Inspiron 6400 1505e Can't get passive cooling while in AC power

[Nate Lawson]

Abdullah Ibn Hamad Al-Marri wrote:
> On 1/24/07, Bruno Ducrot <ducrot at poupinou.org> wrote:
>> On Sat, Jan 20, 2007 at 06:07:02PM +0000, Abdullah Al-Marrie wrote:
>> > Hello,
>> >
>> > This laptop has Centrino Duo but I can't get the passive cooling at 
>> all.
>> >
>>
>> Could you please send:
>> sysctl hw.acpi
>> please?
> 
> Bruno,
> 
> Thanks for your kind prompt to make FreeBSD Mobile and ACPI much better.
> 
> Here is the output per your request.
> 
> hw.acpi.thermal.min_runtime: 0
> hw.acpi.thermal.polling_rate: 10
> hw.acpi.thermal.user_override: 0
> hw.acpi.thermal.tz0.temperature: 47.5C
> hw.acpi.thermal.tz0.active: -1
> hw.acpi.thermal.tz0.passive_cooling: 0
> hw.acpi.thermal.tz0.thermal_flags: 0
> hw.acpi.thermal.tz0._PSV: -1
> hw.acpi.thermal.tz0._HOT: -1
> hw.acpi.thermal.tz0._CRT: 126.0C
> hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1

Your BIOS's thermal zone doesn't specify a temperature setpoint for
passive cooling (_PSV == -1).  You can manually override it by setting
one and enabling passive cooling via sysctl.conf:

hw.acpi.thermal.tz0.user_override=1   # Enable override of BIOS values
hw.acpi.thermal.tz0._PSV=100C         # Override passive setpoint
hw.acpi.thermal.tz0.passive_cooling=1 # Enable passive cooling

Just be careful what you set _PSV to -- you don't want it higher than
_CRT (critical temp) for instance.  Once you do manual override, the OS
will let you set any value you want but it gives a warning.

-- 
Nate