The regression is that the gradient (which didn't appear at all before) now only occupies the middle 50% of the screen. This means it looks squashed and different to the login screen. The top and bottom 25% of the screen are solid colours.
It looks like a problem with texture coordinates and GL clamp-to-edge, since the gradient is really only a 1x2 two pixel texture rendered with linear filtering.
I found the problem yesterday.
The regression is that the gradient (which didn't appear at all before) now only occupies the middle 50% of the screen. This means it looks squashed and different to the login screen. The top and bottom 25% of the screen are solid colours.
It looks like a problem with texture coordinates and GL clamp-to-edge, since the gradient is really only a 1x2 two pixel texture rendered with linear filtering.