Public bug reported:

Recently upgraded from 10.10 to 12.04.  After an idle period where the
backlight correctly turns off the backlight of my Toshiba L-300-D laptop
the backlight comes on but when I move the mouse or press a key however
the screen remains dimmed (grayed out) and stays that way for up to a
minute before the screen reappears.  To ensure fan control works I boot
with " acpi_osi= " in the linux grub line.  The screen used to
immediately undim and let me see the screen.

lsb_release -rd
Description:    Ubuntu 12.04 LTS
Release:        12.04
3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 UTC 2012 i686 athlon 
i386 GNU/Linux

** Affects: acpi (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/996937

Title:
  Laptop screen remains dimmed after idle

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