Perhaps it's not a KDE problem. When I debug PowerDevilDaemon, this test is
always false (line 765 PowerDevilDaemon.cpp) :
if ((currentBrightness == d->cachedBrightness) && !d->brightnessInHardware)
because value of currentBrightness changes before this method when I use
Fn+key (by HAL or Kernel ?) but brightness on my laptop don't change.
For example, when I use "Decrease Screen Brightness" key (Fn+key):
d->brightnessInHardware = false
currentBrightness=77
d->cachedBrightness=88
This patch solves problem for my laptop with KDE (this is a workaround).
** Attachment added: "PowerDevilDaemon.cpp.diff"
http://launchpadlibrarian.net/35370036/PowerDevilDaemon.cpp.diff
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When I use Fn+key increase/decrease brightness, Powerdevil brightness OSD is
displayed but brightness doesn't change
https://bugs.launchpad.net/bugs/477828
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