When typing Esc within an Emacs window under Unity (Emacs 23 standard package), the sound is turned on/off, but Emacs does not receive the key.
How can I change (probably) unity such that the Esc and also the other function keys are interpreted by Emacs?
A very crude workaround that always works in (GNU) Emacs is to use C+[ in place of Esc.
The question Why is the meta key is not working when using Emacs? does not apply because this was about using Emacs within a gnome-terminal, but I use Emacs directly under X.
Another option is to type Fn+Esc which produces Esc within Emacs and also works for the function keys; but I want the keys directly.
Edit: For some reasons that I cannot reproduce, Esc now works. It might be related to doing some