I have a similar (pehaps the same / related) problem:
The Fn+Up / Down keys do not change the volume.
Opening "Volume Control" and displaying all the options I found these keys are
now controling the "capture" ("Captura" in Portuguese) level, in the
"Recording" tab.
ACER Aspire 5102 WLMi
Ubuntu 8.1
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[kubuntu gutsy] keyboard volume control malfunction
https://bugs.launchpad.net/bugs/117060
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