{pkgs, ...}: { services.udev.extraRules = '' SUBSYSTEM=="usb", MODE="0666" SUBSYSTEM=="leds", KERNEL=="rgb:kbd_backlight*", ACTION=="add", RUN+="${pkgs.coreutils}/bin/chmod a+w /sys/class/leds/%k/multi_intensity" ''; environment.systemPackages = with pkgs; [ zsa-udev-rules ]; }