So, after much investigating, the root of the High IRQ usage turned out to be kernel-power-settings package, no matter if I have loaded default or my custom oc/undervolt profile...Uninstalling it lowered IRQ usage. Also some daemons like openntpd and advanced power monitor rise up IRQ usage. But still i2c_omap is producing like ~200 activities(170 at the best scenario) and yours is ~90. When I reflashed the device the first thing I did is check i2c_omap IRQ and it was ~130. How come yours is 90? How can I trace it furthermore? Can it be hardware issue?