Please check if this helps you --
https://wiki.ubuntu.com/Hotkeys/Troubleshooting
If not, then please provide some more informations.
1. What brand and model is your keyboard.
How is your keyboard connected to your PC: DIN, PS/2, USB, bluetooth, etc.
2. For a USB keyboard, enter the following command in a terminal:
lsusb -v > ~/lsusb-v
Attach as separate attachment to your bug report ~/lsusb-v.
3. Open a terminal/console and enter the following commands:
xprop -root | grep XKB > ~/xkb
gconftool-2 -R /desktop/gnome/peripherals/keyboard/kbd > ~/gconf
Attach as separate attachments to your bug report ~/xkb and ~/gconf.
Check the hotkey debugging article for any more relevant information to
provide.
** Package changed: ubuntu => gnome-settings-daemon (Ubuntu)
** Changed in: gnome-settings-daemon (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1030568
Title:
Fn+F3 in dell studio 1555 doesn't disable charging
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