Date: Tue, 8 Dec 2009 04:10:00 +0900 From: Taku YAMAMOTO <taku@tackymt.homeip.net> To: freebsd-acpi@freebsd.org Subject: Re: ACPI temperature Message-ID: <20091208041000.1d2f75f8.taku@tackymt.homeip.net> In-Reply-To: <200912042337.04403.freebsd@insightbb.com> References: <200912042337.04403.freebsd@insightbb.com>
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On Fri, 4 Dec 2009 23:37:04 -0500
Steven Friedrich <freebsd@insightbb.com> wrote:
> I sent this to questions last Sunday, but only one person responded. He's
> running FreeBSD 8 and I think his system is reporting bogus temps too.
> I think there might be a missing scaling factor. I'm a hardware guy, but I
> don't currently have temperature measuring equipment and I would want to do it
> on one of my towers (which are currently in storage), not my laptop anyway.
>
> I booted my HP Pavilion zd8215us and I immediately invoked chkCPUTemperature.
> The first temp reported was 52C, which is 125.6F. This leads me to believe
> that acpi has an anomaly regarding temperature measurement. The ambient temp
> was 71F (21.6C). The machine had been off for over eight hours.
I'd suggest to kldload coretemp.ko for another point of view; because it
directly retrieves the core temperature from MSR - no ACPI involved.
We can read the core temperature via sysctl dev.cpu.0.temperature like this:
% sysctl dev.cpu.0.temperature hw.acpi.thermal.tz0.temperature
dev.cpu.0.temperature: 58.0C
hw.acpi.thermal.tz0.temperature: 46.0C
This is obtained from my ThinkPad X60 running in 19C (66.2F) ambient for 15
minutes with the lid closed, powerd running, C2 state enabled.
As others stated already, I too think 52C is not so high to worry, though.
# I think it is very convenient to have a knob (or better, honors LANG) to
# let sysctl show "IK" oids in Fahrenheit.
--
-|-__ YAMAMOTO, Taku
| __ < <taku@tackymt.homeip.net>
- A chicken is an egg's way of producing more eggs. -
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