To add some information for those look into this bug... The backlight is 
enabled by the applesmc module. The "mactel packages" being referred to are 
some PPA packages that are available for some intel Mac users. Details here:
https://edge.launchpad.net/~mactel-support/+archive/ppa

** Also affects: linux
   Importance: Undecided
       Status: New

** Also affects: hal
   Importance: Undecided
       Status: New

-- 
[Jaunty] Screen brightness adjustment sluggish
https://bugs.launchpad.net/bugs/357112
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 The Linux Kernel: New
Status in Mactel Support: New

Bug description:
In Ubuntu 9.04 (Jaunty), compared to Ubuntu 8.10 (Intrepid), screen brightness 
adjustment feels quite sluggish. The increments are very small, the time 
between each adjustment is a bit too long, and there's no acceleration (e.g., 
consistently holding down the screen dim/brighten button doesn't adjust more 
rapidly the longer it's held).

NOTE: This may not be Mactel specific (e.g., it could be the new GNOME 
behavior), but I'm reporting it here since I can not verify for other hardware, 
and am using the Mactel drivers for screen brightness adjustment.

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