[lm-sensors] w83781d - Unable to set fan1_div

Jean Delvare khali at linux-fr.org
Wed Sep 2 14:56:16 CEST 2009

On Fri, 14 Aug 2009 06:09:41 +0900, clubsoda at hushmail.com wrote:
> Board is ASUS P4T requiring i2c-i801 and w83781d modules, with 
> sensors reporting as99127f-i2c-0-2d.  Tried setting fan1_div, 
> fan2_div and fan3_div to 8 in sensors3.conf and sensors.conf but 
> even after reboot div=2 so the minimum reportable fan speed is 2657 
> RPM.

In order to set the new limits you must run "sensors -s" as root. It's
in the FAQ.

Rebooting will not help at all, quite to the contrary: settings are
almost always lost on reboot, so you have to run "sensors -s" again.
Some distributions include this step in their init scripts, some do not.

> BIOS is not too great at displaying low fan speeds either but ASUS 
> Probe in Windows goes down to 900 RPM or lower so the hardware is 
> capable.
> Xubuntu Karmic alpha 3 system plus all updates.
> sensors, libsensors v3.0.2
> kernel 2.6.31-5-generic

Jean Delvare

More information about the lm-sensors mailing list