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HP kde backlight nvidia 313.18

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https://bbs.archlinux.org – Hi, i have an elitebook 8560w. Under gnome the backlight seemed to work fine. In kde the function keys made the popup to appear, but the backlight was not changed. After latest updates even the popup does not show up.I've tried echoing into /sys/class/backlight/acpi_video0/brightness and it workedI tried also the solutions from this thread: https://bbs.archlinux.org/viewtopic.php?id=1511191. enabling brightness control in device section in /etc/X11/xorg.conf.d/20-nvidia.conf - no change in behaviour2. change acpi_backlight to vendor - even the /sys/class/backlight/ is empty.In the thread (HowTos)