This patch adds mic mute keycode support for the Lenovo Thinkpad USB keyboard. Support for this keycode was introduced upstream, and will be defined in upcoming 3.1 Linux Kernel input.h header: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=33009557bd Signed-off-by: Martin Pitt <martin.pitt@ubuntu.com>