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Old 09-28-2004, 02:34 AM   #1
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lem sensors, a7n8x-x and various output

I've just installed debian on an a7n8x-x based board (athlon 2600+) and while I have lm-sensors working to the point of giving output, I'm not too sure how to interpret it - or whether to really trust what it's saying.

running sensors-detect detects a few chips on the nforce2 bus, and with those modules installed I can get the following output:

Adapter: SMBus nForce2 adapter at 5500
VCore 1:   +1.70 V  (min =  +1.57 V, max =  +1.73 V)       
+3.3V:     +3.28 V  (min =  +3.14 V, max =  +3.47 V)       
+5V:       +4.92 V  (min =  +4.76 V, max =  +5.24 V)       
+12V:     +11.67 V  (min = +10.82 V, max = +13.19 V)       
-12V (reserved):
          -12.20 V  (min =  -0.00 V, max =  -0.00 V)       
-5V (reserved):
           -5.12 V  (min =  -0.00 V, max =  -0.00 V)       
CPU Fan:  6490 RPM  (min = 1997 RPM, div = 4)              
Chassis Fan:
          5487 RPM  (min = 3994 RPM, div = 2)              
Power Fan:   0 RPM  (min = 3994 RPM, div = 2)              
M/B Temp:    +39 C  (high =   +45 C, hyst =   +40 C)   
CPU Temp (Intel):
             +24 C  (high =   +60 C, hyst =   +50 C)   
Power Temp:
              -0 C  (high =   +45 C, hyst =   +40 C)   
CPU Temp (AMD):
             +25 C  (high =   +60 C, hyst =   +50 C)   
vid:      +1.650 V

Adapter: SMBus nForce2 adapter at 5000
Memory type:            DDR SDRAM DIMM
Memory size (MB):       256

Adapter: SMBus nForce2 adapter at 5500
temp:        +41 C  (high =  +110 C)
The closest one to any reality seems to be the w83l785ts-i2c-1-2e for CPU temperature. It seems to read seriously high sometimes, whipping up to 65 degrees and above, and the 'high' mark of 110C looks rather odd, but I'm not too sure what that's meant to be referring to, a maximum acceptable cpu temperature (which I doubt), a maximum measurable temperature (more likely) or just a misread maximum (also possible I'd guess). It seems to be quite in-line with bios temperatures if I do a quick reset and read the temperature through the bios, except in the high ranges. I guess this could be the cpu rapidly cooling down in the few seconds a reset takes, but I'm not sure .

the output from asb100-i2c-1-2d doesn't seem to be much use either, when it comes to temperature. It looks to read a motherboard temp that's pretty high all the time (not far off CPU temp) and its own CPU temperature values are essentially static - they don't change much from the 24/25 values up there.

Anyone with experience with these boards know any more specifics on how I should be reading/trusting these values?

Old 09-28-2004, 10:41 PM   #2
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I wrote what I did to get lmsensors working on my nforce2 board here:

In my case, sensors-detect gave me a module that wouldn't work. After much Googling, I found one that does. I use an MSI K7N2G board, I am running Debian Unstable on that machine with Kernel 2.6.7.

I installed "ksensors" to give a continuous display of CPU and hard disk temperatues (using hddtemp). I found that sometime temperatures read erroneously low for the hard disk, but only for a few seconds. The CPU temperature has always agreed with the BIOS reading. If your CPU temp really is spiking that high under load, you must have a heatsink problem.


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