This problem can be fixed in Thinkpads by doing the following. I am
using an IBM T40 with Gusty by the way.

1. In the file '/etc/modprobe.d/thinkpad_acpi.modprobe' change 'options
thinkpad_acpi hotkey=enable,0xffff8f experimental=1' to 'options
thinkpad_acpi hotkey=enable,0xffff experimental=1 fan_control=1'

2. In the file '/etc/modules' add this line 'thinkpad_acpi
hotkey=enable,0xffff experimental=1 fan_control=1'

After these changes, the brightness applet should work, there is also a
display on the screen whenever the brightness level is changed, and you
should also be able to see the brightness sliders in gnome-power-manager
that works.

-- 
[Gutsy]Brightness applet not working in Gutsy (worked in Feisty)
https://bugs.launchpad.net/bugs/134756
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