Thermal Zones and Throttling

Thermal Zones and Throttling

[Paulo J. Matos]

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?

Cheers,
-- 
Paulo Jorge Matos - pocm at soton.ac.uk
http://www.personal.soton.ac.uk/pocm
PhD Student @ ECS
University of Southampton, UK

Re: Thermal Zones and Throttling

[Zhang Rui]

HI, Paulo,

On Thu, 2007-04-12 at 22:10 +0100, 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?
> 
Please attach the acpidump file of your laptop.
Or you can file a bug report at bugzilla.kernel.org and attach the
acpidump there, so that we can track it better. :)

Thanks,
Ray

Re: Thermal Zones and Throttling

[Len Brown]

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

Re: Thermal Zones and Throttling

[Paulo J. Matos]

On 4/18/07, Len Brown <lenb@kernel.org> wrote:
>
> Cat /proc/cpuinfo will tell if the hardware has automatic throttling
> for thermal emergencies.
>

Which flag tells me that?
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Mobile Intel(R) Pentium(R) 4 - M CPU 2.20GHz
stepping        : 7
cpu MHz         : 2200.000
cache size      : 512 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 2
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up cid
bogomips        : 4389.84
clflush size    : 64

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

Well, it's probably a very badly ventilated, 2.2Ghz Pentium4 M in a laptop! :-(
I've already ordered some notebook coolers!

> -Len
> -
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-- 
Paulo Jorge Matos - pocm at soton.ac.uk
http://www.personal.soton.ac.uk/pocm
PhD Student @ ECS
University of Southampton, UK