enable_smbus();
// smbusx_write_byte(1, (0x58>>1), 0, 0x80); /* select bank0 */
smbusx_write_byte(1, (0x58>>1), 0xb1, 0xff); /* set FAN ctrl to DC mode */
enable_smbus();
// smbusx_write_byte(1, (0x58>>1), 0, 0x80); /* select bank0 */
smbusx_write_byte(1, (0x58>>1), 0xb1, 0xff); /* set FAN ctrl to DC mode */