Feature Request: Provide a brightness setting lower than 10% or significantly reduce the brightness corresponding to 10%

Benefits:
1. Reduced heat generation ;
2. Extended screen lifespan ;
3. Lower ambient light at night ;
4. Reduced power consumption .

No file, test, or entry point is named. Start by locating the brightness-setting implementation and display-control entry point, then determine how the current 10% minimum is enforced. Done means providing a brightness level below 10% or materially reducing the brightness produced at 10%, with the behavior verified on the device.

Written by the indexing model from the issue text.