ACPI temprature settings [WAS: Re: laptop very hot and noisy]

[Chris Whitehouse]

On 08/05/2012 15:06, Anton Shterenlikht wrote:

> Anyway, this was easier than I expected.
> I removed a lot of dust from the fan
> and the heat sink gills. I also replaced
> the "thermal material".

I prop my mine up off the desk to get better airflow to the fan intake 
which is on the underside. The fan slows down when I lift it up 
indicating it is moving more air.

>
> I rebuilt gcc47 and saw the highest temperature of 75.
> This is on the southern side, so not too bad. The
> noise reduced too.
>
> Now, I'd just like to understand better the
> meaning of these console messages:
>
> May  8 15:00:08 mech-aslap239 kernel: acpi_tz0: _AC3: temperature 64.0>= setpoint 40.0
> May  8 15:00:08 mech-aslap239 kernel: acpi_tz0: _AC2: temperature 64.0>= setpoint 50.0
> May  8 15:00:18 mech-aslap239 kernel: acpi_tz0: _AC3: temperature 64.0>= setpoint 40.0
> May  8 15:00:18 mech-aslap239 kernel: acpi_tz0: _AC2: temperature 64.0>= setpoint 50.0
> May  8 15:00:28 mech-aslap239 kernel: acpi_tz0: _AC3: temperature 64.0>= setpoint 40.0
> May  8 15:00:28 mech-aslap239 kernel: acpi_tz0: _AC2: temperature 64.0>= setpoint 50.0
> May  8 15:00:38 mech-aslap239 kernel: acpi_tz0: _AC3: temperature 64.0>= setpoint 40.0
> May  8 15:00:38 mech-aslap239 kernel: acpi_tz0: _AC2: temperature 64.0>= setpoint 50.0
> May  8 15:00:48 mech-aslap239 kernel: acpi_tz0: _AC3: temperature 65.0>= setpoint 40.0
> May  8 15:00:48 mech-aslap239 kernel: acpi_tz0: _AC2: temperature 65.0>= setpoint 50.0
>
> Where are setpoints defined?
> What's acpi_tz?
> What are AC1, AC2, AC3?
> Which kernel tunables are involved in the
> switching from one fan speed to another
> (assuming AC1, AC2, AC3 are related to fan
> speed in some way)?
>
> I had a quick look at ⌡aacpi(4),
> but none of the above are mentioned.
>
> Many thanks for all your help.
>
Google for "acpi_tz0: _CRT value is absurd,  ignored" and you will find 
a long thread with some hopefully useful pointers. You may need to bone 
up on the ACPI reference and custom ASL's for FreeBSD. I've forgotten 
most of it now but I think you will find references for both of them in 
that thread.

Chris