[ltp] Noisy fan on T42

[Hamie]

Alexandru D. Salcianu wrote:

>Hello!
>
>I checked the CPU speed by looking into /proc/cpuinfo (I will try your
>method too).  As expected, the CPU speed stays at 600Mhz most of the
>time, and goes up only when I do something serious.  I don't think the
>CPU frequency or the CPU temperature is the issue: as indicated by
>ibm_acpi, the CPU temperature (the first of the 8 reported
>temperatures) is quite small: 40-42C
>
>I think one of the following situations takes place:
>
>1) the temperature indications from ibm_acpi are incorrect;
>
>2) there is some other source of heat (unlikely: I've tried laptop
>   mode to decrease the heat generated by the HDD; I've even booted
>   the system in text mode to avoid the GPU generated heat; also, when
>   I ran X, the radeon driver has the dynamic frequency scaling
>   enabled);
>
>3) somehow, linux doesn't realize that the temperature is low and it
>   should stop the fan (once the fan goes full power - pretty soon
>   after booting - it *never* comes back to a slow speed, and it
>   definitely never stops)
>
>  
>

Quite possibly all of these, BUT what's the temp of the GPU? (The 4th 
number from ibm/thermal). Remember the fan has to cool the GPU as well 
as the CPU, so when it gets up your fan will run, regardless of the cpu 
temp.