Hi, I have been working with the new vloopback device which implements non-standard asynchronous notification. It sends SIGIO signals to the owner of /dev/video[0-9] everytime it needs attention, e.g. data has arrived or configuration has changed. The standard way for this would be the fasync file operation. Unfortunately the V4L videodev.c in 2.2.14 does not implement fasync. Therefore applications cannot control the notification via fcntl :( Is fasync implemented in 2.4 or are there plans to add this feature ? Regards, Marko