[ltp] [Thinkpad X31] Fan speed = 0

[Richard Neill]

Maxime DANIS wrote:
> Hello Everybody.
> 
> I have the feeling that the fan(s) of my thinkpad X31 is/are never used?

I also have an X31, and it does run very quiet. If you are in a cool 
environment, and only make light use of the CPU, it's perfectly 
reasonable to expect the fan to stay off - so enjoy the silence.

(If you want to test, run `nice yes > /dev/null` in a terminal and watch 
the CPU usage hit 100%; it will remain responsive though. Keep an eye on 
the temperature, and the fan.)

HTH,

Richard


> 
> # /proc/acpi/ibm/fan
> 
> status:       enabled
> speed:        0
> level:        auto
> commands:     level <level> (<level> is 0-7, auto, disengaged)
> commands:     enable, disable
> commands:     watchdog <timeout> (<timeout> is 0 (off), 1-120 (seconds))
> commands:     speed <speed> (<speed> is 0-65535)
> 
> I am reading this article
> 
> http://www.thinkwiki.org/wiki/How_to_control_fan_speed
> 
> But...
> 
>  * I prefer to decrease the fan activity threshold than command it manually.
>  * I still do not understand if it is a matter of BIOS or Kernel or both?
>  * In case 2, Is it related to CPU governors?
> 
> thx
>