Date: Mon, 1 Oct 2007 20:40:27 +0200 From: Milan Bartos <merlyn500@gmail.com> To: "Kevin Oberman" <oberman@es.net> Cc: freebsd-acpi@freebsd.org Subject: Re: Prestigio Nobile 157 ACPI - overheating Message-ID: <200710012040.28160.merlyn500@gmail.com> In-Reply-To: <20071001181852.879B645010@ptavv.es.net> References: <20071001181852.879B645010@ptavv.es.net>
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Thank you very much for this comprehensive information about processors. I will try clean my laptop (he is more than 2 years old). And i will be calmer (quieter ?). So once again thank for Your instructions and Your time. Milan Dne Monday 01 of October 2007 20:18:52 Kevin Oberman napsal(a): > > From: Milan Bartos <merlyn500@gmail.com> > > Date: Mon, 1 Oct 2007 19:03:15 +0200 > > Sender: owner-freebsd-acpi@freebsd.org > > > > Hi. I have laptop Prestigio Nobile 157 and i am running 6.2-STABLE. > > Kernel is GENERIC. I have my proc dev.cpu.0.freq=1000 to have temperature > > about 54 Celsius. If a have dev.cpu.0.freq=1700, temperature is over 70 > > Celsius. Is this bug, unsuported acpi device or attribute my laptop? > > My dmesg following: > > [-snip-] > > > Please, help me, all you will need (some sysctls or anything else) i > > will send you. > > OK. People need to learn a bit about the normal temperatures of modern > CPUs (as well as how they are measured). > > You have a 1.6GHz Pentium-M. The CPU temperature is measured on the > silicon by a single junction that is tied to two pins on the > package. The temperature you see is going to be higher than whet you saw > on many older systems with a temperature sensor mounted under the CPU in > the socket. These showed a lower temperature due to the combination of > convection and thermal conduction. > > Your CPU is most likely a 735. If so, it is speced for operation to 100C > and thermal shutdown forced at 125C. 70C is not really all that hot. My > system tends to idle at about 55C and, during a big build > (e.g. buildworld or openoffice.org) will climb to about 85C. This is higher > than I used to see, but I suspect I need to remove the keyboard and > clean the heat sink. Dust accumulation can really impact thermal > transfer and the laptop is now 2.5 years old. > > Really, what you are seeing is pretty normal. You can see what the > vendor thought was too hot by looking at 'sysctl hw.sysctl.thermal'. > Look at values for PSV and CRT. PSV is when the system should start > aggressive thermal control by forcing the performance down. CRT is when > the systems should alarm and, depending on configuration, start a > shutdown. > > On my 2G Pentium-M I see: > hw.acpi.thermal.tz0._PSV: 94.5C > hw.acpi.thermal.tz0._CRT: 99.0C > > So even 80C is not excessive. Just very uncomfortable if you really have > the laptop on your lap.
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