Where available, it is possible to set the
appropriate multimedia keys
to perform their intended functions, such as to control the volume and/or the screen brightness. These will usually be integrated into the function keys, and are identified by their appropriate symbols. See Extra keyboard keys for details.
The volume and brightness multimedia codes are as follows (note that commands will still have to be assigned to them to actually function):
XF86AudioRaiseVolume: Increase volume
XF86AudioLowerVolume: Decrease volume
XF86AudioMute: Mute / unmute volume
XF86MonBrightnessUp: Increase screen brightness
XF86MonBrightnessDown: Decrease screen brightness
For a full list of XF86 multimedia keys, see LQWiki:XF86 keyboard symbols.