Automatic Brightness in Plasma

3 days ago

Plasma 6.6 introduces automatic brightness control, accessible in display settings.
Hardware limitations exist as most laptops and monitors lack accessible brightness sensors, though the Framework Laptop 13 includes one.
Initial linear brightness scaling proved inadequate due to non-linear display luminance curves and user configuration challenges.
The solution stores six sensor values at 20% brightness intervals, using linear interpolation to determine brightness settings.
User adjustments to brightness update the curve, enforcing monotonicity and minimum differences between control points to avoid issues like constant 100% brightness.
Improvements include hysteresis, a time delay before changes, and slower animations for reducing brightness to minimize fluctuations.
Future enhancements may involve adjusting the display's white point based on environmental sensors, potentially using camera modules.

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