Hello, using laptop with intel and nvidia card . In the past
nouveau did not detect my card and I had no issues switching between graphics and text consoles. Now  it seems to be detecting the card and trugin to switch "Ctrl+Alt+F##" results it having current display just hang. If I go back to graphics console by "Alt+F1" then I can continue normal work.
This makes me thing that there is some confusion when trying to switch to text mode and I see last graphical screen. And I actually switch to console but can't see anything happening until I switch back to graphics.
update: after playing with some options, it turns out that on first boot there is no issue with switching to tty. After a few suspend/resume cycles and possibly related to docking/undocking the issue starts to manifest - as described above.
 GM108M/GeForce 940MX  kernel-core-4.8.15-200.fc24.x86_64