Ok, I am going to try this. Did you use this image: http://sjoerd.luon.net/posts/2015/02/debian-jessie-on-rpi2/ I have installed it. It is on 3.18.5 How did you get to 4.1.7? Did you use some unstable repository/which one? And then you installed 4.1.7-rt8 the way Mikhail described? Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html