-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Le samedi 19 F?vrier 2005 16:32, vous avez ?crit?: > Jean Delvare wrote: > > That makes sense, but I'd guess the fan only uses 0.5W of power or so. > > If you set the PWM to a 50% duty cycle you'll save 0.25W. Out of the > > 25W your laptop must be consumming, it's not much, only 1%. Still I > > agree that whatever you can save, should be. But actually I think it's > > more interesting for the noise reduction than for the power consumption > > reduction. > > Don't know how big the fan is, a 40mm fan is typically rated at 1.2-1.4W. > This is significant and I suspect a lot more than 2% of a laptop's power > when it is not doing anything. Fan control is an important part of > any laptop's power management. > > Also, fan power is not proportional to PWM percentage or RPM; > a fan running at half speed could use 1/4 or less of its full-speed power. Understood, you gave me a good advice. > > >>Should i use something like : > >> > >>set pwm1_zone 123 > >> > >>in /etc/sensors.conf in the appropriate section (lm85 and co...), as > >>explained at the end of your linked document ? > > > > You may need to. Zones define which temperature sensors determine the > > speed of a given fan. I'd hope that your BIOS already configured the > > zones properly, but maybe not. At any rate, be very careful when chaning > > this. If you configure the zones improperly, the fans may stop speeding > > up properly on temperature increase (obviously), possibly causing > > permanent damage to your hardware! > > agreed, if you break the feedback loop with the wrong correlations bad > things could happen. Ideally you should figure out what the BIOS or windows > does and make sure to set it up the same way under linux. Be very careful. Thanks for warning me. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFCF6wPoBxdxgioZBIRAskyAJ9yzZB7T5yHFLmSsb2BgVCgtErtrQCgpdWB kbXDe+cfLHYI1QtpNzz6eYY= =wU4I -----END PGP SIGNATURE-----
