Date: Mon, 01 Oct 2007 11:18:52 -0700 From: "Kevin Oberman" <oberman@es.net> To: Milan Bartos <merlyn500@gmail.com> Cc: freebsd-acpi@freebsd.org Subject: Re: Prestigio Nobile 157 ACPI - overheating Message-ID: <20071001181852.879B645010@ptavv.es.net> In-Reply-To: Your message of "Mon, 01 Oct 2007 19:03:15 %2B0200." <200710011903.15982.merlyn500@gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
--==_Exmh_1191262732_25579P Content-Type: text/plain; charset=us-ascii Content-Disposition: inline > 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. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: oberman@es.net Phone: +1 510 486-8634 Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751 --==_Exmh_1191262732_25579P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) Comment: Exmh version 2.5 06/03/2002 iD8DBQFHAToMkn3rs5h7N1ERAplTAJ4kgSZxNdPDM+kw7FwhJIyMfyqS+gCeNvGb ltzu5d6W1dohRbu62EMm9+Q= =vIxv -----END PGP SIGNATURE----- --==_Exmh_1191262732_25579P--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20071001181852.879B645010>