Same problem on Dell Studio 15 (1537), but the brightness keys did not
work properly in 9.04 either, though I noticed that if you tried to
adjust brightness before logging in, then they worked.
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[Karmic] Brightness fn keys lost functionality (multiple laptops)
https://bugs.launchpad.net/bugs/40
Last night the brightness keys worked correctly on my Dell Studio 15,
quite weird because I think no update was installed and no particular
actions were made before logging in... I'll try to check if the
bluetooth/wifi switch may somehow influence the behaviour of the
brightness keys, even if the t
