Comment 7 for bug 764195

I had a similar problem. GRUB configuration change didn't work. Adding stuff to xorg.conf neither. But I managed to "fix" it using a Python program that binds to D-Bus signal BrightnessChanged and sets the proper brightness using nvclock command. Check this out at my blog: http://piotr.gabryjeluk.pl/dev:ubuntu-11-04-natty-on-sony-vaio-sz640