i2c-0 i2c DP-1 I2C adapter i2c-1 i2c DP-2 I2C adapter i2c-2 smbus SMBus PIIX4 adapter port 0 at 0b00 SMBus adapter i2c-3 smbus SMBus PIIX4 adapter port 2 at 0b00 SMBus adapter i2c-4 smbus SMBus PIIX4 adapter port 1 at 0b20 SMBus adapter