If you upgraded, you hould still have some older kernels installed. If
you boot and press "esc" you get into the boot menu ("grub") where you
can select older kernels. Start with 2.6.27-something, which is the
Ubuntu 8.10 Linux kernel, check if it works again, and if so, please
work your way upwards to the latest Jaunty kernel and check where it
breaks.

If even the Intrepid kernel does not work any more, then it is a
regression in a different component. In this case, can you please check
https://wiki.ubuntu.com/Hotkeys/Troubleshooting whether the brightness
keys produce a proper keyboard event? (you should see it in "xev"
already).

** Changed in: hal-info (Ubuntu)
     Assignee: (unassigned) => Martin Pitt (pitti)
       Status: New => Incomplete

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[Jaunty] Brightness to minimum, cannot change (Lenovo 3000 C200)
https://bugs.launchpad.net/bugs/317640
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