I have the same problem with portege Z930 with quantal (amd64).  A
workaround is to do as root

cd /sys/class/backlight/intel_backlight
echo  some_value > brightness

with some_value an integer lower than 4539.

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https://bugs.launchpad.net/bugs/935778

Title:
  Various Toshiba laptops - brightness controls work on first boot, but
  do nothing after suspend/resume to RAM.

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