According to the spec it is """A control which performs an action when set. Drivers must ignore the value passed with VIDIOC_S_CTRL and return an EINVAL error code on a VIDIOC_G_CTRL attempt.""" I don't get what this means. It is no boolean. It has no effect, and you cannot set it? I am probably missing something. Please help. (please answer to all (me in the cc) since I am not a member of this mailinglist regards Ronny -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html