On my laptop, an Elitebook 840, for unknown reasons (after a problem with xorg and an unplugged external screen actually), the Fn key does not behave anymore like a Fn key: I can't change anymore the brightness of the screen using it. Instead, the Fn key behaves like Ctrl+Left ! And the Ctrl-left key does not work anymore ! I would like to go back to the normal setting, Ctrl-left behaving like Ctrl+Left, and the Fn key like an Fn key. I guess that a configuration file is corrupted somewhere, but which one. Any help ? I use Gnome flashback Metacity.
EDIT (2015-04-20): Something new has happened today. I have plugged an external keyboard having a function key; the function key of the external keyboard works! And I have unplugged the external keyboard: now the Ctrl+left key of the laptop's keyboard behaves like the function key and the function key like the Ctrl+left key? Any idea?
compiz-config
and remap the keys.