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.

-- 
[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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