It came with the kernel update.
2013/2/11 Chris Wilson
> Why was acpi_backlight=vendor on your command line?
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1104529
>
> Title:
> Screen brightness does not work prope
Public bug reported:
Neither the brighness keys nor the system settings diaglog allowed me to
change the screen brightness on my samsung chronos 7;
only after removing " acpi_backlight=vendor" from grub it worked
flawlessly.
reported on samsung np700z on 13.04 (testing), all current updates
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