From: Francisco F. Jr. <fxj...@ya...> - 2005-08-01 01:25:12
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Jamie Lentin wrote: >>I don't know for sure, since I don't understand why your system starts >>active cooling at 52 C (instead of 50 C) -- maybe there's hysteresis >>in the hardware? And why does it have to get way down to 44 C instead >>of only 50 C before turning off? > > > There is probably hysteresis built into the DSDT. The ACPI Spec > suggests doing this (don't have a page # handy tho', sorry), it's how > hysteresis is implemented on my laptop (as well as yours---atlhough the > hysteresis code is probably broken as it was on mine. I'm preparing a > page in the DSDT fixes/rewrites I've done on my laptop, if you're > interested. Your 600x DSDT code seems pretty much identical to my 770x > code). > > Basically, whenever there is a change in fan state, the DSDT can trigger > the OS to re-read the trip-points from the DSDT, and give lower values. > Again, once the fan turns off, it can tell the OS to re-read, and give > higher trip-point values. > Ahhhh, nice catch! I never watched my trip points when fan was on. This is what I get: cat /proc/acpi/thermal_zone/THRM/trip_points critical (S5): 93 C passive: 90 C: tc1=2 tc2=3 tsp=100 devices=0xdf6de240 active[0]: 70 C: devices=0xc147fe00 active[1]: 60 C: devices=0xc147ff20 active[2]: 45 C: devices=0xc147ffe0 Indeed, my active[2] was changed to 45 C. As I get my fan turned off when it reaches 42, 41C I think it has the hysteresis already in my dsdt as Jamie said. This would explain why values when fan is on or off changes sometimes. I mean, sometimes my fan starts with 51C, other times with 52C. The same happens when turning off. Thanks guys for this one more information. - -- Regards, Francisco Figueiredo Jr. Npgsql Lead Developer http://gborg.postgresql.org/project/npgsql MonoBrasil Project Founder Member http://monobrasil.softwarelivre.org - ------------- "Science without religion is lame; religion without science is blind." ~ Albert Einstein -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iQEVAwUBQu2CFv7iFmsNzeXfAQKm9gf/dtcvDM7ijfryGUd9uJr/A5HBA178AQ9J MLDUzoVZBcF09SHLk4Oa6b0rqmMpfXiQ4n+Smai9zhwpysY66pcR8JFXHDqXow+K xpEAO91aE34VAYObcBS0WTWZd/5AIBDNzztV26Kaykn/Yp8JR618U94kSjU0k/ot fMqMKJq8IkvsJINxqst6fbHya/IuPSEg1XR6IwAR1DQML3dmXAWFeJiuYx4hrUDd yGU0rR+H369KzGU8Fqexo+aWPLw3beKcF15EGpYea9fwNNGqixEjbB19Cs7vr7z2 7UAn4ZTIX/aQn8rbsXrcn30jlbXNHIkk3k9ziLBKE6ve1IQxVreeYA== =VN0U -----END PGP SIGNATURE----- _______________________________________________________ Yahoo! Acesso Grátis - Internet rápida e grátis. Instale o discador agora! http://br.acesso.yahoo.com/ |