I suspect that your problem is caused by the following change in the
acpi-support package in Ubuntu 9.10:

  * Drop events/video_brightness{down,up}, video_brightness{up,down}.sh: at
    least some platforms that use these ACPI sequences are seeing them
    correctly translated to input events, so those users will see duplicate
    events unless we drop them.  LP: #178860.

If this is the case, then fixing this for you will require a kernel
change.

-- 
brightness keys (Fn+F7 & Fn+F8) on Presario v3425au on hardy
https://bugs.launchpad.net/bugs/230421
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