Re: acpi/sensors temperature on nx6325

[Maciej Rutecki <maciej.rutecki@gmail.com>]

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Mircea Bardac pisze:
> Hi all,
> 
> I'm currently running kernel 2.6.21.3 on a HP nx6325.
> 
> I like having in the taskbar information about cpu/mem/temperature/etc. I 
> found a strange behaviour monitoring the ACPI provided temperature. It 
> currently shows for example 48C constantly, for lots of minutes. 
> 
> Doing a: dd if=/dev/urandom of=/dev/null increases the CPU usage and 
> temperature should increase too. The ACPI temperature stays the same though.
> 
> I have also loaded the lm_sensors modules which, after some monitoring, appear 
> to be working right, meaning "it shows an increasing temperature if the CPU 
> usage increases".
> 
> # cat /proc/acpi/thermal_zone/TZ1/temperature && sensors
> temperature:             48 C
> k8temp-pci-00c3
> Adapter: PCI adapter
> Core0 Temp:
>              +54°C
> Core1 Temp:
>              +53°C
> 
> 
> The ACPI temperature increases only when the trip-point is reached. I hear the 
> fans starting. When the fans stop, the temperature drops "hard" to the 
> previous value.
> 
> I've changed the polling frequency to 1:
> # cat /proc/acpi/thermal_zone/TZ1/polling_frequency
> polling frequency:       1 seconds
> 
> I got the same effect: I can't see the temperature change dynamically, degree 
> by degree. Also, in a test, the sensor went up to 60-65C and the trip-point 
> did't activate. This was with polling set to 1.
> 

Similar on nx6310. Sometimes when I turn on laptop when CPU temperature
(first thermal zone - TZ0) is above 1st trip point the fan doesn't turn
on now, but only when second trip point was reached.

-- 
Maciej Rutecki
http://www.maciek.unixy.pl


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