Date: Wed, 25 Mar 2009 09:06:35 -0700 From: Nate Lawson <nate@root.org> To: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> Cc: freebsd-acpi@FreeBSD.org, Ian Smith <smithi@nimnet.asn.au>, Chris Whitehouse <cwhiteh@onetel.com> Subject: Re: acpi_tz0: _CRT value is absurd, ignored (256.0C) (was pr kern/105537) Message-ID: <49CA568B.6030305@root.org> In-Reply-To: <1237992462.1297.22.camel@RabbitsDen> References: <49C80E65.9090500@onetel.com> <49C93309.6050708@iki.fi> <20090325140718.J95588@sola.nimnet.asn.au> <49C9EE50.6070507@onetel.com> <1237992462.1297.22.camel@RabbitsDen>
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Alexandre "Sunny" Kovalenko wrote: > On Wed, 2009-03-25 at 08:41 +0000, Chris Whitehouse wrote: >> [Please would you cc me in any reply as I'm not subscribed, thanks.] >> >> Ian Smith wrote: >>> On Tue, 24 Mar 2009, Pasi Parviainen wrote: >>> > Chris Whitehouse wrote: >>> > > Hi, I sent this a while ago but don't think there was a reply. I'm about to >>> > > embark on a custom ASL to load in loader.conf as per >>> > > http://www.freebsd.org/doc/en/books/handbook/acpi-debug.html but just >>> > > wondering if their might be a 'proper' fix on the way. I do have the latest >>> > > bios installed. >>> > >>> > Loading custom ASL with modified _CRT value for temperature zone in >>> > question will solve the problem, see below for more information. >>> > >>> > > Would it help if I installed 8-CURRENT? >>> > >>> > Probably not, see below. >>> > >>> > > -------- Original Message -------- >>> > > Subject: pr kern/105537 >>> > > Date: Mon, 12 Jan 2009 15:00:49 +0000 >>> > > From: Chris Whitehouse <cwhiteh@onetel.com> >>> > > To: freebsd-acpi@FreeBSD.org >>> > > >>> > > hi, >>> > > >>> > > Please would you cc me in any reply as I'm not subscribed, thanks. >>> > > >>> > > I have the same problem noted in >>> > > >>> > > http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/105537 >>> > > >>> > > of frequent messages saying >>> > > >>> > > acpi_tz0: _CRT value is absurd, ignored (256.0C) >>> > > >>> > > on my HP nc6320 laptop, model RH383ET. >>> > > >>> > >>> > I have HP 6510b and HP 2510p laptops and had same problem with those. >>> > Actual problem is that the ACPI thermal code in kernel does sanity-check >>> > for temperature values, and accepts only values between 0 - 200 Celsius. >>> > To solve the problem you either create custom DSDT which returns 200.0C >>> > value instead of 256.0C for thermal zone in question or increase the limit of >>> > the sanity-check code of ACPI thermal code (src/sys/dev/acpica/acpi_thermal.c >>> > function: acpi_tz_sanity). >>> > >>> > Proper way to solve this in my opinion is to increase the range of >>> > sanity-check function from 0 - 200 Celsius to 0 - 256 Celsius, or at >>> > least provide sysctl variable to disable thermal sanity-checks. >>> >>> Even 200C is absurd, really. That's above the melting point of many >>> types of solder (http://www.rfcafe.com/references/electrical/solder.htm) >>> while 256C exceeds the melting point of _most_ types of solder. I seem >>> to recall that this limit used to be 150C, still hotter than anything >>> you actually want to have anywhere on a computer board. >>> >>> No sense checking sanity to then accept insane values; fix the broken >>> ASL. 256 sounds suspiciously like a byte-swapped value, perhaps? >>> >>> cheers, Ian >>> >> Getting the ASL in the actual BIOS firmware fixed would be great, but I >> tried once to get Asus to correct a byte swapped value without success. >> I don't suppose HP will be any more cooperative but I can try. I will >> have a look at an acpidump tonight. A custom ASL would at least prove >> what is wrong. >> >> Does anyone know what this value is supposed to be measuring? > _CRT method in ASL is supposed to return temperature (in the tenth of > Kelvin) at which you would like to have your computer shut down rather > rapidly. On my ThinkPad X60 it is 97C. > > To be fair, if all you want is to override _CRT, you should be able to > put something to the tune of > > hw.acpi.thermal.user_override=1 > hw.acpi.thermal.tz0._CRT=90C > > in your /etc/sysctl.conf and not deal with the ASL at all. Yes, this is the best way instead of messing with ASL. -- Nate
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