[Bug 199812] ACPI: Unable to turn cooling device [ffff81007ffa6810] 'on' is spewed repeatedly on the console

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https://bugzilla.redhat.com/show_bug.cgi?id=199812





--- Comment #27 from John Guthrie <guthrie at counterexample.org>  2009-05-14 04:14:58 EDT ---
(In reply to comment #25)
> Output of acpitool on my system exhibiting the behavior:
> 
> # acpitool -t
>   Thermal zone 1 : passi, 65 C
>   Trip points : 
>   ------------- 
>   critical (S5):           200 C
>   passive:                 50 C: tc1=4 tc2=3 tsp=60 devices=0xffff8800012372b0 
>   active[0]:               50 C: devices=0xffff880000f7b990  

Here is the output on my system:

leibniz_1008% acpitool -t
  Thermal zone 1 : passi, 39 C
  Trip points : 
  ------------- 
  critical (S5):           100 C
  passive:                 -248 C: tc1=4 tc2=3 tsp=60 devices=CPU0 
  active[0]:               -266 C: devices= FAN 

Note the temperatures that are approaching absolute zero.

One fix that was given all the way back in the URL in comment #7 seemed to
indicate that at one time, you could simply echo trip points that were more
sane into /proc/acpi/thermal_zone/THRM/trip_points.  At one time, this
workaround did seem to work.  However, it stopped working when that file was
made read-only.  Does anyone know why the trip_points file was made read-only
and why the trip points seem to be reading so ridiculously low?

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