Sorry, I was mistaken - everything is working fine!
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Invalid
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Backlight brightness not reduced when on battery power
https://bugs.launchpad.net/bugs/547015
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Bug
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/41966324/BootDmesg.txt
** Attachment added: "CurrentDmesg.txt"
http://launchpadlibrarian.net/41966325/CurrentDmesg.txt
** Attachment added: "Dependencies.txt"
http://launchpadlibrarian.net/41966326/Dependencies.txt
** A
