On my Ubuntu install on my MacBook Pro 9,1 (late or early 2012, IIRC), the graphical mode works fine. However, when I switch to a tty (Ctrl+Alt+F1-through-F6), the screen seems to completely turn off (not even the backlight stays on). I can return to the graphical mode, but the area where the dock usually resides shows random gibberish until I reveal the dock (I have it set to auto-hide).
I am using the nvidia proprietary drivers, with the Intel HD integrated GPU disabled and it's kernel module blacklisted (this machine has hybrid graphics).
When I use Ubuntu's recovery mode, I can see the text-only interface. If I select FailsafeX, then switching to a tty once I see the limited graphics mode dialogue pop up doesn't work.
I have tried the answer from: "Why does switching to the tty give me a blank screen?", and tried booting with
nomodeset, but the issue remains.