Ok, 3x works, but not 2X, that's weird.
So in order and without mod : 1x, 2x and 3x. As you can see, 3x is really sharp, maybe too much, but 2x is terrible while 1x is pretty good (at least on my 1440p monitor).
So scaling works, but not with 2x.
Unfortunately, it doesn't change the fact...