The bug manifests itself as each V4L camera on the USB bus being presented twice. This is the information I have at the moments on the versions involved:
This problem has been found on Fedora kernels but may be present in other kernels.
Fedora Linux kernel version
4.15.17 Apl 12 works correctly
4.16.4 Apr 24 kernel bug displaying 2 devices
4.16.5 Apr 27 kernel bug displaying 2 devices
In AstroDMx Capture for Linux, the bug shows itself at connect time:
Screenshot of the camera connect dialogue showing the cameras presenting twice
Everything will work fine if the first instance of the device is chosen.
It should be noted that this is a bug in the Linux kernel, not in AstroDMx Capture for Linux.
The bug has been reported to the kernel developers and we shall have to see how long they take to fix it. At the moment one can solve the problem by booting into an earlier version of the kernel, or by simply choosing the first device when two are presented. Cameras that are not V4L cameras are not affected.
Nicola has implemented a workaround to eliminate this problem. It will be present in the next release of AstroDMx Capture for Linux.
