Just tripped across this one.....
I installed all options when installing RC3, including lm-sensors. However, typing "sensors" in the cli results in:
Can't access procfs/sysfs file
Kernel interface access error
For 2.6 kernels, make sure you have mounted sysfs and libsensors
was compiled with sysfs support!
as root and answer YES on all questions. Post the result.