Ctrl+Alt+F1 (or + F2-F6) shows just a black black screen (on every monitor if there are any externals), although Ctrl+Alt+F7 may bring the desktop back. It's a Xubuntu 14.04.1 on MacBookPro11,3 with retina and nvidia graphics.
Since blank black screen happens a lot when plug/unplug external screens, and Ctrl+Alt+F1 or F2,3,4,5,6,7 etc. or Ctrl+Alt+Backspace does nothing, I can only power off if this situation happens.
Is this because the resolution stuff that stop ttys from displaying, maybe?
Update: if Nvidia driver uninstalled, tty works. When Nvidia driver installed again, blank tty again.
Update: I just reinstall Xubuntu again (not because of this issue), the system now is relatively fresh,Ctrl+Alt+F1 shows nothing (nvidia v 343 driver installed).