I'm also affected  by this on Ubuntu 12.10, a workaround is to set the
desired default backlight brightness by adding

# brightness fix after boot 
echo 0 > /sys/class/backlight/acpi_video0/brightness

before exit 0

in /etc/rc.local. 0 is the minimum, usually, 0-15 can be used.

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https://bugs.launchpad.net/bugs/1069186

Title:
  problem with backlight

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1069186/+subscriptions

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