Update thinkpad_x220.md

wiki/linux/arch-linux/thinkpad_x220.md

@@ -67,3 +67,18 @@ Scripts to change configuration at docking/undocking
 
 - For the docked configuration use `vim /etc/dockd/dock.hook`
 - For the undocked configuration use `vim /etc/dockd/undock.hook`
+
+## FN keys not working
+
+If the fn keys are not working properly run 
+[a script](https://github.com/tiyn/dotfiles/blob/master/.local/bin/etc/fchange)
+that changes the `sys/module/hid_apple/parameters/fnmode` file.
+This toggles between the two different fn key functions.
+
+## Toggle the touchpad
+
+To toggle the touchpad on or off 
+[a simple script](https://github.com/tiyn/dotfiles/blob/master/.local/bin/tools/dwm/toggletouchpad)
+can be used that uses `synclient TouchpadOff=1` or `synclient TouchpadOff=0`.
+This requires `xf86-input-synaptics` which is a synaptics driver for 
+notebook touchpads.