Hi, I have been thinking what it possibly could be. It seems like there might be two reasons: 1) the board is equipped with some kind of remote management conroller, which is also doing transactions on I2C Is there some? 2) the SMM mode is doing its own i2c transactions, interfering with the driver. The problem is that SMM iss transparent to OS.The only thing could possibly done is a BIOS change, or one could add some code to acquire global ACPI lock. It would require to modify the driver and add there those functions. 3) Make a driver more bullet proof. Maybe it would be possible somehow to force the driver to have a longer timeouts, more retries etc. I would still need to know how often this problem actually happens. Thanks, Rudolf
