From owner-freebsd-hackers@FreeBSD.ORG  Mon May 14 23:20:35 2012
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From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Aryeh Friedman <aryeh.friedman@gmail.com>
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Date: Mon, 14 May 2012 17:19:26 -0600
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Cc: Bartosz Fabianowski <freebsd@chillt.de>,
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Subject: Re: diagonising a overheating problem
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On Mon, 2012-05-14 at 18:56 -0400, Aryeh Friedman wrote:
> On Mon, May 14, 2012 at 6:37 PM, Bartosz Fabianowski <freebsd@chillt.de> wrote:
> > Try sysctl dev.cpu.0.temperature. I have a notoriously overheating Dell
> > laptop and for me, this sysctl always reports the temperature.
> >
> > - Bartosz
> 
> ~/Desktop aryeh@localhost% sysctl dev.cpu.0.temperature
> sysctl: unknown oid 'dev.cpu.0.temperature'
> ~/Desktop aryeh@localhost% sysctl dev.cpu.0
> dev.cpu.0.%desc: ACPI CPU
> dev.cpu.0.%driver: cpu
> dev.cpu.0.%location: handle=\_PR_.C000
> dev.cpu.0.%pnpinfo: _HID=none _UID=0
> dev.cpu.0.%parent: acpi0
> dev.cpu.0.freq: 1500
> dev.cpu.0.freq_levels: 1500/7260 1400/6056 1225/5299 1200/5125
> 1100/4500 1000/4095 900/3753 800/3468 700/3034 600/2601 500/2167
> 400/1734 300/1300 200/867 100/433
> dev.cpu.0.cx_supported: C1/0 C2/100
> dev.cpu.0.cx_lowest: C1
> dev.cpu.0.cx_usage: 100.00% 0.00% last 233us

dev.cpu.0.temperature is provided by the coretemp(4) driver, maybe you
need to kldload it?

-- Ian