[Apologies. There seem to be a number of posting close to this subject. Trying to get a definitive view]   So, with the 3.4.113 kernel the gc2035 driver fails when trying to identify the sensor. The problem lies in the sensor_init function where a read of the I2C/CCI bus fails. Before I break out the breakout board can anyone verify these basics please?   I've tried the various suggestions for setting one of the GPIO pins prior to loading the modules but to no avail.