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After I installed xbacklight and edited /etc/X11/xorg.conf.d/20-video.conf to use Intel driver I can set brightness to lower values than before but keyboard hotkeys and power manager slider are not synchronized. Slider gives fine tuning while hotkeys even when set to only one bar is still very bright and can to higher brightness than slider when set to the max value. I'm using Xubuntu 18.04 on Dell Latitude E6510.

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