Asrock B450-Pro4 and ACPI issues

I have just bought the Asrock B450-Pro4 (with R5 3600 cpu) and i'm struggling with ACPI.

'acpi -V' does not return anything useful:

No support for device type: power_supply
No support for device type: power_supply
Cooling 0: Processor 0 of 10
Cooling 1: Processor 0 of 10
Cooling 2: Processor 0 of 10
Cooling 3: Processor 0 of 10
Cooling 4: Processor 0 of 10
Cooling 5: Processor 0 of 10
Cooling 6: Processor 0 of 10
Cooling 7: Processor 0 of 10
Cooling 8: Processor 0 of 10
Cooling 9: Processor 0 of 10
Cooling 10: iwlwifi_1 no state information available
Cooling 11: Processor 0 of 10
Cooling 12: Processor 0 of 10

CPU temperatures (stock Stealth cooler) are also sensibly higher than those i was used with my previous system (i5-4670): with cpu governor set to ondemand (boost enabled), the idleT is 65C and suddenly rises to 91C when 'stress -c 12' is run.
Dunno if this has to do with lacking of ACPI data...

Do you have any recommendations on how to get ACPI working properly?

Thanks!