Install

Install

yum install lm-sensors

## 'yum' above for CentOS, 'apt-get' if you are using Ubuntu

sensors-detect
sensors

## if sensors-detect does not work, and above lm-sensors command does says 'nothing to do', try below instead

yum install lm_sensors.x86_64

Example

[root@rdlab ~]# sensors
coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +42.0°C  (high = +80.0°C, crit = +90.0°C)
Core 0:         +33.0°C  (high = +80.0°C, crit = +90.0°C)
Core 1:         +35.0°C  (high = +80.0°C, crit = +90.0°C)
Core 2:         +36.0°C  (high = +80.0°C, crit = +90.0°C)
Core 3:         +30.0°C  (high = +80.0°C, crit = +90.0°C)
Core 4:         +33.0°C  (high = +80.0°C, crit = +90.0°C)
Core 5:         +32.0°C  (high = +80.0°C, crit = +90.0°C)

Monitoring 'sensors'

Example

watch -n 1 -d sensors

## continuously prints and highlights changes

k10temp-pci-00c3 (on Ubuntu 20.04)

This sensor is provided by the k10temp kernel module which handles the AMD CPU.

Example of customer output

iwlwifi_1-virtual-0
Adapter: Virtual device
temp1: +67.0°C

enp68s0-pci-4400
Adapter: PCI adapter
PHY Temperature: +84.0°C

k10temp-pci-00c3
Adapter: PCI adapter
Tdie: +93.0°C (high = +70.0°C)
Tctl: +93.0°C

## ^ this is pretty hot

Known-oddities with lm_sensors

It doesn't work well with CentOS 8.x. It only does one sensor, but it is not clear on what that sensor tracks.

groans

What happens if you run 'sensors' without running 'sensors-detect'

sensors (without 'sensors-detect')

exx@rdlab:~$ sensors
iwlwifi_1-virtual-0 <Wi-Fi adapter>
Adapter: Virtual device
temp1: +32.0°C

enp69s0-pci-4500 <Seems exclusive to TRX40>
Adapter: PCI adapter
PHY Temperature: +63.3°C

k10temp-pci-00c3 <Tdie, which is true CPU temperature; Tctl is the mirrored offset that triggers fan RPM's to increase/decrease>
Adapter: PCI adapter
Tdie: +40.1°C (high = +70.0°C)
Tctl: +40.1°C

Running 'sensors-detect'

Warning, you are going to need to manually type in 'y' for about 20-30 sensors

exx@rdlab:~$ sensors-detect
You need to be root to run this script.
exx@rdlab:~$ sudo bash
[sudo] password for exx:
exx@rdlab:~$ sudo bash
[sudo] password for exx:
root@rdlab:/home/exx# sensors-detect
# sensors-detect version 3.6.0
# Board: ASRock TRX40 Creator
# Kernel: 5.4.0-80-generic x86_64
# Processor: AMD Ryzen Threadripper 3960X 24-Core Processor (23/49/0)

This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.

Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no): Y

If you really want to see ALL of the sensors being detected

The many sensors that is being detected

root@rdlab:/home/exx# sensors-detect
# sensors-detect version 3.6.0
# Board: ASRock TRX40 Creator
# Kernel: 5.4.0-80-generic x86_64
# Processor: AMD Ryzen Threadripper 3960X 24-Core Processor (23/49/0)

This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.

Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no): ^C
root@rdlab:/home/exx# sensors-detect
# sensors-detect version 3.6.0
# Board: ASRock TRX40 Creator
# Kernel: 5.4.0-80-generic x86_64
# Processor: AMD Ryzen Threadripper 3960X 24-Core Processor (23/49/0)

This program will help you determine which kernel modules you need
to load to use lm_sensors most effectively. It is generally safe
and recommended to accept the default answers to all questions,
unless you know what you're doing.

Some south bridges, CPUs or memory controllers contain embedded sensors.
Do you want to scan for them? This is totally safe. (YES/no): Y
Module cpuid loaded successfully.
Silicon Integrated Systems SIS5595...                       No
VIA VT82C686 Integrated Sensors...                          No
VIA VT8231 Integrated Sensors...                            No
AMD K8 thermal sensors...                                   No
AMD Family 10h thermal sensors...                           No
AMD Family 11h thermal sensors...                           No
AMD Family 12h and 14h thermal sensors...                   No
AMD Family 15h thermal sensors...                           No
AMD Family 16h thermal sensors...                           No
AMD Family 17h thermal sensors...                           Success!
    (driver `k10temp')
AMD Family 15h power sensors...                             No
AMD Family 16h power sensors...                             No
Hygon Family 18h thermal sensors...                         No
Intel digital thermal sensor...                             No
Intel AMB FB-DIMM thermal sensor...                         No
Intel 5500/5520/X58 thermal sensor...                       No
VIA C7 thermal sensor...                                    No
VIA Nano thermal sensor...                                  No

Some Super I/O chips contain embedded sensors. We have to write to
standard I/O ports to probe them. This is usually safe.
Do you want to scan for Super I/O sensors? (YES/no): y
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               Yes
Found `Nuvoton NCT6683D eSIO'                               Success!
    (address 0xa20, driver `nct6683')
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor/ITE'...               No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      No

Some systems (mainly servers) implement IPMI, a set of common interfaces
through which system health data may be retrieved, amongst other things.
We first try to get the information from SMBIOS. If we don't find it
there, we have to read from arbitrary I/O ports to probe for such
interfaces. This is normally safe. Do you want to scan for IPMI
interfaces? (YES/no): y
Probing for `IPMI BMC KCS' at 0xca0...                      No
Probing for `IPMI BMC SMIC' at 0xca8...                     No

Some hardware monitoring chips are accessible through the ISA I/O ports.
We have to write to arbitrary I/O ports to probe them. This is usually
safe though. Yes, you do have ISA I/O ports even if you do not have any
ISA slots! Do you want to scan the ISA I/O ports? (yes/NO): y
Probing for `National Semiconductor LM78' at 0x290...       No
Probing for `National Semiconductor LM79' at 0x290...       No
Probing for `Winbond W83781D' at 0x290...                   No
Probing for `Winbond W83782D' at 0x290...                   No

Lastly, we can probe the I2C/SMBus adapters for connected hardware
monitoring devices. This is the most risky part, and while it works
reasonably well on most systems, it has been reported to cause trouble
on some systems.
Do you want to probe the I2C/SMBus adapters now? (YES/no): y
Using driver `i2c-piix4' for device 0000:00:14.0: AMD KERNCZ SMBus

Next adapter: Synopsys DesignWare I2C adapter (i2c-0)
Do you want to scan it? (YES/no/selectively): y
Adapter doesn't support all probing functions.
Some addresses won't be probed.
y

Next adapter: SMBus PIIX4 adapter port 0 at 0b00 (i2c-1)
Do you want to scan it? (yes/NO/selectively): Client found at address 0x28
Probing for `National Semiconductor LM78'...                No
Probing for `National Semiconductor LM79'...                No
Probing for `National Semiconductor LM80'...                No
Probing for `National Semiconductor LM96080'...             No
Probing for `Winbond W83781D'...                            No
Probing for `Winbond W83782D'...                            No
Probing for `Nuvoton NCT7802Y'...                           No
Probing for `Winbond W83627HF'...                           No
Probing for `Winbond W83627EHF'...                          No
Probing for `Winbond W83627DHG/W83667HG/W83677HG'...        No
Probing for `Asus AS99127F (rev.1)'...                      No
Probing for `Asus AS99127F (rev.2)'...                      No
Probing for `Asus ASB100 Bach'...                           No
Probing for `Analog Devices ADM1029'...                     No
Probing for `ITE IT8712F'...                                No
Client found at address 0x51
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 Yes
    (confidence 8, not a hardware monitoring chip)
Client found at address 0x53
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 Yes
    (confidence 8, not a hardware monitoring chip)

Next adapter: SMBus PIIX4 adapter port 2 at 0b00 (i2c-2)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: SMBus PIIX4 adapter port 1 at 0b20 (i2c-3)
Do you want to scan it? (yes/NO/selectively): y
Client found at address 0x2a
Probing for `National Semiconductor LM78'...                No
Probing for `National Semiconductor LM79'...                No
Probing for `National Semiconductor LM80'...                No
Probing for `National Semiconductor LM96080'...             No
Probing for `Winbond W83781D'...                            No
Probing for `Winbond W83782D'...                            No
Probing for `Nuvoton NCT7802Y'...                           No
Probing for `Winbond W83627HF'...                           No
Probing for `Winbond W83627EHF'...                          No
Probing for `Winbond W83627DHG/W83667HG/W83677HG'...        No
Probing for `Asus AS99127F (rev.1)'...                      No
Probing for `Asus AS99127F (rev.2)'...                      No
Probing for `Asus ASB100 Bach'...                           No
Probing for `Analog Devices ADM1021'...                     No
Probing for `Analog Devices ADM1021A/ADM1023'...            No
Probing for `Maxim MAX1617'...                              No
Probing for `Maxim MAX1617A'...                             No
Probing for `Maxim MAX1668'...                              No
Probing for `Maxim MAX1805'...                              No
Probing for `Maxim MAX1989'...                              No
Probing for `Maxim MAX6655/MAX6656'...                      No
Probing for `TI THMC10'...                                  No
Probing for `National Semiconductor LM84'...                No
Probing for `Genesys Logic GL523SM'...                      No
Probing for `Onsemi MC1066'...                              No
Probing for `Maxim MAX1618'...                              No
Probing for `Maxim MAX1619'...                              No
Probing for `National Semiconductor LM82/LM83'...           Success!
    (confidence 6, driver `lm83')
Probing for `Maxim MAX6654'...                              No
Probing for `Maxim MAX6690'...                              No
Probing for `Maxim MAX6680/MAX6681'...                      No
Probing for `Maxim MAX6695/MAX6696'...                      No
Probing for `Texas Instruments TMP400'...                   No
Probing for `Texas Instruments TMP421'...                   No
Probing for `Texas Instruments TMP441'...                   No
Probing for `National Semiconductor LM95231'...             No
Probing for `National Semiconductor LM95233'...             No
Probing for `National Semiconductor LM95241'...             No
Probing for `Analog Devices ADM1029'...                     No
Probing for `ITE IT8712F'...                                No
Client found at address 0x4f
Probing for `National Semiconductor LM75'...                No
Probing for `National Semiconductor LM75A'...               No
Probing for `Dallas Semiconductor DS75'...                  No
Probing for `Maxim MAX6642'...                              No
Probing for `Texas Instruments TMP421'...                   No
Probing for `Texas Instruments TMP422'...                   No
Probing for `Texas Instruments TMP435'...                   No
Probing for `Texas Instruments TMP441'...                   No
Probing for `Maxim MAX6633/MAX6634/MAX6635'...              No
Probing for `NXP/Philips SA56004'...                        No

Next adapter: NVIDIA i2c adapter 1 at 1:00.0 (i2c-4)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 2 at 1:00.0 (i2c-5)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 5 at 1:00.0 (i2c-6)
Do you want to scan it? (yes/NO/selectively): y
Client found at address 0x4a
Probing for `National Semiconductor LM75'...                No
Probing for `National Semiconductor LM75A'...               No
Probing for `Dallas Semiconductor DS75'...                  No
Probing for `National Semiconductor LM77'...                No
Probing for `Analog Devices ADT7410/ADT7420'...             No
Probing for `Analog Devices ADT7411'...                     No
Probing for `Maxim MAX6642'...                              No
Probing for `Texas Instruments TMP435'...                   No
Probing for `National Semiconductor LM73'...                No
Probing for `National Semiconductor LM92'...                No
Probing for `National Semiconductor LM76'...                No
Probing for `Maxim MAX6633/MAX6634/MAX6635'...              No
Probing for `NXP/Philips SA56004'...                        No
Client found at address 0x4b
Probing for `National Semiconductor LM75'...                No
Probing for `National Semiconductor LM75A'...               No
Probing for `Dallas Semiconductor DS75'...                  No
Probing for `National Semiconductor LM77'...                No
Probing for `Analog Devices ADT7410/ADT7420'...             No
Probing for `Analog Devices ADT7411'...                     No
Probing for `Maxim MAX6642'...                              No
Probing for `Texas Instruments TMP435'...                   No
Probing for `National Semiconductor LM92'...                No
Probing for `National Semiconductor LM76'...                No
Probing for `Maxim MAX6633/MAX6634/MAX6635'...              No
Probing for `NXP/Philips SA56004'...                        No
Probing for `Analog Devices ADT7481'...                     No

Next adapter: NVIDIA i2c adapter 6 at 1:00.0 (i2c-7)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 7 at 1:00.0 (i2c-8)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 8 at 1:00.0 (i2c-9)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 1 at 21:00.0 (i2c-10)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 2 at 21:00.0 (i2c-11)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 5 at 21:00.0 (i2c-12)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 6 at 21:00.0 (i2c-13)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 7 at 21:00.0 (i2c-14)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 8 at 21:00.0 (i2c-15)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 1 at 4b:00.0 (i2c-16)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 2 at 4b:00.0 (i2c-17)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 5 at 4b:00.0 (i2c-18)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 6 at 4b:00.0 (i2c-19)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 7 at 4b:00.0 (i2c-20)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 8 at 4b:00.0 (i2c-21)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 1 at 4c:00.0 (i2c-22)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 2 at 4c:00.0 (i2c-23)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 5 at 4c:00.0 (i2c-24)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 6 at 4c:00.0 (i2c-25)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 7 at 4c:00.0 (i2c-26)
Do you want to scan it? (yes/NO/selectively): y

Next adapter: NVIDIA i2c adapter 8 at 4c:00.0 (i2c-27)
Do you want to scan it? (yes/NO/selectively): y


Now follows a summary of the probes I have just done.
Just press ENTER to continue:

Driver `nct6683':
  * ISA bus, address 0xa20
    Chip `Nuvoton NCT6683D eSIO' (confidence: 9)

Driver `lm83':
  * Bus `SMBus PIIX4 adapter port 1 at 0b20'
    Busdriver `i2c_piix4', I2C address 0x2a
    Chip `National Semiconductor LM82/LM83' (confidence: 6)

Driver `k10temp' (autoloaded):
  * Chip `AMD Family 17h thermal sensors' (confidence: 9)

To load everything that is needed, add this to /etc/modules:
#----cut here----
# Chip drivers
lm83
nct6683
#----cut here----
If you have some drivers built into your kernel, the list above will
contain too many modules. Skip the appropriate ones!

Do you want to add these lines automatically to /etc/modules? (yes/NO)y
Successful!

Monitoring programs won't work until the needed modules are
loaded. You may want to run '/etc/init.d/kmod start'
to load them.

Unloading cpuid... OK

root@rdlab:/home/exx#

lm-sensors