CPUTemp displaying temp of wrong sensor

[dicconspain]

CPUTemp is showing it8620-isa-0a30 temp3: which always remains at +28.0°C

It should be showing coretemp-isa-0000 Physical id 0 (at the point I ran sensors in the example below this was +38.0°C)

This is the output of sensors on my Ubuntu 15.10 computer:

sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +27.8°C (crit = +105.0°C)
temp2: +29.8°C (crit = +105.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical 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: +38.0°C (high = +80.0°C, crit = +100.0°C)
Core 2: +36.0°C (high = +80.0°C, crit = +100.0°C)
Core 3: +35.0°C (high = +80.0°C, crit = +100.0°C)

it8620-isa-0a30
Adapter: ISA adapter
in0: +0.02 V (min = +0.00 V, max = +3.06 V)
in1: +2.03 V (min = +0.00 V, max = +3.06 V)
in2: +2.03 V (min = +0.00 V, max = +3.06 V)
in3: +1.98 V (min = +0.00 V, max = +3.06 V)
in4: +0.01 V (min = +0.00 V, max = +3.06 V)
in5: +1.75 V (min = +0.00 V, max = +3.06 V)
in6: +1.56 V (min = +0.00 V, max = +3.06 V)
3VSB: +3.38 V (min = +0.00 V, max = +6.12 V)
Vbat: +2.98 V
fan1: 826 RPM (min = 0 RPM)
fan2: 0 RPM (min = 0 RPM)
fan3: 0 RPM (min = 0 RPM)
fan4: 0 RPM (min = 0 RPM)
fan5: 0 RPM (min = 0 RPM)
temp1: +30.0°C (low = +127.0°C, high = +127.0°C) sensor = thermistor
temp2: +127.0°C (low = +127.0°C, high = +127.0°C) sensor = thermistor
temp3: +28.0°C (low = +127.0°C, high = +127.0°C) sensor = Intel PECI
intrusion0: ALARM

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[fossfreedom]

hmm - from here and the linked StackOverflow Q&A - the CPUTemp sensor is pulling its value from /sys/class/thermal/thermal_zoneN/tmp which corresponds to the first CPU core.

• CPU temperature module broken with (arch) linux 3.15  enkore/i3pystatus#69

If you can think of a better algorithm, please let me know. thanks.

[fossfreedom]

All I can say is that the indicator displays the temperature exactly as the linux kernel sees it - the kernel always writes its CPU based temperatures to a known location.

I don't know what acpi does but I guess it interrogates a whole load of other data - puts it into a big pot - runs a load of calculations over it and out pops a number which you can see...

[Arup65]

Hi, do we need install of lm-sensors to get temp readout? In the now discontinued indicator-sensors, it would pick temperature up without the need of lm-sensors.

[fossfreedom]

All versions of the indicator displayed whatever the kernel saw. Over time the kernel parameter has changed. I have not dug into lm sensors but it may be interesting if someone does to see which kernel parameter it uses

[Invis1ble]

I have the same issue. In my case cputemp shows GPU temp (radeon-pci-0500 temp1) instead of CPU.

$ sensors
radeon-pci-0500
Adapter: PCI adapter
temp1:        +35.0°C  (crit = +120.0°C, hyst = +90.0°C)

atk0110-acpi-0
Adapter: ACPI interface
Vcore Voltage:          +1.20 V  (min =  +0.80 V, max =  +1.60 V)
CPU/NB Voltage:         +1.15 V  (min =  +0.80 V, max =  +1.60 V)
CPU VDDA Voltage:       +2.53 V  (min =  +2.00 V, max =  +3.00 V)
DRAM Voltage:           +1.57 V  (min =  +1.40 V, max =  +1.90 V)
HT Voltage:             +1.22 V  (min =  +0.80 V, max =  +1.50 V)
NB Voltage:             +1.12 V  (min =  +0.90 V, max =  +1.35 V)
SB Voltage:             +1.11 V  (min =  +0.80 V, max =  +1.50 V)
+3.3V Voltage:          +3.31 V  (min =  +2.97 V, max =  +3.63 V)
+5V Voltage:            +5.00 V  (min =  +4.50 V, max =  +5.50 V)
+12V Voltage:          +12.11 V  (min = +10.20 V, max = +13.80 V)
CPU Temperature:        +41.0°C  (high = +40.0°C, crit = +90.0°C)
MB Temperature:         +39.0°C  (high = +35.0°C, crit = +95.0°C)
NB Temperature:         +45.0°C  (high = +65.0°C, crit = +95.0°C)
SB Temperature:         +44.0°C  (high = +35.0°C, crit = +75.0°C)
OPT_TEMP1 Temperature:   +0.0°C  (high =  +0.0°C, crit = +90.0°C)
OPT_TEMP2 Temperature:   +0.0°C  (high =  +0.0°C, crit = +90.0°C)
OPT_TEMP3 Temperature:   +0.0°C  (high =  +0.0°C, crit = +90.0°C)

k10temp-pci-00c3
Adapter: PCI adapter
temp1:         +0.0°C  (high = +70.0°C)
                       (crit = +90.0°C, hyst = +85.0°C)

[ghost]

HI all ,
for custom cpu temperature using TLP

TEM=$(tlp-stat -t | awk '/CPU temp/ {print $4}'); if [ $TEM -ge 60 ]; then echo $TEM; killall notify-osd; notify-send "WARNING - Rising Temperature" "$TEM ℃"; else echo $TEM; fi

save this code in a executable shell script and call it from indicator-sysmonitor.