In the module-configuration file for lm_sensors - e.g. under Mandrake 10.1 /etc/sysconfig/lm_sensors
Gentoo /etc/conf.d/lm_sensors
make sure the following modules are configured to be loaded. You'll require lm_sensors-2.9.1 at least for the display of sensor informations to be correct.

MODULE_0=i2c-viapro
MODULE_1=i2c-isa
MODULE_2=eeprom
MODULE_3=vt1211

The /etc/sensors.conf file has to be as in the attached sensors.conf file.