How to adjust the brightness of the Linux desktop?
Please click on the lower left corner of the icon (Start button), open the System Settings, open the Power Management.
In the energy saving option, in the adjustment of the corresponding power state display brightness option.

Adjust the levels in the button represents the brightness of the position. After setting, click Apply.
In the energy saving option, in the adjustment of the corresponding power state display brightness option.

Adjust the levels in the button represents the brightness of the position. After setting, click Apply.