Not sure if anyone else found this problem or only me. If you disable auto brighness setting and also change the power saver mode to performance mode, the screen will still keep on changing the brightness randoomly. Sometimes enter into Chrome the brighness will reduce ,after a while the brighness will back to normal. This happens randomly even sometimes in the desktop. Even now I'm typing in this forum l, the screen also changes itself. I'm on Huawei's latest official firmware and no root. Please report here if you have the same problem or you have any solution on it.