How to adjust the brightness of the screen if no PowerPanel function is available?

To adjust the brightness of the screen if no PowerPanel function is available.

Please refer to the steps below to adjust the brightness of the screen:

A. To increase the brightness of the screen
Press the Fn + F5 keys.
Brightness level will increase in the order of Low, 4th, 7th and High.
* For PCG-FR series, the above sequence continues in a loop when the keys are pressed repeatedly.

B. To decrease the brightness of the screen.
Press the Fn + Shift + F5] keys.
Brightness level will decrease in step by step reductions.