Yah I don't agree with having to put beta software on it either. That's why I'm trying the cable route. Understood that you don't have the cable either, I just wanted to put it out there in the hopes that an Apple person sees it and sees that so far reliably the cable is having problems. It may be only some of the cables, but I believe they shipped out either faulty cables, or there's an issue with some of the cables and ios 9.1. Not sure which yet. I haven't tried it with an iphone 6s cable yet but wanted to make the point that I was using the apple tv 4 cable so that there was clarity with which cable I've been having success with knowing that every time I use the INCLUDED ipad pro cable it causes the black screen lockup forcing a hard reset, but using the specific apple tv 4 cable is not causing this issue. (It may also have to do with the length of the cable since the ipad pro one is much longer than an iphone or apple tv 4 remote charging cable).
My main point also in doing this is because I spent a terrible week with a surface book pro with all kinds of video driver app problems and shutdowns and NEVER found a solution, thus returned it. To date I still haven't seen anyone come up with any reliable solutions, nor has MS fixed it yet. I'm hoping Apple's IOS 9.2 is the software fix that does actually fix it, otherwise, they need to do a cable replacement or recall for the ipad Pro because I'm 98% positive that's the issue. Also, these are not the normal serial like cables of old. There's a lot more technology involved in the actual cables, and they're not just a couple of wires strung through some rubber so Apple needs to look at it and hopefully fix that.
Also, my point in posting this is to hopefully show that this issue isn't a show stopper and can most likely be fixed if Apple replaces the cables, swaps them out, or does something as simple as that. Hopefully this will get to the Genius Bar so that they can test it, verify it, and start helping people who come in with this problem with an actual solution.