After more searching regarding this same issue seen in Intrepid it seems there 
was a gnome-power-manager provided in the PPA to help address light-sensor 
readings adjusting the brightness of keyboard backlight.  
I've also tried mucking around in this file 
/usr/share/hal/fdi/information/10freedesktop/10-applesmc.fdi
and this one /usr/share/hal/fdi/policy/10osvendor/10-macbookpro-utils.fdi

but didn't successfully accomplish anything.  These seem to be the main
2 involved though.

-- 
[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.

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