Re: Thermal Zones and Throttling

[Len Brown <lenb@kernel.org>]

On Thursday 12 April 2007 17:10, Paulo J. Matos wrote:
> Hello,
> 
> I'm almost sure by laptop is burning [almost] and yet, no throttling
> change is happening.
> The only wierd thing I can find is the fact that:
> euler ~ # cat /proc/acpi/processor/CPU0/info
> processor id:            0
> acpi id:                 0
> bus mastering control:   yes
> power management:        yes
> throttling control:      yes
> limit interface:         yes
> euler ~ # cat /proc/acpi/processor/CPU0/throttling
> state count:             4
> active state:            T0
> states:
>    *T0:                  00%
>     T1:                  25%
>     T2:                  50%
>     T3:                  75%
> euler ~ # ls -la /proc/acpi/thermal_zone/
> total 0
> dr-xr-xr-x  2 root root 0 Apr 12 22:07 .
> dr-xr-xr-x 10 root root 0 Apr 12 15:26 ..
> 
> Isn't it wierd that although I have throttling control, there are no
> thermal zones?
> 
> I'm almost sure throttling should be activated... my laptop is
> practically burning my hands as I write this.... Is there anything I
> can check out?

Cat /proc/cpuinfo will tell if the hardware has automatic throttling
for thermal emergencies.

However, the real question is why you're having a thermal emergency
in the first place.  Is there dust blocking the fan?

-Len