linux-kernel - Re: 2.6.22 regression: thermal trip points

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Date:	Fri, 03 Aug 2007 08:43:44 -0300
From:	"Renato S. Yamane" <renatoyamane@...dic.com.br>
To:	Len Brown <lenb@...nel.org>
CC:	Knut Petersen <Knut_Petersen@...nline.de>,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>,
	trenn@...e.de, pavel@....cz, mjg59@...f.ucam.org,
	linux-acpi@...r.kernel.org
Subject: Re: 2.6.22 regression: thermal trip points

Len Brown escreveu:
> On Thursday 02 August 2007 04:40, Knut Petersen wrote:
>> mainboard: AOpen i915GMm-hfs, AWARD BIOS
>> cpu: Pentium-M 750 (0.8 to 1.86 MHz)
>> openSuSE 10.2 with kernel 2.6.22.1
>>
>> The cpu fan can not be controled by linux kernel.
>> The BIOS will switch on the cpu fan a bit above 50 deg. Celsius.
>> The active and passive trip points both are set to 50 deg. Celsius.
>> Temperature of the idle cpu at 800 Mhz: 34 to 42 deg. C.
>> The BIOS never changes the trip points.
>> Cpufreq does work perfectly.

On my Toshiba M45-S355 (Toshiba Bios, Pentium M 750 - 0.8 at 1.86GHz, 
Debian Etch) I see the same using Kernel 2.6.21.6

>> Previously there was the possibility  to add something like
>>
>> echo  "100:0:65:70:0" > /proc/acpi/thermal_zone/THRM/trip_points
>> echo  2 > /proc/acpi/thermal_zone/THRM/polling_frequency
>> echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor

I never do that, but see below (Kernel 2.6.21.6):

cat /proc/acpi/thermal_zone/TZCL/trip_points
critical (S5):           105 C

cat /proc/acpi/thermal_zone/TZCL/polling_frequency
polling frequency:       2 seconds

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand

Regards,
Renato S. Yamane
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