Learn how to adjust screen brightness on your Huawei Ascend Mate. You can flick down from the status bar to open the notification panel.
On the home screen, touch Settings icon then the All tab.
Under DEVICE, touch Display.
Touch Brightness.
In the displayed dialog box, perform either of the following operations:
Select the Automatic brightness check box to have your phone automatically adjust its screen brightness based on the ambient light.
Drag the slider left to reduce the screen brightness or drag it right to increase the screen brightness.
You can also flick down from the status bar to open the notification panel and adjust the screen brightness using the switch shortcuts.