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I have a laptop which has a Fn key. Using xev command shows that Fn + UpArrow is affected to XF86AudioRaiseVolume.

If I use KDE, is it KDE that is responsible for affecting a behaviour to that symbol?

I have Arch linux installed with openbox and this key (and other Fn + ...) does not work.

On Ubuntu + KDE, it works.

I was wondering if it was my responsability to configure Openbox in Arch linux to provide those keys with a behaviour.

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Yes, Gnome and KDE provide some of their own keyboard shortcuts in addition to the ones provided by their respective WMs.

However, this may not mean what you think. The fact that Fn + UpArrow produces the keysym XF86AudioRaiseVolume is mainly due to your laptop's keyboard. You can verify this by using xev again (in the Openbox environment); It should have the same output when you press Fn + UpArrow.

In Openbox, what is different is that there is not a binding setup for XF86AudioRaiseVolume, so nothing happens when that virtual 'key' is pressed: The keysym is sent, Openbox isn't interested in it, so nothing happens.

You may want to look into adding your own bindings with xbindkeys (see http://www.nongnu.org/xbindkeys/ ). There's a good article on the wiki about it. The program you want to bind to may be amixer (if you're using ALSA), and / or pactl (if you're using PulseAudio).

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