I can confirm this bug on a Dell Inspiron 6000 laptop running Jaunty.
After adjusting the screen brightness using Fn+Up or Fn+Down, I am no
longer able to use the keyboard until switching to a TTY and then back
to X.
** Changed in: gnome-power-manager (Ubuntu)
Importance: Undecided => Medium
Status: New => Triaged
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Partial keyboard and touchpad failure in X after changing screen brightness
https://bugs.launchpad.net/bugs/301351
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