Temperature monitor and fan control?

John Hupp lubuntu at prpcompany.com
Thu Feb 27 19:26:03 UTC 2014

Thanks for pointing the way to that piece of progress.

The default setup results in reported temperatures in the 30's and very 
low 40's (C).

But with a dual-boot setup on this machine and I8kfan running under 
Windows, it reports temperatures in the mid-40's and 50's, and higher if 
the machine is working (61 C right now with it doing a Windows Update).

Under Lubuntu, I saw by hovering over the temp that it was reporting 
/sys/class/thermal/thermal_zone0.  I don't have lm-sensors installed, 
and HardInfo: Sensors reports nothing, so I didn't have any idea that 
way about what sensors might be available to report.  But I found that 
there was also a /sys/class/thermal/cooling_device0 directory.  In 
Lxpanel's Temperature Monitor setup, I entered 'cooling_device0' in the 
Sensor field and rebooted, and now it reports idle temperatures in the 
40's-50's, closer to i8kfan readings under Windows.

But concerning fan behavior: Under Windows, Fan 1 starts at low speed at 
45 C.  At 50 or 55 it steps up to high speed.  Fan 2 starts running also 
if it reaches 60 or 65 C.

But the fans run a lot less under Lubuntu.  They don't turn on at all 
until cooling_device0 hits 63 C, at which point both fans come on.

I also have some lingering doubt about the accuracy of Temp Monitor's 
report.  I say that because in Lubuntu, cooling_device0 temp reported 49 
C, and when I rebooted into Windows the initial temp reported was 60 C.  
(Although I grant that temp could have climbed by 11 C during boot 

So I am still interested in how to do fan control in Lubuntu, since 
whatever controls fans by default (anyone know whether it is the BIOS or 
something else?) lets the CPU get fairly hot before taking any action.

Anyone know of a fan control solution?

On 2/26/2014 8:41 PM, brendanperrine at gmail.com wrote:
> There is a temperture monitor for lxpanel. To add it to the panel 
> settings click on the panel applets tab and then click on the button 
> that says add and click temperture monitor. This comes by default in 
> lubuntu. I not everyone customizes lxpanel as much as I do. You can 
> use the up and down buttons on lxpanel to move the temperture monitor 
> to where you want it. Although this does not have fan controls.
> On Wed, Feb 26, 2014 at 5:09 PM, John Hupp <lubuntu at prpcompany.com 
> <mailto:lubuntu at prpcompany.com>> wrote:
>     In Saucy, on a Dell Inspiron 8200 laptop, I want to monitor the
>     CPU temperature and preferably have the option of controlling the
>     fans.
>     I8kmon, installed by the i8kutils package, would seem to be ideal.
>     See the documentation at
>     http://manpages.ubuntu.com/manpages/saucy/man1/i8kmon.1.html
>     I installed i8kutils from the standard repo, but I can't get
>     i8kmon working at all.
>     Just running 'i8kmon' should start the program in user mode and
>     display a user interface with the current temperature and button
>     controls for the fans.  It does indeed display a very small
>     interface on the desktop -- with no temperature display, though
>     there are a couple plain button controls.
>     ps -e | grep i8 shows nothing running.  And if I click a button in
>     the interface, it generates an error for /proc/i8k, saying there
>     is no such file or directory.
>     Does anyone know how to get this or something equivalent running
>     in Lubuntu?
>     -- 
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