I cant control my laptop screen brightness with Fn+F5/F6 keys and also with Brightness control tool in settings. I tried to edit xorg.conf file but it didn't work (after restart my ubuntu didn't boot!) System info: Ubuntu 11.10; VAIO F133FXB with NVIDIA 425M graphic card (updated).



Try adding the following kernel options to your Grub defaults

gksudo gedit /etc/default/grub

Find the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and add the options

acpi_backlight=vendor acpi_osi=Linux

So the line looks like this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi_osi=Linux"

Then update grub and reboot

sudo update-grub
sudo reboot

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