/proc/acpi/thermal_zone/THRM/temperature always reports 40C - is this a bug?

/proc/acpi/thermal_zone/THRM/temperature always reports 40C - is this a bug?

[Daniel Drake]

Hi,

Ethan, at http://bugs.gentoo.org/142635 reports that the thermal zone 
always reads 40C. Is this something that should be filed at the kernel 
bugzilla for further investigation, or can we simply blame a 
buggy/unfixable BIOS? I understand that i2c/hwmon is the more common way 
of measuring temperatures.

Thanks,
Daniel

Re: /proc/acpi/thermal_zone/THRM/temperature always reports 40C - is this a bug?

[Len Brown]

On Wednesday 11 October 2006 21:03, Daniel Drake wrote:
> Hi,
> 
> Ethan, at http://bugs.gentoo.org/142635 reports that the thermal zone 
> always reads 40C. Is this something that should be filed at the kernel 
> bugzilla for further investigation, or can we simply blame a 
> buggy/unfixable BIOS? I understand that i2c/hwmon is the more common way 
> of measuring temperatures.

Probably this isn't specific to a gentoo build and would happen just
the same with a kernel.org build.  So if it is a bug, it is probably an upstream bug.

However, unless it used to work, or something bad happens,
this is sort of an academic failure.  I suppose if you ran Windows
on the box and it displayed a changing temperature via ACPI
but Linux does not, then it would be more interesting.

It would be good to verify that ACPI events in general
are working on the box -- eg. the power button etc -- as a failure
there would also be more interesting than unchanging temperature.

-Len

Re: /proc/acpi/thermal_zone/THRM/temperature always reports 40C - is this a bug?

[Rafael J. Wysocki]

On Friday, 13 October 2006 07:17, Len Brown wrote:
> On Wednesday 11 October 2006 21:03, Daniel Drake wrote:
> > Hi,
> > 
> > Ethan, at http://bugs.gentoo.org/142635 reports that the thermal zone 
> > always reads 40C. Is this something that should be filed at the kernel 
> > bugzilla for further investigation, or can we simply blame a 
> > buggy/unfixable BIOS? I understand that i2c/hwmon is the more common way 
> > of measuring temperatures.
> 
> Probably this isn't specific to a gentoo build and would happen just
> the same with a kernel.org build.  So if it is a bug, it is probably an upstream bug.
> 
> However, unless it used to work, or something bad happens,
> this is sort of an academic failure.  I suppose if you ran Windows
> on the box and it displayed a changing temperature via ACPI
> but Linux does not, then it would be more interesting.
> 
> It would be good to verify that ACPI events in general
> are working on the box -- eg. the power button etc -- as a failure
> there would also be more interesting than unchanging temperature.

I guess it may be related to http://bugzilla.kernel.org/show_bug.cgi?id=5534

Greetings,
Rafael


-- 
You never change things by fighting the existing reality.
		R. Buckminster Fuller

Re: /proc/acpi/thermal_zone/THRM/temperature always reports 40C - is this a bug?

[Daniel Drake]

Len Brown wrote:
> On Wednesday 11 October 2006 21:03, Daniel Drake wrote:
>> Hi,
>>
>> Ethan, at http://bugs.gentoo.org/142635 reports that the thermal zone 
>> always reads 40C. Is this something that should be filed at the kernel 
>> bugzilla for further investigation, or can we simply blame a 
>> buggy/unfixable BIOS? I understand that i2c/hwmon is the more common way 
>> of measuring temperatures.
> 
> Probably this isn't specific to a gentoo build and would happen just
> the same with a kernel.org build.  So if it is a bug, it is probably an upstream bug.

Agreed - I was asking whether you regard this as a real upstream bug, or 
a broken ACPI implementation not worth fixing.

> It would be good to verify that ACPI events in general
> are working on the box -- eg. the power button etc -- as a failure
> there would also be more interesting than unchanging temperature.

The power button does generate events, so it's not completely broken.

I guess this can just be passed off as a small BIOS bug? If you'd like 
us to open a bug for it anyway, just say.

Thanks!
Daniel