Comment 2 for bug 308784

please download the latest pmtools at
http://www.lesswatts.org/projects/acpi/utilities.php
make, and run "./acpidump > acpidump.log"
and attach the acpidump.log here.

In Gnome, please make sure if you can change the backlight by
poking the "/sys/class/backlight/*/brightness"