Temperature reported wrongly?

Temperature reported wrongly?

[David Sterratt]

There appears to be a discrepancy between the temperature reported by
ACPI and the temperature reported by the "health check" in my BIOS, just
over a minute after rebooting. The value reported by
/proc/acpi/thermal_zone/THRM/temperature is 73 degC as opposed to 51
degC from the BIOS. I'm working on the assumption that the CPU core
can't cool down by 22 degC in under a minute.

Is that assumption likely to be correct?  If so, I suppose it implies a
bug in acpi, I've looked in the bugzilla and googled, but couldn't find
anything similar. 

I'm running a stock 2.6.8 kernel as supplied by Debian. My motherboard
is an MSI MS-6390 with an Athlon XP1800+ CPU and a winbond W83697HF
sensor chip. The temperature sensor is a diode. The BIOS is AWARD v
6.00PG (v1.2) and APIC is disabled in the BIOS (to solve some other
problems with 2.6.x kernels).  

I've considered upgrading the BIOS. There was a problem in earlier
versions of the BIOS about reporting incorrect temperature, but that
seems to have been fixed in my minor version (v1.2)
(http://members.driverguide.com/driver/detail.php?driverid=149547) There
are no changes after v1.2 that might correct the temperature reporting
(http://www.msicomputer.com/support/bios_result.asp; and then select AMD
platform and MSI-6390 -- MSI site won't give sane URL). I'm reluctant to
flash my BIOS, but if people think it might be worth a try I might take
the risk.

I've tried using lm_senosrs, but that gives me the same temperature
(unless I tweak it in sensors.conf).


All the best, and thanks for the ACPI work,

David.



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Re: Temperature reported wrongly?

[David Sterratt]

On Fri, 2005-02-04 at 15:46 +0000, David Sterratt wrote:
> There appears to be a discrepancy between the temperature reported by
> ACPI and the temperature reported by the "health check" in my BIOS, just
> over a minute after rebooting. The value reported by
> /proc/acpi/thermal_zone/THRM/temperature is 73 degC as opposed to 51
> degC from the BIOS. I'm working on the assumption that the CPU core
> can't cool down by 22 degC in under a minute.
> 
> Is that assumption likely to be correct?  If so, I suppose it implies a
> bug in acpi, I've looked in the bugzilla and googled, but couldn't find
> anything similar. 
> 
> I'm running a stock 2.6.8 kernel as supplied by Debian. My motherboard
> is an MSI MS-6390 with an Athlon XP1800+ CPU and a winbond W83697HF
> sensor chip. The temperature sensor is a diode. The BIOS is AWARD v
> 6.00PG (v1.2) and APIC is disabled in the BIOS (to solve some other
> problems with 2.6.x kernels).  
> 
> I've considered upgrading the BIOS. There was a problem in earlier
> versions of the BIOS about reporting incorrect temperature, but that
> seems to have been fixed in my minor version (v1.2)
> (http://members.driverguide.com/driver/detail.php?driverid=149547) There
> are no changes after v1.2 that might correct the temperature reporting
> (http://www.msicomputer.com/support/bios_result.asp; and then select AMD
> platform and MSI-6390 -- MSI site won't give sane URL). I'm reluctant to
> flash my BIOS, but if people think it might be worth a try I might take
> the risk.
> 
> I've tried using lm_senosrs, but that gives me the same temperature
> (unless I tweak it in sensors.conf).

I've just discovered (by accident) that this actually appears to be an
lm_sensors problem -- when I don't have the lm_sensors modules in the
kernel, ACPI seems to report the CPU temperature fine. I'll mail the
relevant lm_sensors list. Sorry for the noise.

David. 



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