Comment 4 for bug 337945

I don't know if this is relevant but when I run:

# echo 255 > /sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness

I get permission denied. However, I can run:

# echo 255 | sudo tee -a /sys/class/leds/smc::kbd_backlight/brightness

..from the intrepid docs and it works flawlessly.