Comment 10 for bug 134756

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.