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How to measure a CPU temperature on Linux OS

Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=106623
Printed Date: 21 Apr 2025 at 7:16am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: How to measure a CPU temperature on Linux OS

Posted By: Yuh.K
Subject: How to measure a CPU temperature on Linux OS
Date Posted: 16 Apr 2025 at 1:49pm

Hello. Currently, I'm using "B650 Steel Legend WiFi" with Ubuntu OS.
I'd like to measure a CPU temperature (per Core). So, installed "lm_sensors", and trying to execute "sensors" command.
But it's failed to measure a CPU temperature.
I guess that sensor modules for B650 are not installed, as a result, we cannot measure CPU temp.

Does someone know what sensor module we should install to measure it on B650 with Linux OS ?
Or Is there any way to measure a CPU temperature on B650 with Linux OS ?

Replies:

Posted By: M440
Date Posted: 17 Apr 2025 at 1:43am

for my board the nct6775 module need to be loaded


lsmod | grep nct
modprobe nct6775

to load at boot up make a file in /etc/modules-load.d/ with content 'nct6775'


mm@desktop ~
> cat /etc/modules-load.d/20_nct6775.conf
------------------------------------------------------------------------
File: /etc/modules-load.d/20_nct6775.conf
-------------------------------------------------------------------------
nct6775
--------------------------------------------------------------------------
mm@desktop ~
> sensors
spd5118-i2c-6-50
Adapter: SMBus PIIX4 adapter port 0 at 0b00
temp1:        +35.5°C  (low  =  +0.0°C, high = +55.0°C)
                       (crit low =  +0.0°C, crit = +85.0°C)

nct6799-isa-0290
Adapter: ISA adapter
in0:                     1.03 V  (min =  +0.00 V, max =  +1.74 V)
in1:                     1.85 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in2:                     3.42 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in3:                     3.33 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in4:                     1.66 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in5:                     1.06 V  (min =  +0.00 V, max =  +0.00 V)
in6:                     1.18 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in7:                     3.42 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in8:                     3.30 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in9:                     1.79 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in10:                    1.22 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in11:                    1.12 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in12:                    1.02 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in13:                  896.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in14:                    1.21 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in15:                  752.00 mV (min =  +0.00 V, max =  +0.00 V)  ALARM
in16:                    1.81 V  (min =  +0.00 V, max =  +0.00 V)  ALARM
in17:                  248.00 mV (min =  +0.00 V, max =  +0.00 V)
fan1:                     0 RPM  (min =    0 RPM)
fan2:                   761 RPM  (min =    0 RPM)
fan3:                     0 RPM  (min =    0 RPM)
fan4:                   531 RPM  (min =    0 RPM)
fan5:                   428 RPM  (min =    0 RPM)
fan7:                   492 RPM  (min =    0 RPM)
SYSTIN:                 +39.0°C  (high = +80.0°C, hyst = +75.0°C)
                                 (crit = +127.0°C)  sensor = thermistor
CPUTIN:                 +36.0°C  (high = +80.0°C, hyst = +75.0°C)
                                 (crit = +80.0°C)  sensor = thermistor
AUXTIN0:                +16.0°C  (high = +127.0°C, hyst = +110.0°C)
                                 (crit =  +0.0°C)  sensor = thermistor
AUXTIN1:                +15.0°C  (high = +80.0°C, hyst = +75.0°C)
                                 (crit = +80.0°C)  sensor = thermistor
AUXTIN2:                +19.0°C  (high = +80.0°C, hyst = +75.0°C)
                                 (crit = +80.0°C)  sensor = thermistor
AUXTIN3:                +15.0°C  (high = +80.0°C, hyst = +75.0°C)
                                 (crit = +100.0°C)  sensor = thermistor
SMBUSMASTER 0:          +46.5°C  (high = +80.0°C, hyst = +75.0°C)
AUXTIN4:                +23.0°C  (high = +80.0°C, hyst = +75.0°C)
                                 (crit = +80.0°C)
AUXTIN5:                +99.0°C
PCH_CHIP_CPU_MAX_TEMP:   +0.0°C
PCH_CHIP_TEMP:           +0.0°C
PCH_CPU_TEMP:            +0.0°C
TSI0_TEMP:              +46.6°C
intrusion0:            ALARM
intrusion1:            ALARM
beep_enable:           disabled

nvme-pci-0f00
Adapter: PCI adapter
Composite:    +38.9°C  (low  = -20.1°C, high = +83.8°C)
                       (crit = +88.8°C)
Sensor 2:     +76.8°C

k10temp-pci-00c3
Adapter: PCI adapter
Tctl:         +46.6°C
Tccd1:        +37.0°C

nvme-pci-0200
Adapter: PCI adapter
Composite:    +39.9°C  (low  =  -0.1°C, high = +82.8°C)
                       (crit = +89.8°C)

mm@desktop ~
> fan2go detect
> spd5118
  Sensors  Index  Label                       Value
           1      hwmon4/temp1 (temp1_input)  35500

> nct6799-isa-0290
  Fans     Index  Channel  Label        RPM  PWM  Auto
           1      1        hwmon2/fan1  0    77   false
           2      2        hwmon2/fan2  758  81   false
           3      3        hwmon2/fan3  0    0    true
           4      4        hwmon2/fan4  532  67   true
           5      5        hwmon2/fan5  428  67   true
           6      7        hwmon2/fan7  492  67   true
  Sensors  Index  Label                                 Value
           1      SYSTIN (temp1_input)                  39000
           2      CPUTIN (temp2_input)                  36000
           3      AUXTIN0 (temp3_input)                 16000
           4      AUXTIN1 (temp4_input)                 15000
           5      AUXTIN2 (temp5_input)                 19000
           6      AUXTIN3 (temp6_input)                 15000
           7      SMBUSMASTER 0 (temp7_input)           46500
           8      AUXTIN4 (temp8_input)                 23000
           9      AUXTIN5 (temp9_input)                 99000
           10     PCH_CHIP_CPU_MAX_TEMP (temp10_input)  0
           11     PCH_CHIP_TEMP (temp11_input)          0
           12     PCH_CPU_TEMP (temp12_input)           0
           13     TSI0_TEMP (temp13_input)              46625

> nvme-pci-0f00
  Sensors  Index  Label                    Value
           1      Composite (temp1_input)  38850
           2      Sensor 2 (temp3_input)   76850

> k10temp-pci-00c3
  Sensors  Index  Label                Value
           1      Tctl (temp1_input)   46625
           2      Tccd1 (temp3_input)  37500

> nvme-pci-0200
  Sensors  Index  Label                    Value
           1      Composite (temp1_input)  39850

mm@desktop ~
>

-------------
asrock b650m/hdv.m2, ryzen 7700x@85watt

Posted By: Yuh.K
Date Posted: 17 Apr 2025 at 1:22pm

Thank you for your support.

As you mentioned, nct6775 is not loaded on my environment.
I'm trying to load nct6775, but facing the problem of modprobe/make. So Currently, analyzing this matter.

=========
# modprobe nct6775
modprobe: ERROR: could not insert 'nct6775': No such device

# git clone https://github.com/killghost/nct6775" rel="nofollow - https://github.com/killghost/nct6775
Cloning into 'nct6775'...
remote: Enumerating objects: 281, done.
remote: Total 281 (delta 0), reused 0 (delta 0), pack-reused 281 (from 1)
Receiving objects: 100% (281/281), 150.95 KiB | 13.72 MiB/s, done.
Resolving deltas: 100% (162/162), done.
#

# make
CC [M] /etc/netplan/nct6775/nct6775.o
In file included from /etc/netplan/nct6775/nct6775.c:61:
/etc/netplan/nct6775/nct6775.c: In function 'store_in_reg':
/etc/netplan/nct6775/compat.h:20:18: error: implicit declaration of function 'strict_strtoul' [-Werror=implicit-function-declaration]
   20 | #define kstrtoul strict_strtoul
      |                  ^~~~~~~~~~~~~~
/etc/netplan/nct6775/nct6775.c:1514:12: note: in expansion of macro 'kstrtoul'
1514 | int err = kstrtoul(buf, 10, &val);
      |            ^~~~~~~~
/etc/netplan/nct6775/nct6775.c: In function 'store_temp':
/etc/netplan/nct6775/compat.h:17:17: error: implicit declaration of function 'strict_strtol' [-Werror=implicit-function-declaration]
   17 | #define kstrtol strict_strtol
      |                 ^~~~~~~~~~~~~
/etc/netplan/nct6775/nct6775.c:1953:8: note: in expansion of macro 'kstrtol'
1953 | err = kstrtol(buf, 10, &val);
      |        ^~~~~~~
/etc/netplan/nct6775/nct6775.c: In function 'pwm_update_registers':
/etc/netplan/nct6775/nct6775.c:2277:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
2277 |   nct6775_write_value(data, data->REG_TARGET[nr],
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2278 |        data->target_temp[nr]);
      |        ~~~~~~~~~~~~~~~~~~~~~~
/etc/netplan/nct6775/nct6775.c:2280:2: note: here
2280 | default:
      | ^~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:297: /etc/netplan/nct6775/nct6775.o] Error 1
make[1]: *** [Makefile:1910: /etc/netplan/nct6775] Error 2
make: *** [Makefile:29: modules] Error 2
#
========

Posted By: M440
Date Posted: 17 Apr 2025 at 1:49pm

you have a different board,

your board manual at page 14 says you have nct6686

load nct6683 module

https://docs.kernel.org/hwmon/nct6683.html

https://github.com/lm-sensors/lm-sensors/issues/499

https://ibb.co/GvjwDyYg" rel="nofollow">

-------------
asrock b650m/hdv.m2, ryzen 7700x@85watt