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["P. Dunbar" <drsilk@xxxxxxxxx>]

I usually sudo -i first then I run the command and you don't get permission denied. 
You could also run it the same way as
echo 255 | sudo tee -a /sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness

Both work, I like your path better cause its shorter.

-- 
[Jaunty] MacBook 5.1 keyboard backlight not supported
https://bugs.launchpad.net/bugs/337945
You received this bug notification because you are a member of Mactel
Support, which is the registrant for Mactel Support.

Status in Hardware Abstraction Layer (HAL): New
Status in Mactel Support: New
Status in “linux” source package in Ubuntu: New

Bug description:
The keyboard backlight on the MacBook 5.1 is not supported as of Jaunty (Ubuntu 9.04) Alpha 5. This is supported in Intrepid (Ubuntu 8.10) by the Mactel PPA packages hal-applesmc, hid-dkms, and possibly nvidia-bl-dkms, though I installed the nvidia-bl-dkms package for Jaunty.