One of the criticisms in reviews of the phone was when placing the screen brightness in manual mode, the adjustment slider could really dial in brightness at low brightness setting. At the higher end of the brightness adjustment range, however, it was difficult to set. It was all "bunched up" at the right end of the slider...going from a lower mid-level setting to full brightness very quickly.
I went to BB today to check it out for myself, & indeed there is a problem. Have Huawei fixed this with an update?