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

[visha wa]

vishaw updated this revision to Diff 53645.

CHANGES SINCE LAST UPDATE
  https://phabricator.kde.org/D19678?vs=53644&id=53645

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

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

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