thanks to Felix Geyer for the patch.

this didn't work right aways since my system is a MSI U120.

here's what I did.. (no need to patch anything)

I created a file in /etc/hal/fdi/information/msi-backlight-fix.fdi

with this content

<?xml version="1.0" encoding="UTF-8"?> <!-- -*- SGML -*- -->
<deviceinfo version="0.2">
  <device>
    <match key="info.category" string="laptop_panel">
      <match key="/org/freedesktop/Hal/devices/computer:system.board.vendor" 
prefix_ncase="micro-star">
        <match key="/org/freedesktop/Hal/devices/computer:system.board.product" 
contains_outof="U100;U-100"
          <merge key="laptop_panel.brightness_in_hardware" 
type="bool">true</merge>
          <remove key="info.addons" 
type="strlist">hald-addon-generic-backlight</remove>
                </match>
      </match>
    </match>    
  </device>     
</deviceinfo>

then restarted the hal service (backlight works great)
I changed hardware for board make it more generic.

-- 
brightness is broken on MSI WIND U100
https://bugs.launchpad.net/bugs/415023
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