Having the same trouble with 12.04 LTS.  I didn't have any issue running
Maverick (10.10).  The screen brightness on my Toshiba L-300-D laptop
changes to full brightness with every reboot.  In order to resolve an
overheating problem I turn the acpi off at boot using "acpi_osi=" on the
linux line in grub.  When I check
/sys/class/back.ight/acpi_ideo0/brightness it shows 0 which is where I
want it.

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https://bugs.launchpad.net/bugs/35223

Title:
  Laptop TFT monitor - brightness level is not saved

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