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Laggy response of brightness control keys

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https://bbs.archlinux.org – Hello everybody,I have a Vaio S13 laptop with a Nvidia 310M graphics card. For some time now I have been having a recurring problem with the brightness controls. Besides the need to edit /etc/X11/xorg.conf and adding EnableBrightnessControl=1 to enable brightness control keys, sometimes (completely sporadically, still trying to find a way to reproduce it) brightness controls are very laggy and unresposive (needs 2 or more key strokes to respond). This really gets on my nerves as it is difficult to get a specific brightness level.As I said, I still have not found when exactly does this happens (HowTos)