Re: ACPI Exception (AE_ERROR, ACPI thermal trip point state changed)

[Len Brown <lenb@kernel.org>]

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On Wed, 22 Apr 2009, Marcin Gozdalik wrote:

> Hi
> 
> I am seeing the following in logs:
> 
> Apr 22 16:00:07 myth kernel: [   39.354031] ACPI Exception
> (thermal-0479): AE_ERROR, ACPI thermal trip point state changed
> Apr 22 16:00:07 myth kernel: [   39.354040] Please send acpidump to
> linux-acpi@vger.kernel.org
> Apr 22 16:00:07 myth kernel: [   39.354045]  [20080926]
> 
> I am using Ubuntu 9.04:
> 
> root@myth:/home/gozdal# uname -a
> Linux myth 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:58:03 UTC
> 2009 x86_64 GNU/Linux
> 
> Motherboard is Abit AN-M2HD(MCP68) flashed with the latest BIOS.
> 
> The machine powers down sometimes because of an ACPI trip point:
> 
> Apr 22 17:27:19 myth kernel: [ 5272.004934] ACPI: Critical trip point
> Apr 22 17:27:19 myth kernel: [ 5272.004952] Critical temperature
> reached (121 C), shutting down.
> Apr 22 17:27:19 myth kernel: [ 5272.004973] ACPI: Unable to turn
> cooling device [ffff88006f841800] 'on'
> Apr 22 17:27:26 myth kernel: [ 5278.204238] Critical temperature
> reached (34 C), shutting down.
> 
> although I believe this is an error in measurement, as the temperature
> probably wouldn't cool in 7 seconds from 121 to 34 Celsius.

did this happen with earlier kernels, or did it start in 2.6.28?

please try 2.6.29.
please try it with CONFIG_HWMON=n

If it still fails, please file a bugzilla
http://bugzilla.kernel.org/enter_bug.cgi?product=ACPI
and attach the acpidump there.

thanks,
Len Brown, Intel Open Source Technology Center