you might want to have a look at
https://wiki.ubuntu.com/Hotkeys/Troubleshooting and attach the requested
files, that might be a hardware driver issue.
** Changed in: gnome-session (Ubuntu)
Importance: Undecided => Low
** Changed in: gnome-session (Ubuntu)
Status: New => Incomplete
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brightness key control lost
https://bugs.launchpad.net/bugs/567814
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