How to read Hardware Temp Sensors

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Neil Edmond
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How to read Hardware Temp Sensors

Post by Neil Edmond » Fri Aug 23, 2019 6:47 pm

Below is the output of my hardware sensors:

Code: Select all

coretemp-isa-0000
Adapter: ISA adapter
Core 0:       +63.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:       +65.0°C  (high = +86.0°C, crit = +100.0°C)

w83627dhg-isa-0290
Adapter: ISA adapter
Vcore:        +1.30 V  (min =  +0.00 V, max =  +1.74 V)
in1:          +1.90 V  (min =  +1.15 V, max =  +1.67 V)  ALARM
AVCC:         +3.31 V  (min =  +2.98 V, max =  +3.63 V)
+3.3V:        +3.31 V  (min =  +2.98 V, max =  +3.63 V)
in4:          +1.46 V  (min =  +0.26 V, max =  +0.61 V)  ALARM
in5:          +1.58 V  (min =  +1.42 V, max =  +0.00 V)  ALARM
in6:          +1.42 V  (min =  +1.72 V, max =  +0.70 V)  ALARM
3VSB:         +3.31 V  (min =  +2.98 V, max =  +3.63 V)
Vbat:         +3.22 V  (min =  +2.70 V, max =  +3.63 V)
fan1:           0 RPM  (min = 10546 RPM, div = 128)
fan2:        2537 RPM  (min = 3409 RPM, div = 4)  ALARM
fan3:           0 RPM  (min = 3515 RPM, div = 128)  ALARM
fan4:           0 RPM  (min = 10546 RPM, div = 128)  ALARM
fan5:        10546 RPM  (min = 5273 RPM, div = 128)
temp1:        +43.0°C  (high = +59.0°C, hyst = +32.0°C)  sensor = thermistor
temp2:        +52.5°C  (high = +80.0°C, hyst = +75.0°C)  sensor = CPU diode
temp3:       +127.0°C  (high = +80.0°C, hyst = +75.0°C)  ALARM  sensor = thermistor
cpu0_vid:    +1.138 V
intrusion0:  OK
My question is about how to identify what is being reported. I understand what Core 0 and Core 1 are, and can identify my CPU fan and two case fans, but I don't know what the in1, in4, in5 and in6 voltage readings are, or why they are over the max voltage. Also temp1 and temp2 should be CPU temps, but I have no idea what temp3 is reading or why it's so high. Can some one tell me where to look for more info?

Also the possibly relevant inxi info from the machine in question:

Code: Select all

Machine:
  Type: Desktop Mobo: ASUSTeK model: P5B-E v: Rev 1.xx 
  serial: <root required> BIOS: American Megatrends v: 1807 date: 04/15/2009 
CPU:
  Topology: Dual Core model: Intel Pentium Dual E2220 bits: 64 type: MCP 
  arch: Core Merom rev: D L2 cache: 1024 KiB 
  flags: lm nx pae sse sse2 sse3 ssse3 bogomips: 9628 
  Speed: 1204 MHz min/max: 1200/2400 MHz Core speeds (MHz): 1: 1204 2: 1204 
Graphics:
  Device-1: NVIDIA G98 [GeForce 8400 GS Rev. 2] vendor: ASUSTeK 
  driver: nvidia v: 340.107 bus ID: 01:00.0 
  Display: x11 server: X.Org 1.19.6 driver: nvidia 
  unloaded: fbdev,modesetting,nouveau,vesa 
  resolution: 1280x1024~60Hz, 1280x1024~60Hz 
  OpenGL: renderer: GeForce 8400 GS/PCIe/SSE2 v: 3.3.0 NVIDIA 340.107 
  direct render: Yes 

Sensors:
  System Temperatures: cpu: 46.0 C mobo: 43.0 C gpu: nvidia temp: 63 C 
  Fan Speeds (RPM): cpu: 2500 fan-1: 878 fan-3: 0 fan-4: 0 fan-5: 811 
  Voltages: 12v: N/A 5v: N/A 3.3v: 3.31 vbat: 3.22

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catweazel
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Re: How to read Hardware Temp Sensors

Post by catweazel » Fri Aug 23, 2019 7:24 pm

Neil Edmond wrote:
Fri Aug 23, 2019 6:47 pm
Can some one tell me where to look for more info?
man sensors.conf
"There is, ultimately, only one truth -- cogito, ergo sum -- everything else is an assumption." - Me, my swansong.

Neil Edmond
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Re: How to read Hardware Temp Sensors

Post by Neil Edmond » Fri Aug 23, 2019 7:33 pm

Sometimes all one needs is a little nudge in the right direction. Thanks for that. Kind of reminds me of the Debian forum where the standard response to everything is "read the manual".

Nope...didn't really help after all. I've read a bunch of words, but they didn't provide any more info than I already had.

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catweazel
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Re: How to read Hardware Temp Sensors

Post by catweazel » Fri Aug 23, 2019 8:46 pm

Neil Edmond wrote:
Fri Aug 23, 2019 7:33 pm
Sometimes all one needs is a little nudge in the right direction. Thanks for that. Kind of reminds me of the Debian forum where the standard response to everything is "read the manual".

Nope...didn't really help after all. I've read a bunch of words, but they didn't provide any more info than I already had.
It explains how the n values are calculated. You then need to use your hardware expertise in interpreting the data. There should be more than enough information in that man page to help you start formulating some google searches. Besides, if you're not over-clocking and your machine is behaving itself, I wouldn't be concerned about the sensors output. Linux isn't the sharpest tool in the shed for that kind of data. I'm lucky to get temperature values of my CPU. Linux simply doesn't keep up with sensors all that well. Vendors keep bringing out new sensors and don't provide drivers or data sheets. This is why you need to develop some expertise :)
"There is, ultimately, only one truth -- cogito, ergo sum -- everything else is an assumption." - Me, my swansong.

jglen490
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Re: How to read Hardware Temp Sensors

Post by jglen490 » Fri Aug 23, 2019 10:01 pm

Well, catweazel as usual is right. But, that doesn't mean that everything you need to know is in the man pages. They are more often than not, technical. And unless you understand the technical aspect of which a particular man page speaks, the only thing that will happen is your eyes will turn red and watery.

You can spend a considerable part of your life studying the technology of the personal computer and your life would still not be fulfilling.

I have installed an application on my desktop unit called psensors. I have no idea of the level of precision to which it reads or interprets various sensors. All I do is watch for trends: is a particular temp line bouncing up and down the way it usually does, or is it trending upwards/downwards. Does the reported temp start off about the same after each reboot and does it seem to be pretty steady?

Very imprecise, but telling in trends that it reports - not the actual temps that it reports. The language of imprecision, "seem to be", "usually does" is actually its greatest asset. Do I care if a particular sensor is reporting 102* F at some point in time? Maybe, maybe not. What else is going on that might affect that sensor? It doesn't matter that it does or doesn't affect that sensor, only that your machine is behaving as it usually does under a specific event/condition.

I have an SSD that has from day one shown 210* F. Was I alarmed at first? Darned right I was! And then I realized it doesn't change, and it hasn't melted in its mount, nor is it glowing, nor can I roast marshmallows or chestnuts over it. It' appears to be an anomaly, but it's absolutely consistent in its anomalous behavior. It no longer bothers me. If it suddenly dives to 190* some day or 275*, I might look into it further because then it's no longer consistent in behavior. That's the meaning of "expertise"!
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Toshiba A135-S2386, Intel T2080, ATI Radeon® Xpress 200M Chipset, 2GB RAM, 500GB

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