Thanks for testing. So there was no difference between Karmic and
Jaunty's performance? It's still best to do debugging in Karmic since
the developers would be able to get fixes into the development release.

There are some additional debugging steps we can do to identify this problem.
First, follow the Troubleshooting instructions at:
https://wiki.ubuntu.com/Hotkeys/Troubleshooting

If it confirms that the bug is not in the kernel's handling of the hotkeys, 
then we can use:
https://wiki.ubuntu.com/DebuggingGNOMEPowerManager
specifically the command:
1) dbus-monitor --session 
"type='signal',interface='org.freedesktop.PowerManagement.Backlight'"
2) change brightness with hotkeys
3) report the output here

and the commands:
1) type the following into the terminal:
killall gnome-power-manager
gnome-power-manager --verbose --no-daemon
2) change the brightness hotkeys
3) report the output here

-- 
display brightness asus; function keys not working
https://bugs.launchpad.net/bugs/368506
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