Here is a really ugly hack that lets HAL/G-P-M work with the odd
brightness levels mentioned. There is a README inside the tarball. You
have to hard code the legal brightness levels in an FDI file and add
some sh script to some HAL scripts. It only works for devices that use
the sysfs interface to set brightness but could easily be adapted.

The tarball is named with Gateway, etc but can work with any computer
with this issue.

** Attachment added: "scripts and FDI file for hacked fix"
   
http://launchpadlibrarian.net/10347942/Gateway-MP8709-stepped-brightness.tar.gz

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LCD backlight turns off when between discrete levels, both from hotkeys and 
from dim-on-idle.
https://bugs.launchpad.net/bugs/121833
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