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.

-- 
[Jaunty] MacBook 5.1 keyboard backlight not supported
https://bugs.launchpad.net/bugs/337945
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