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Thu, Mar 14, 2024 9:29 pm

Checking fan speeds and temperatures in a Linux system

A user reported the sound from a Linux CentOS server was loud. I thought the noise was likely from a fan in the system. The lm_sensors package provides the capability to check central processing unit (CPU) temperatures and fan speeds for systems running a Linux operating system. I first checked to see if the package was installed and found it was installed.

$ rpm -qi lm_sensors
Name        : lm_sensors
Version     : 3.3.4
Release     : 11.el7
Architecture: x86_64
Install Date: Sat 15 Oct 2016 12:14:14 PM EDT
Group       : Applications/System
Size        : 418761
License     : LGPLv2+ and GPLv3+ and GPLv2+ and Verbatim and Public domain
Signature   : RSA/SHA256, Sat 14 Mar 2015 04:15:54 AM EDT, Key ID 24c6a8a7f4a80eb5
Source RPM  : lm_sensors-3.3.4-11.el7.src.rpm
Build Date  : Thu 05 Mar 2015 10:48:12 PM EST
Build Host  :
Relocations : (not relocatable)
Packager    : CentOS BuildSystem <>
Vendor      : CentOS
URL         :
Summary     : Hardware monitoring tools
Description :
The lm_sensors package includes a collection of modules for general SMBus
access and hardware monitoring.

I then ran the sensors command to view the CPU temperature and fan speeds. The CPU and motherboard (MB) temperatures were high and the output showed 0 RPM for the chassis fan speed, indicating either there was no sensor monitoring its speed or it had stopped rotating.

$ sensors
Adapter: ACPI interface
Vcore Voltage:      +1.28 V  (min =  +0.85 V, max =  +1.60 V)
 +3.3 Voltage:      +3.36 V  (min =  +2.97 V, max =  +3.63 V)
 +5 Voltage:        +5.17 V  (min =  +4.50 V, max =  +5.50 V)
 +12 Voltage:      +12.41 V  (min = +10.20 V, max = +13.80 V)
CPU FAN Speed:     2518 RPM  (min =    0 RPM, max = 7200 RPM)
CHASSIS FAN Speed:    0 RPM  (min =  800 RPM, max = 7200 RPM)
CPU Temperature:    +79.5°C  (high = +60.0°C, crit = +95.0°C)
MB Temperature:     +61.0°C  (high = +45.0°C, crit = +95.0°C)



  1. How to find fan speed in Linux for CPU and GPU
    By: Vivek Gite
    Last updated: February 11, 2021

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