Not a super advanced user so take all of this at your own risk I also have a Gigabyte board - gigabyte z270mx gaming   So using sensors-detect this is the only module detected other than coretemp ITE IT8686E Super IO Sensors (address 0xa40, driver 'to-be-written')   I used this command to force load the it87 driver under a different an ID which it recognised which works correctly with the IT8686 chipset (for me) modprobe it87 force_id=0x8628 This got my PWM fan
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