Monitoring CPU temp on Fedora

recently found the need to monitor CPU temp on a Fedora 16 install.

$ sudo yum install lm_sensors

Once installed we need to configure lm_sensors. Run the command

$ sudo sensors-detect

You will be prompted with questions, accepting the defaults will work

$ sudo sensors-detect
# sensors-detect revision 5946 (2011-03-23 11:54:44 +0100)
# System: Gigabyte Technology Co., Ltd. EP45C-DS3R

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):
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
Intel digital thermal sensor...                             Success!
(driver `coretemp')
Intel AMB FB-DIMM 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):
Probing for Super-I/O at 0x2e/0x2f
Trying family `National Semiconductor'...                   No
Trying family `SMSC'...                                     No
Trying family `VIA/Winbond/Nuvoton/Fintek'...               No
Trying family `ITE'...                                      Yes
Found `ITE IT8718F Super IO Sensors'                        Success!
(address 0x290, driver `it87')
Probing for Super-I/O at 0x4e/0x4f
Trying family `National Semiconductor'...                   No
Trying family `SMSC'...                                     Yes
Found unknown chip with ID 0x0b00

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):
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):
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):
Using driver `i2c-i801' for device 0000:00:1f.3: Intel ICH10
Module i2c-dev loaded successfully.
Next adapter: nouveau-0000:01:00.0-0 (i2c-0)
Do you want to scan it? (YES/no/selectively):
Client found at address 0x49
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'...                     No
Probing for `Dallas Semiconductor DS1621/DS1631'...         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 `SMSC EMC1023'...                               No
Probing for `SMSC EMC1043'...                               No
Probing for `SMSC EMC1053'...                               No
Probing for `SMSC EMC1063'...                               No
Client found at address 0x50
Probing for `Analog Devices ADM1033'...                     No
Probing for `Analog Devices ADM1034'...                     No
Probing for `SPD EEPROM'...                                 No
Probing for `EDID EEPROM'...                                Yes
(confidence 8, not a hardware monitoring chip)

Next adapter: nouveau-0000:01:00.0-1 (i2c-1)
Do you want to scan it? (YES/no/selectively):
Next adapter: ivtv i2c driver #0 (i2c-3)
Do you want to scan it? (yes/NO/selectively):

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

Driver `it87':
* ISA bus, address 0x290
Chip `ITE IT8718F Super IO Sensors' (confidence: 9)

Driver `coretemp':
* Chip `Intel digital thermal sensor' (confidence: 9)

Do you want to overwrite /etc/sysconfig/lm_sensors? (YES/no):

Answer yes to the last question and all the support modules are loaded.

How do I read sensors chip data such as temperature?
Type the following command at shell prompt:

$ sensors

Sample Output
Adapter: ISA adapter
Core 0:       +34.0°C  (high = +80.0°C, crit = +100.0°C)

Adapter: ISA adapter
Core 1:       +34.0°C  (high = +80.0°C, crit = +100.0°C)

Adapter: ISA adapter
in0:          +1.06 V  (min =  +0.00 V, max =  +4.08 V)
in1:          +2.00 V  (min =  +0.00 V, max =  +4.08 V)
in2:          +3.26 V  (min =  +0.00 V, max =  +4.08 V)
in3:          +2.98 V  (min =  +0.00 V, max =  +4.08 V)
in4:          +0.24 V  (min =  +0.00 V, max =  +4.08 V)
in5:          +0.02 V  (min =  +0.00 V, max =  +4.08 V)
in6:          +0.10 V  (min =  +0.00 V, max =  +4.08 V)
in7:          +3.17 V  (min =  +0.00 V, max =  +4.08 V)
Vbat:         +3.22 V
fan1:        1418 RPM  (min =    0 RPM)
fan2:         672 RPM  (min =    0 RPM)
fan3:        1019 RPM  (min =    0 RPM)
fan4:        1056 RPM  (min =    0 RPM)
temp1:        +40.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp2:        +26.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermal diode
temp3:         -2.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor

If you want to watch realtime output using the watch command, type

$ watch sensors

3 Responses to “Monitoring CPU temp on Fedora”

  1. Pete says:

    Hi, do you know if it supports alerts by email?

  2. Pete says:


    Do you know it its possible to send email reports of the temp?

    • newlife007 says:

      Yes, you could output to a text file and then use mail command to send it. That’s the beauty of Linux and the ability to use multiple applications to achieve a purpose.

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