The similar K810 works brilliantly in Linux. Mario Scholz has written a small tool to switch between media and function keys[1], I wouldn't be surprised if it w

The similar K810 works brilliantly in Linux. Mario Scholz has written a small tool to switch between media and function keys[1], I wouldn't be surprised if it works for K840 too. [1] http://www.trial-n-error.de/posts/2012/12/31/logitech-k810-keyboard-configurator/ http://www.trial-n-error.de/posts/2012/12/31/logitech-k810-k...