I ever dislike the keyboards with lights, today after firmware update on my NS5x_NS7xPU the keyboard..become "with backlight". How to turn off? I have tried this command as root

sh -c "echo 0 > /sys/class/leds/system76_acpi::kbd_backlight/max_brightness"
sh: line 1: /sys/class/leds/system76_acpi::kbd_backlight/max_brightness: Permission denied

When I press fn+f7 it appear a "monitor configuration" of Xfce4

When I run this command

echo 0 > /sys/class/leds/system76_acpi\:\:kbd_backlight/brightness

the keyboard backlight is still on,

  • 1
    max_brightness is the maximum brightness that you could set. It's not the thing you set. Nov 1, 2023 at 16:41
  • Thanks cat /sys/class/leds/system76_acpi\:\:kbd_backlight/brightness report 0 but the lights are on
    – elbarna
    Nov 1, 2023 at 17:15

1 Answer 1


Solution found, waiting for controller by system i press two keyboard keys..


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