with solution 3 every time you suspend or hibernatethe computer  video is off 
on waking.
I have solved adding this script (make it executable) in "/etc/pm/00_video" :

#!/bin/bash
case "$1" in
    hibernate|suspend)
        ;;
    thaw|resume)
        setpci -s 00:02.0 F4.B=00
        ;;
    *)
        ;;
esac
exit $?

every time computer wakes up from suspension or hibernation LCD will turn 
ALIVE!!!!!
tux racing still darken everything, but Macubuntu goes smoothly

bye

Ale

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https://bugs.launchpad.net/bugs/740893

Title:
  Kernel 2.6.38-7 completely dims screen on Intel GMA 4500M

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