Date: Wed, 09 May 2012 12:56:19 +0100 From: Chris Whitehouse <cwhiteh@onetel.com> To: freebsd-questions@freebsd.org Subject: Re: ACPI temprature settings [WAS: Re: laptop very hot and noisy] Message-ID: <4FAA5B63.3010307@onetel.com> In-Reply-To: <20120508140604.GA12758@mech-cluster241.men.bris.ac.uk> References: <20120501120654.GA4883@mech-cluster241.men.bris.ac.uk> <CAHieY7QW=3AJg4pO3reV76eC8URMQU0uoFQrv1BJdDskrX7gCw@mail.gmail.com> <20120501124110.GB5007@mech-cluster241.men.bris.ac.uk> <4FA032AE.8050902@onetel.com> <20120508140604.GA12758@mech-cluster241.men.bris.ac.uk>
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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
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