I've recently installed Kubuntu 16.04 (and am up-to-date). My machine has on-CPU graphics (Intel) and a discrete graphics card (GeForce GTX 650 Ti). I only use the on-board graphics for the display, the card is not connected to any monitor. I'm not sure this hardware setup is meaningful, but defined it none the less.
I have an X session in progress (or the login screen), but I want to use another VT, so I switch with Ctrl+Alt+Fn (say with n = 3). I see the login prompt, but typing does not have any effect. I can switch back to the X session. Why is that?
Note: I see
tty6 regardless of which VT I try to switch to.