Public bug reported:

I have a Dell Inspiron 1200 with Xubuntu 8.10 installed. All updates
installed.

When I use the keyboard function keys to change the screen brightness
(Fn+up/down) GTK? freezes. Windows do not function properly neither do
the menus. I have to kill X to fix the problem.

Steps to reproduce:
1. Have Dell Inspiron 1200 with Xubuntu 8.10 installed. All updates installed.
2. Log into graphical environment XFCE.
3. On the keyboard hit Fn+Arrowup/Arrowdown to change screen brightness.
4. See XFCE freeze, basically becoming useless.
5. Kill X to start fresh.

Expected outcome:
Use Fn key combo to change screen brightness without causing failures in other 
system components or software.

Side Note: Fn key combo for audio volume up/down does not cause
problems. Although using Fn combo for audio does not show a graphical
representation on screen as the screen brightness key combo does.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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Using Fn+arrow keys to change screen brightness causes gtk to fail
https://bugs.launchpad.net/bugs/298278
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