Date: Tue, 31 Jul 2007 07:35:20 +0200 (CEST) From: ports@fsck.ch To: "Nate Lawson" <nate@root.org> Cc: acpi@freebsd.org, freebsd-hackers@freebsd.org, Pietro Cerutti <gahr@gahr.ch> Subject: Re: [patch] enhance powerd(8) to handle max temperature Message-ID: <46976.62.2.233.2.1185860120.squirrel@secure.socket.ch> In-Reply-To: <46AE8F78.1060203@root.org> References: <46AA0491.5000203@gahr.ch> <yge7iol6zb8.wl%ume@mahoroba.org> <46ADAF5B.6050602@gahr.ch> <20070730180355.GA7355@rot26.obsecurity.org> <46AE58B5.3080506@gahr.ch> <yge4pjl1i7f.wl%ume@mahoroba.org> <46AE8F78.1060203@root.org>
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> 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. Something like that happened to me once. I was playing around with the thinkpad fancontrol utility and I turned the fan off. I started a buildworld, forgot to turn the fan back on, and went to bed. The next morning, the laptop was shut down, and I had a syslogged message along the lines "CPU temp is 100 dec c, emergency shutdown". I don't know the exact wording, but the 100 dec C was in there. No noticable impact to the system. Whew.
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