Hi all, > Hmm but what device it controls? Some multiplexer? or some other black box > doing nasty things ;) ? More likely it is a multiplexer. Yes, most probably. Philips (and probably others) make I2C multiplexers that can be controlled using GPIOs. > I have a theory that maybe SMM (system management mode code) is blocking > SMBUS controller for time to time, so thatswhy they are always looking if > the bus is busy or not before writing there Is your windows driver doing > same? > > If my theory is correct you should see in your system long on that > motherboards some entries from "i2c-piix4" (whatever it is its name) > complaing about transaction failure, i2c busy etc... This is the i2c-i801 driver. I am not sure that this driver properly handles errors (seems to be a weak point of many drivers in lm_sensors), so maybe this is something that should be improved to help in this specific case. Chunhao, make sure you compile i2c-i801 with debugging enabled, that might help you understand what happens. -- Jean Delvare
