have exactly the same problem on my HP 6830s: before in 9.10 the backlight 
controls
(fn-f7 / fn-f8) functioned properly - after upgrading to 10.04 not anymore

have no clue where to look

although the backlight went to fully bright after running the command
"gnome-power-manager"

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lucid extensa 5635z backlight dimming not working at all
https://bugs.launchpad.net/bugs/518002
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