[Bug 546201] Re: [LUCID Beta 1] Brightness Fn keys don't work as expected on Sony Vaio VGN FW35G. Regression.

[Hendrik]

Bung:
> What if we have no file /etc/default/grub ?

That means that you use GRUB legacy instead of GRUB 2 as your boot manager. You probably started using Ubuntu before version 9.04 (which introduced GRUB 2, I think - or was it 9.10?) and subsequently upgraded to the newer versions.
The equivalent (more or less) file of /etc/default/grub would be /boot/grub/menu.lst for you. You could try making the respective changes there, but the format is different. For the fix proposed by progre55, add "acpi_backlight=vendor" (without the quotes) to the "kernel" line of your default boot option.

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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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