I have a system with an Asus P5L-VM 1394 motherboard on which I installed "lm_sensors". When I run the "sensors" command, I get:

lm78-isa-0290
Adapter: ISA adapter
VCore 1: +2.30 V (min = +2.85 V, max = +3.15 V)
VCore 2: +3.62 V (min = +2.85 V, max = +3.15 V)
+3.3V: +3.34 V (min = +3.14 V, max = +3.47 V)
+5V: +5.62 V (min = +4.76 V, max = +5.24 V)
+12V: +0.30 V (min = +11.37 V, max = +12.59 V)
-12V: -10.85 V (min = -12.63 V, max = -11.40 V)
-5V: -3.71 V (min = -5.25 V, max = -4.74 V)
fan1: 3082 RPM (min = 9375 RPM, div = 2)
fan2: 8881 RPM (min = -1 RPM, div = 1)
fan3: 0 RPM (min = 51923 RPM, div = 2)
temp: +26.0°C (high = +24°C, hyst = +8°C)
vid: +3.00 V

As far as I can tell, all those values are correct, but there's no CPU temperature. I even checked in "/proc/acpi/thermal_zone", but that directory is empty. I know the motherboard has an accurate CPU temperature sensor, because it's displayed in the BIOS.

Any idea what I might be doing wrong?

Thanks

Do you have the latest version of lm-sensors installed although I think you may need to go too the LM-Sensors and sign up for the mailing list to see if they can help as your motherboard + lm-sensors only yields a single hit on Google with no useful information.