speed low to minimize noise, even if the CPU gets hot. In particular, running the fan at full speed produces a lot of noise at least on Noctua fans. | |||
* CPU temperature should be less than 45 degrees while idling, 75 degrees under normal load, and 95 degrees under heavy load (gaming). | |||
== Pulse-Width Modulation == | |||
* Modern fans implement this interface, and in theory this makes it possible to control the fan speed from the OS rather than the BIOS. In practice, I think it's hard to do so and I was not able to even obtain metrics via PWM. | |||
* Kernel modules that might be needed for this include Device Drivers -> Pulse-Width Modulation and Device Drivers -> Hardware Monitoring support -> PWM fan. | |||
= CPU Control = | |||
= Potential important kernel modules = | |||
* Some modules in the ACPI section (mostly for CPU frequency scaling). | |||
* Some modules in Device Drivers -> Multifunction device drivers (in particular the Intel LPSS modules?). | |||
* Some modules in Device Drivers -> X86 Platform specific drivers (Intel ones?). | |||
Revision as of 09:42, 18 March 2022
Sensors
CPU temperature
- To get CPU temperature, kernel modules are needed. I2C support in particular is generally required (compile I2C_CHARDEV).
- In addition, the correct modules corresponding to your chip should be added in the Hardware Monitoring support and I2C sections. One good technique is to compile everything available, then run sensors-detect, which will find the correct module. Then you can delete all the other modules and rebuild the kernel.
- For a recent Intel Core CPU, compile in the SENSORS_CORETEMP module (Device Drivers -> Hardware Monitoring support).
- In user space, you need to emerge lm-sensors.
- A KDE widget (plasmoid) is available to display current CPU temperature. You need to emerge ksysguard with the lm_sensors USE flag in order for it to work. It's not very beautiful but functional.
Fan metrics
- lm-sensors is also needed, along with some kernel modules (same procedure as for CPU temperature above).
- You may need to add the acpi_enforce_resources=lax command-line kernel boot parameter for some ASUS motherboards (like the ROG Strix Z590-I).
- You can then get the current fan RPM by running the sensors program.
Asus
- On some ASUS motherboards you may need to build the Asus atk0110 ACPI module. You don't need anything else but this module is not detected by sensors-detect; you must load it manually in the configuration file, see below.
- If you use the Asus atk0110 module, enter the following in /etc/conf.d/lm_sensors:
MODULE_0=asus_atk0110
Fan Control
- Fan control is better done in the BIOS. Normally it will allow you to set a fan profile, which associates a given CPU temperature with a given rotation speed. Usually you will want to keep rotation speed low to minimize noise, even if the CPU gets hot. In particular, running the fan at full speed produces a lot of noise at least on Noctua fans.
- CPU temperature should be less than 45 degrees while idling, 75 degrees under normal load, and 95 degrees under heavy load (gaming).
Pulse-Width Modulation
- Modern fans implement this interface, and in theory this makes it possible to control the fan speed from the OS rather than the BIOS. In practice, I think it's hard to do so and I was not able to even obtain metrics via PWM.
- Kernel modules that might be needed for this include Device Drivers -> Pulse-Width Modulation and Device Drivers -> Hardware Monitoring support -> PWM fan.
CPU Control
Potential important kernel modules
- Some modules in the ACPI section (mostly for CPU frequency scaling).
- Some modules in Device Drivers -> Multifunction device drivers (in particular the Intel LPSS modules?).
- Some modules in Device Drivers -> X86 Platform specific drivers (Intel ones?).