System extremely slow under light load
freebsd at chillt.de
Mon Apr 25 13:21:24 UTC 2011
> I am not sure tz0 is the real thermal zone, especially given values
> of _tc1, _tc2 and _tsp. Temperature value (3001) looks suspicious as
I agree. tz0 looks entirely bogus. There is no second fan to control for
it and I have no idea what it is supposed to be monitoring.
> Can you, by any chance, put your ASL someplace accessible and provide
> a description of what you have done to fix the temperature
Certainly. I have uploaded the files at  through .
The DSDT source returned by acpidump -d is at . I modified this so
that it can be compiled back into AML without errors or warnings. This
modified source is at . It contains no functional changes. The
thermal zones are still broken. A variant with fixed tz1 is at .
For convenience, I have also uploaded diffs between these source files.
 is the diff required to make the source compile (difference between
 and ).  is the actual change I made to fix tz1 (difference
between  and ). As you can see, all I did was to remove a bogus
function that ends up always returning 0°C.
> As the side note: I have seen and do own pieces of equipment that
> use thermal zones to initiate critical shutdown for various and
> unrelated reasons.
In my case, the thermal zone and its various tripping points do
correspond to the actual system fan. It is just that the BIOS enforces
power management itself, ignoring ACPI - except for critical shutdown
which appears to be triggered by ACPI only.
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