I recently updated to 17.10 from 17.04 and now I have no way to disable the touchpad on my laptop. When I do Fn + F9 (in my case), I see the touchpad logo in the screen as it where disabled, but is not.
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I had the same problem on my Asus X555UB, but I use the command
synclient TouchpadOff=1 in @Legolas script. This works for me.
I am not sure why they key is not working for your laptop. But I can suggest a general alternative.
Put the following code in a file, such as
#!/bin/bash STATUS=`gsettings get org.gnome.desktop.peripherals.touchpad send-events` if [ "$STATUS" = "'enabled'" ] then gsettings set org.gnome.desktop.peripherals.touchpad send-events 'disabled' else gsettings set org.gnome.desktop.peripherals.touchpad send-events 'enabled' fi
Grant the file executable permission:
chmod +x touchpad_toggle.sh
Add a keyboard shortcut to the file from Settings → Devices → Keyboard.