Please refer to the hotkeys/ troubleshooting page
https://wiki.ubuntu.com/Hotkeys/Troubleshooting

Also the following information would be helpful
-hal-find-by-capability --capability input | xargs -n1 lshal -u > lshal.log
-lshal |grep system.hardware
-dmesg > dmesg.log
-sudo lsinput > lsinput.log
-xkbcomp -xkb :0 - > xkbcomp.txt
-setxkbmap -print > xkbmap.txt

This update posted by the NY ubuntu Loco Group

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Several bugs after using laptop backlight keys 
https://bugs.launchpad.net/bugs/332553
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