Comment 1 for bug 462902

Same here, it87 sensor chip on the MB, fan speed not accessible.
Looks like a kernel problem:

[ 1286.459427] it87: Found IT8716F chip at 0x228, revision 1
[ 1286.459443] it87: in3 is VCC (+5V)
[ 1286.459446] it87: in7 is VCCH (+5V Stand-By)
[ 1286.459520] ACPI: I/O resource it87 [0x22d-0x22e] conflicts with ACPI region IP__ [0x22d-0x22e]
[ 1286.459528] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver

and of course fancontrol cannot find pwm sensors and the fan is running at full speed.