if i add GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Windows" on grub the 
grightness will start on midle (50%)
then if i plug or un plug the prowe source it will go 100%

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https://bugs.launchpad.net/bugs/1380824

Title:
  Backlight not working on Samsung ATIV 8 laptop

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