Comment 3 for bug 493678

Christopher,

If you can bring up the Input Devices dialog, can you navigate it with your keyboard (Tab to move fields, Arrows to change options, Spacebar to activate items)?

If it shows no devices in the dialog, please make sure your shortcuts for Inkscape have the same values as mentioned in this comment, then launch from your updated shortcut and try again:
https://bugs.edge.launchpad.net/inkscape/+bug/490448/comments/5