LXDEvolumekeymapping

Create LXDE Fn Key Shortcut for Volume on Archlinux

By default, if you using LXDE desktop environment, you can brightness/volume up or down using Fn + Key. To make
these key work on LXDE you must edit some file.

Open File Manager , show hidden files.
open .config/openbox/lxde-rc.xml with text editor.



Then add this code before </keyboard> line:

<keybind key="XF86AudioRaiseVolume">
      <action name="Execute">
        <command>amixer set Master 5%+ unmute</command>
      </action>
    </keybind>
<keybind key="XF86AudioLowerVolume">
      <action name="Execute">
        <command>amixer set Master 5%- unmute</command>
      </action>
    </keybind>
<keybind key="XF86MonBrightnessDown">
      <action name="Execute">
        <command>xbacklight -20</command>
        <startupnotify>
          <enabled>yes</enabled>
          <name>Decrease screen brightness</name>
        </startupnotify>
      </action>
    </keybind>
<keybind key="XF86MonBrightnessUp">
      <action name="Execute">
        <command>xbacklight +20</command>
        <startupnotify>
          <enabled>yes</enabled>
          <name>Increase screen brightness</name>
        </startupnotify>
      </action>
    </keybind>

Save, logout, and login again, then test it out.