Hi Alan, As you have told, i have executed pm_request_resume() function from my interrupt handler, and it is waking up my USB device. I have implemented all this functionality in class driver(cdc-acm.c). but what is happening is after 2-3 times, ausosuspend is getting disable for my device. I want autosuspend to be enabled for usb device forever. Do pm_request_resume function causes this behavior? Thanks, Jagdish Gediya -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html