Try modifying /etc/default/grub changing the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
Then run sudo update-grub
If it doesn't work try changing the same line to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" and update-grub again.
Source: http://askubuntu.com/questions/230929/controlling-brightness-in-sony-vaio-sve151a11w-not-working
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