Comment 88 for bug 1348890

Vincent Gerris (vgerris) wrote :

I remembered someone writing a good article and found it:

For me this command shows events
sudo evemu-record /dev/input/event3

but not for my FN+F5, F6 or A combination.

According to his article, it should be filed as a kernel bug.

For everyone else, please check the article and see where your issue is and file the proper bug.
Good luck :)