Date: Thu, 02 Aug 2007 10:08:33 -0700 From: Nate Lawson <nate@root.org> To: "M. Warner Losh" <imp@bsdimp.com> Cc: acpi@freebsd.org, freebsd-hackers@freebsd.org, ume@freebsd.org, gahr@gahr.ch Subject: Re: [patch] enhance powerd(8) to handle max temperature Message-ID: <46B20F91.5080709@root.org> In-Reply-To: <20070801.211718.1683324313.imp@bsdimp.com> References: <46AE58B5.3080506@gahr.ch> <yge4pjl1i7f.wl%ume@mahoroba.org> <46AE8F78.1060203@root.org> <20070801.211718.1683324313.imp@bsdimp.com>
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M. Warner Losh wrote: > In message: <46AE8F78.1060203@root.org> > Nate Lawson <nate@root.org> writes: > : Hajimu UMEMOTO wrote: > : >>>>>> On Mon, 30 Jul 2007 23:31:33 +0200 > : >>>>>> Pietro Cerutti <gahr@gahr.ch> said: > : > gahr> My patch is really just a first draft that I wrote in order to have > : > gahr> feedbacks on the general idea to implement a temperature controlling > : > gahr> system inside powerd, and doesn't implement hysteresis as you noted, and > : > gahr> your feedback is that it's not a good idea, which I respect. > : > > : > It is rather backward, IMHO. I did implement a passive cooling > : > feature as an enhancement of powerd(8) like you did, during initial > : > phases. Then, I implemented it in our kernel as a result. > : > : I'll take a look at your patch. Umemoto-san is right in that you really > : want the kernel to control cooling. What happens if powerd dies/hangs > : and your system burns up? Passive cooling is often a last resort to > : keep the system from overheating. > > I keep getting the system shutting down on my HP by FreeBSD because > the temperature exceeds the _CRT value. Maybe there's something wrong > with my values, since it happens a lot: > > hw.acpi.thermal.min_runtime: 0 > hw.acpi.thermal.polling_rate: 10 > hw.acpi.thermal.user_override: 0 > hw.acpi.thermal.tz0.temperature: 0.0C > hw.acpi.thermal.tz0.active: -1 > hw.acpi.thermal.tz0.passive_cooling: 1 > hw.acpi.thermal.tz0.thermal_flags: 0 > hw.acpi.thermal.tz0._PSV: 90.0C > hw.acpi.thermal.tz0._HOT: -1 > hw.acpi.thermal.tz0._CRT: 94.0C > hw.acpi.thermal.tz0._ACx: 40.0C -1 -1 -1 -1 -1 -1 -1 -1 -1 > > Note: temperature is always 0.0C. > > What can I do to help my situation, if I really want the kernel doing > the cooling? Your embedded controller is timing out. Thus you're getting a bogus value for _TMP. Those settings for _CRT appear correct. It's the "measured" temperature that is wrong. -Nate
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