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- /etc/udev/rules.d/backlight.rules
- ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="backlight", RUN+="/bin/chgrp video /sys/class/backlight/%k/brightness"
- ACTION=="add", SUBSYSTEM=="backlight", KERNEL=="backlight", RUN+="/bin/chmod g+w /sys/class/backlight/%k/brightness"
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