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Rychu avatar Ubuntu

Motd temperature reading is incorrect after processor change

cn flag
Rychu

I recently changed my CPU and MOBO to i5-12400 installed in the Gigabyte B660M DS3H DD4 motherboard. Since then I have been having wrong motd Temperature readings:

Welcome to Ubuntu 21.10 (GNU/Linux 5.13.0-28-generic x86_64)

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  System information as of Fri Feb 18 11:25:17 AM CET 2022

  System load:    1.26      Processes:                        450
  Usage of /home: unknown   Users logged in:                  0
  Memory usage:   10%       IPv4 address for xxx:             yyy
  Swap usage:     0%        IPv4 address for xxx:             yyy
  Temperature:    46.0 C    IPv4 address for xxx:             yyy

After the change I did lm-sensors procedure and from sensors I get:

acpitz-acpi-0
Adapter: ACPI interface
temp1:        +16.8°C  (crit = +20.8°C)
temp2:        +27.8°C  (crit = +105.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +38.0°C  (high = +80.0°C, crit = +100.0°C)
Core 0:        +36.0°C  (high = +80.0°C, crit = +100.0°C)
Core 1:        +34.0°C  (high = +80.0°C, crit = +100.0°C)
Core 2:        +35.0°C  (high = +80.0°C, crit = +100.0°C)
Core 3:        +34.0°C  (high = +80.0°C, crit = +100.0°C)
Core 4:        +34.0°C  (high = +80.0°C, crit = +100.0°C)
Core 5:        +34.0°C  (high = +80.0°C, crit = +100.0°C)

Just to be sure which reading is correct I quickly rebooted to UEFI and there 38.0°C was displayed. When the system booted motd again displayed 46.0 C.

Is it something I can fix?

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paladin avatar
kr flag
paladin
I'm not sure but I would guess motd is displaying the system temperature and not the CPU temperature. I suggest you inspect the motd-script by yourself. `ls -d /etc/*motd*` this should show you the places where all motd-configs are located.
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Doug Smythies avatar Ubuntu
gn flag
Doug Smythies

The "Message of The Day" temperature sampling time is immediately after a rather large amount of login related code has just executed. The processor is a just a little warm as a result. When you come along later, it has dissipated that heat.

The answer here is that both readings are accurate at the time they are taken.

See also my Ubuntu forums answer to this same question, with supporting turbostat data

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Rychu avatar
cn flag
Rychu
Yes, you are right! In one session I run `watch -n 0.1 sensors` and create another one and I see the temp peaking to 46°C +/- 2°C from 36°C right after the second session starts. But it is just for a millisecond. Nice, thanks.
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