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Old 06-09-2014, 10:57 AM   #1
DJ Shaji
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Unhappy CPU reporting incorrect temperature


I have a Pentium 4 based system which is almost 12 years old. I use it as a headless server. It works perfectly except that it reports the cpu temperature always as 21.8 'C. It used to work fine before, and I don't know what might have caused it. I didn't do any major updates to the system recently. It runs Squeeze and the kernel is 3.2.0-4-686-pae #1 SMP Debian 3.2.46-1.

The thing is, it's a very hot summer, and since the OS isn't getting the right temperature, it won't be able to do anything if the CPU temperature goes critical, as it won't be able to see it. I've seen the kernel throttle CPU frequency when it got too hot in the past. It used to work perfectly.

What are my options here? Any ideas? I've looked in dmesg, and all is well. The system runs fine, except for this one glitch. Is there anything I can do? I googoled the interweb, but didn't find anything related to my issue. It's not high priority,but I would like it if it could be [Solved]

Last edited by DJ Shaji; 06-09-2014 at 10:58 AM. Reason: gram mere
 
Old 06-09-2014, 11:13 AM   #2
metaschima
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Run 'sensors-detect' as root, insert the modules that it says and post the output of 'sensors'.
 
Old 06-09-2014, 12:45 PM   #3
DJ Shaji
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sensors-detect gives me a "Sorry, no sensors were detected" message, and sensors just gives me the same
Code:
dj@darkstar:~# sensors
acpitz-virtual-0
Adapter: Virtual device
temp1:        +21.8C  (crit = +100.1C)
 
Old 06-09-2014, 12:56 PM   #4
metaschima
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Is this a laptop ? If so, then I don't believe that this is the CPU temperature. What were previous temperatures ?
 
Old 06-12-2014, 01:12 PM   #5
DJ Shaji
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Quote:
Originally Posted by metaschima View Post
Is this a laptop ? If so, then I don't believe that this is the CPU temperature. What were previous temperatures ?
it's a desktop, and yes the temperature is definitely not correct. hddtemp gives the following:

Code:
root@darkstar:djshaji# hddtemp /dev/sda /dev/sdb /dev/sdc
/dev/sda: SAMSUNG SV4002H: 31C
/dev/sdb: ST340015A: 45C
/dev/sdc: ST340810A: 45C
so the cpu temp reported (21.8) cant be correct. Plus, the very fact that it reports the same temp implies that something is wrong. Is there some module I need to install for the 3.2.46 kernel that wasn't needed before?

It used to idle around 40 'C and jumped to the high 60s under heavy load e.g. a compile.

Last edited by DJ Shaji; 06-12-2014 at 01:14 PM.
 
Old 06-12-2014, 01:19 PM   #6
metaschima
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You can check to make sure you have all the hardware monitoring modules enabled in the kernel, they usually are for most distros.

Otherwise the sensor may have broken, especially if the name of the sensor is the same as it was in the past and the temperature is no longer correct.
 
  


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