I can still reproduce it... basically, at boot, Ctr+Alt+Fn do nothing (behaviour steps 1 and 2 in #3). However, once you start a user's X session the shortcut "activates"... if an X session is open, things go as well (step 4). However, if such a session is closed, the shortcut is still active (and the virtual console recognises keyboard commands) but the screen does not show it (steps 6 to 8).
I am on Intel graphics (xps13 i7-4500U HD4400).
I can still reproduce it... basically, at boot, Ctr+Alt+Fn do nothing (behaviour steps 1 and 2 in #3). However, once you start a user's X session the shortcut "activates"... if an X session is open, things go as well (step 4). However, if such a session is closed, the shortcut is still active (and the virtual console recognises keyboard commands) but the screen does not show it (steps 6 to 8).