Comment 226 for bug 95444

Icapa try this comments:

https://bugs.launchpad.net/ubuntu/+source/hotkey-setup/+bug/95444/comments/161
https://bugs.launchpad.net/ubuntu/+source/hotkey-setup/+bug/95444/comments/164

On it's it have a little scripts for change files, but is possible that your model of laptop are not included on /usr/share/hal/fdi/information/10freedesktop/10-sony-laptop-panel-mgmt-policy.fdi, it your isn't on list add your model, like this:
        <match key="/org/freedesktop/Hal/devices/computer:system.hardware.product" string="VGN-FZ38M">
          <merge key="laptop_panel.num_levels" type="int">20</merge>
          <merge key="laptop_panel.access_method" type="string">sony-nvidia</merge>
        </match>

Changing VGN-FZ38M for your model. It's the one thing that I can help you.