I was recently reminded of one of the things I didn't like about nVidia cards & Linux. I've installed 3-4 of them over the years in different machines (different cards, driver versions), and every one of them did the same thing to me:
After installing the proprietary driver (the open-source is fine), the virtual consoles (1-6) no longer work. (The problem was mentioned in this question, but a permanent solution was not the asker's priority.)
Upon switching to a text console, the monitor(s) no longer receive a signal from the video card.* Pressing Ctrl-F7 brings back the X console.
*In my current configuration, 2 of the monitors shut down but the 3rd displays a text screen with
Ubuntu 15.04 . . . .
EDIT: sometimes the above message is replaced with an additional console message, like
[ 0.490534] ACPI PCC probe failed. starting version 219 _
Also interesting in the current setup is that when I switch back to #7, I usually get a dialog box "Authentication is required to update SMART data from...(/dev/sda) I'm only 90% sure this happened at the same time as the card & driver install.
I verified that /sbin/agetty processes are running for tty1-5.
Based on my own luck, I'd assume that it was a universal problem, but I sure haven't heard it discussed as if it were.
Any thoughts on how to get text consoles back without getting rid of nVidia's driver?