I probably had the same problem. I have a Dell Mini 9 and the brightness
keys worked fine in Intrepid, but bounce around uselessly in Jaunty (I'm
using the Release build). A BIOS update fixed my problem (got the idea
from drizek's comment in bug #337731). I bought my Mini (new!) five
months ago, yet it had BIOS A01. This problem nicely evaporated after
flashing it to the current A05.

You'll need a Windows box to create a bootable flash drive using Dell's
BIOS update utility. See
http://en.community.dell.com/wikis/linux/dell-i910-mini-vostro-a90-usb-
key-drive-flashbios-utility.aspx .

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Brightness down key doesn't work properly on dell mini (Jaunty Beta)
https://bugs.launchpad.net/bugs/355546
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