Debug Xbox One Controller Issues
There is a weird issue with Xbox One controllers on the Windows version, that makes the camera drift down. It works fine on a 360 controller, so I erroneously thought that the Xbone controller would be fine as well, but it doesn't look like it. Darkplaces has the same glitch when using standard Quake joystick settings instead of the Xbox 360 controller specific ones. Might be related to DirectInput or something, but I'm not sure. Please look into this anomaly. Might just be a settings issue, but I doubt it