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[Lucazade <luca.forina@xxxxxxxxx>]

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https://bugs.launchpad.net/bugs/711172

Title:
  Brightness doesn't work using acpi from video driver

Status in Intel® Embedded Media and Graphics Driver (Intel® EMGD):
  Confirmed

Bug description:
  Brightness doesn't work using acpi from video driver with default
  kernel option "acpi_backlight=video"

  Using kernel option "acpi_backlight=vendor" this allow vendor acpi driver to control brightness hotkeys.
  reported to work with Dell Mini and Asus EEEPC (eeepc-wmi and dell_backlight modules) but this doens't work with acer-wmi.
  "ls /sys/class/backlight" shows these modules.

  Swithching off "acpi=off" fixes brightness issue but it is not
  recommended to disable acpi.

  The strange thing is that kernel 2.6.38 has a stub gpu module (called poulsbo) that should call "acpi_video_register()" and fix
   "acpi_backlight=video" for all vendors.. but unfortunately doesn't seem to work.