Animate screen brightness change

Review Request #121995 - Created Jan. 11, 2015 and submitted - Latest diff uploaded

Information
Kai Uwe Broulik
powerdevil
master
Reviewers
solid

Use a QPropertyAnimation to animate screen brightness changes, if supported by your configuration (enough steps available).

Using Kernel 3.18 it now reports ~900 steps for my display and so when idle the screen dims smoothly, when changing brightness or using the brightness keys, the screen brightness changes smoothly with the OSD reporting the proper value and battery monitor sliders adjusting slightly delayed. Didn't test using the helper rather than XRandr.

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