Found this explanation and solution on the Internet:

...
lm-sensors appears to have stopped working in Ubuntu Karmic Koala (basically 
for any distro running Kernel 2.6.31). If you look at your Kernel messages, you 
will see something like this:

ACPI: I/O resource it87 [0x295-0x296] conflicts with ACPI region IP__
[0x295-0x296]
ACPI: Device needs an ACPI driver

If you want to restore the old behaviour (which might be dangerous) add:
"acpi_enforce_resources=lax" to the kernel cmdline when booting (or add
it in grub.conf to make this permanent).

To add acpi_enforce_resources=lax to your Grub, in Ubuntu Karmic,

1.press Alt + F2, and enter: gksu gedit /etc/default/grub
2. And enter the following line: GRUB_CMDLINE_LINUX="acpi_enforce_resources=lax"
3. Then save the file.
4. Run this in console: sudo update-grub2

This is copy/pasted from the following link(it is missing step 4):
http://www.webupd8.org/2009/10/make-lm-sensors-work-in-ubuntu-karmic.html

-- 
lm-sensors don't work
https://bugs.launchpad.net/bugs/478762
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