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-   -   My CPU is always 40 C or 104 F (http://www.linuxquestions.org/questions/showthread.php?t=4175459518)

TrickyRickinOK 04-25-2013 01:37 AM

My CPU is always 40 C or 104 F
 
I'm just getting back in to linux, and I am running Slackware 14 x86_64.
I'll probably upgrade to current soon.

My CPU is always reported as 40 C. Is it likely that there isn't a real sensor on the CPU? Maube I have something missing from
the kernel?
Sometimes the one of the fan seems to change speed.
I'm not sure if it always did that until a few months ago it was in a room with a bunch of aquariums always running Vista.
The Computer is a HP-Pavilion KJ387AA-ABA a6403w/Napa, BIOS 5.20 10/24/2008
Let me know if I should post the full output of dmesg when it boots.
thanks.

rick@Ricks-slackware:~$
rick@Ricks-slackware:~$ uname -a
Linux Ricks-slackware 3.2.29 #1 SMP Tue Apr 23 22:41:09 CDT 2013 x86_64 Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz GenuineIntel GNU/Linux
rick@Ricks-slackware:~$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +40.0C (crit = +75.0C)

rick@Ricks-slackware:~$
)

rick@Ricks-slackware:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz
stepping : 13
microcode : 0xa3
cpu MHz : 1799.834
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm dtherm
bogomips : 3599.66
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz
stepping : 13
microcode : 0xa3
cpu MHz : 1799.834
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good nopl aperfmperf pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm dtherm
bogomips : 3599.75
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:

rick@Ricks-slackware:~$

H_TeXMeX_H 04-25-2013 02:11 AM

That seems like a normal temperature to me, and for that CPU. You can also check the BIOS for more accurate temperature data.

TobiSGD 04-25-2013 10:02 AM

As H_TeXMeX_H said, for that CPU with the stock cooler the temepraure is pretty normal. Does it change under load?
Also, do you have power-saving for your CPU enabled?

jefro 04-25-2013 02:18 PM

One some systems there are actually two sensors. There could be some issue where you aren't reading the correct one.

I think I'd boot to bios to see if any health numbers show temps. On cold boot it ought to be near room temp for a few seconds at least. In bios it ought to remain pretty cool.

TrickyRickinOK 04-26-2013 01:08 AM

There doesn't seem to be a way to access the sensor(s) from the BIOS.

I guess I'm going to have to have it off a while to check if it makes a difference,
even with it on all of the time the room temperature varies enough that I would think
it would change. We have had some nights that are cool for this part of April and it's
right under a window that lets alot of the cold in.

JonathanWilson 04-26-2013 12:12 PM

35-45degC sounds about right for a standard stock fan and cpu with an ambient room temp of 23degC

Also the room temp won't make much difference to the CPU temp unless the room has quite a large change in temp.

Mine tends to go up to about 52-55degC when maxed out, which seems like a lot but is about "normal" although I can get it to drop a few degs by cleaning the fins on the stock fan as my computer is in a bedroom under a table so tends to get quite dusty over time and is quite a sticky dust due to smoking (i know a bad habit)

TrickyRickinOK 04-26-2013 02:48 PM

I'm dual booting Vista and I found a windows program that give the CPU temp and its not always 40 C.
It looks like linux is not seeing the real temperature for some reason.

jefro 04-26-2013 07:05 PM

I forget how to choose the sensor. Maybe here. http://www.cyberciti.biz/faq/howto-l...s-information/

I guess it could be that your current display for linux temps is not being refreshed?

TrickyRickinOK 04-30-2013 10:40 PM

I found my sensors.
 
I'm not sure if this was accessible before I upgraded the kernel, and the 40 is still always 40.
I here the fan speed up when the cores get to around 75. I have quite got a handle how to lower that.

rick@Ricks-slackware:~$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +40.0C (crit = +75.0C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0: +72.0C (high = +86.0C, crit = +100.0C)
Core 1: +74.0C (high = +86.0C, crit = +100.0C)

rick@Ricks-slackware:~$


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