D19678: Feature: Add an option to adjust screen brightness by quadratic curve instead of linear when using brightness keys

[visha wa]

vishaw created this revision.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
vishaw requested review of this revision.

REVISION SUMMARY
  Add an option to make brightness up / brightness down key increase/decrease brightness along a quadratic curve instead of the usual linear curve.
  This allows much finer tuning at low brightness. Very useful in total darkness, when the smallest change in brightness makes huge difference.

TEST PLAN
  Tested on the latest git version of powerdevil.

REPOSITORY
  R122 Powerdevil

REVISION DETAIL
  https://phabricator.kde.org/D19678

AFFECTED FILES
  PowerDevilSettings.kcfg
  daemon/powerdevilbrightnesslogic.cpp
  kcmodule/global/GeneralPage.cpp
  kcmodule/global/generalPage.ui

To: vishaw
Cc: plasma-devel, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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