Comment 11 for bug 372874

This bug is resolved upstream now.

http://cgit.freedesktop.org/~dkukawka/hal/commit/?id=d792a792846f9632edfdea3651a74fcd24b2ead7

Please update Jaunty version of HAL with this patch.
Brightness notifications on Thinkpads will to solved.

To enable brightness buttons they should be enabled in the thinkpad_acpi module:

options thinkpad_acpi hotkey=enable,0xfdffff