Your processor is a late 2015 release, so that looks fine for use with a R200. I don't see there being any problem there.
As you are using Ubuntu and quote a Librealsense sample name, I'm guessing you are using the open-source Librealsense rather than the official RealSense SDK? Intel does not provide official tech support for Librealsense, though unofficially it is in favor of it, so it may be difficult to get an answer to your problem on this forum. Nevertheless, I will have a look at the problem.
Apparently, others have experienced this issue with infrared2 not working too in Ubuntu 16.04. One person suggested " re-running the patch script (noting if anything fails, and remembering to sudo modprobe uvcvideo after)."
It also seems to be an issue that occurs or does not occur depending on the machine you are using - users found that the camera was fine on some machines but did not show infrared2 on other machines. this was believed to be related to the particular USB 3.0 chipset that each machine uses.
Never figured out what the problem was, probably was the patch. I decided to reinstall completly, following the instruction on Git slowly step by step.
Thanks for the help.