Public bug reported:
The algorithm driving fan control is described in the manpage, including
the following statement about the actual mapping from temperature to fan
speed:
"Currently the speed increases quadratically with rising temperature."
However the following function seems to be used by the fancontrol
shellscript:
line 442:
pwmval="(${tval}-${mint})*(${maxpwm}-${minso})/(${maxt}-${mint})+${minso}"
This however does look like a linear mapping, especially the (tval -
min) / (max-min) part. Therefore I suggest to either correct the manpage
or to change the way the value is calculated. Upstream says the manpages
are not up-to-date (http://www.lm-sensors.org/wiki/Documentation).
ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: fancontrol 1:3.1.2-2
ProcVersionSignature: Ubuntu 2.6.32-21.32-generic 2.6.32.11+drm33.2
Uname: Linux 2.6.32-21-generic x86_64
Architecture: amd64
Date: Thu May 6 14:32:47 2010
InstallationMedia: Xubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
PackageArchitecture: all
ProcEnviron:
LANG=de_DE.utf8
SHELL=/bin/bash
SourcePackage: lm-sensors-3
** Affects: lm-sensors-3 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug lucid
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Manpage is not consistent with actual behaviour
https://bugs.launchpad.net/bugs/576369
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