Bug#651741: gnome-power-manager: display backlight brightness has no effect on Sony Vaio VPCYA1V9E

[littlebat]

Added "acpi_backlight=vendor acpi_osi=linux video.brightness_switch_enabled=1"
into grub boot kernel parameters, "Fn + Up/Down" to change brigtness works on
my G360. It's no need to write a Udev rules like my previous method.