The Windows situation is that LR is doing fine, but PS has some particular problem with the APIs. In other words it doesn't work. This is the subject of many heated threads on the Adobe PS forum, although half the posts are from people who are perfectly happy just scaling the whole thing up in one go. It would seem a high-resolution display is wasted on these people anyway.
According to Chris Cox, senior engineer and forum regular, they're "working with Microsoft" to resolve it, no reason to doubt that, but no timeline promised.