I tested with 
  GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

and not with

 GRUB_CMDLINE_LINUX=”acpi_backlight=vendor”

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[LUCID Beta 1] Brightness Fn keys don't work as expected on Sony Vaio VGN 
FW35G. Regression.
https://bugs.launchpad.net/bugs/546201
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