No, I'm working with the Yocto project. In Yocto, using V4L2, the RealSense RGB camera is /dev/video13, the separate RGB camera is /dev/video2, input=0 and the optical flow monochrome camera is /dev/video2, input=1. I don't know how they are assigned in Ubuntu.
Ok, thank you.
That is the only explanation I can think of too. I will mark this thread as answered. Please let me know if you need any further assistance.