Please refer to the steps below:
1. Press the brightness button on the keyboard to switch the brightness setting.
2. Select the Auto option to enable LCD automatic adjustment or select the Brightness option to disable LCD automatic adjustment.
To make adjustments of the brightness under the Luminous sensor function, please go to Sony Notebook Setup and follow the steps below.
The following settings will take effect only using the Luminous sensor function:
1. Click Sony Notebook Setup and then click Automatic Brightness.
2. Perform the desired settings (Five levels are available) and then click OK.
Note:Please refer to the Online Manual for the procedure to customize the display through LCD brightness adjustment.