Hi Laurent yes, I tried with saturation=137 and gamma=100, but no success. Unfortunately I am not so familiar with sniffing USB traffic, but I could try to send you a file captured with wireshark, when switching on the camera in Windows. Only thing I have to figure out, how to filter out required traffic, since it might be a very long file otherwise. Would this be ok for you? Regards Aurel -- 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