[gradinaruvasile]

I had the same issue with the sensors and it may vary from motherboard to motherboard. You may need to do a sensors and see if you can parse the data yourself.

The last time I built this mobo with Raring, sensors-detect only picked up one sensor. This last install I have two and clearly one is GPU and one is CPU (both labelled temp1 but they're far too low to be real temps. They do say +8 c so I'm wondering if there's a base I need to add to the number shown, any ideas?

radeon-pci-0008
Adapter: PCI adapter
temp1: +8.0°C (crit = +120.0°C, hyst = +90.0°C)

k10temp-pci-00c3
Adapter: PCI adapter
temp1: +8.6°C (high = +70.0°C)
(crit = +80.0°C, hyst = +79.0°C)

These 2 temps are provided by the k10temp module which extracts it from the CPU's internal sensors and the radeon module-provided temperatures extracted from the video cards internals. On all my mobos i had these were off (although some pci cards seem to report real-looking values) - AFAIK, especially in the case of APUs these arent "real" temperatures, they are values used internally for thermal throttling - on low or no load, they have very unprecise values and they come closer to "reality" when there is load on the components and temps raise.

Now, mobos have a thermal monitoring chip (mostly IT8xxx series) that collects CPU temperatures, fan speeds and voltage levels from various sensors and the BIOS uses it to decide on throttling and stuff. These readings are provided as "real" values (and are the same that you see in the BIOS/UEFI).
Sadly, not all are supported under Linux and it seems they will not add newer models since ITE doesnt share diagrams anymore. For example the Gigabyte GA-F2A85X-D3H mobo has an IT87xx chip that shows all these informations, but the GA-F2A88X-D3H has some IT8620 chip that isnt supported (my case) and is imited only to the k10temp and radeon values.

I dont know if the values provided by radeon and k10temp can be changed and anyway, because of their non-linear nature, multiplying them with some arbitrary value probably wont help anyway. In my case they are at 0 or below 0 when idle.