Review Request 114807: Don't dim display if backlight brightness is already 0

[Alexander Mezin]

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https://git.reviewboard.kde.org/r/114807/
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Review request for kde-workspace and Dario Freddi.


Repository: kde-workspace


Description
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Some drivers report backlight brightness == 0 when display is switched off with DPMS (for example, Intel driver on my laptop).
If screen was switched off before dimming was started, it remembers 0 as previous backlight level. When I move mouse/press key, display doesn't switch on, because powerdevil sets brightness to 0.
This patch fixes the problem for me. It just doesn't change backlight brightness if it's already 0.


Diffs
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  powerdevil/daemon/actions/bundled/dimdisplay.h f917d71 
  powerdevil/daemon/actions/bundled/dimdisplay.cpp 39e0636 

Diff: https://git.reviewboard.kde.org/r/114807/diff/


Testing
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It works on my laptop.


Thanks,

Alexander Mezin

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